| Names | |
|---|---|
| Preferred IUPAC name | Lead(II) chromate |
| Other names | C.I. Pigment Yellow 34 Lead Chromate Pigment Yellow 34 |
| Pronunciation | /ˈkrəʊm ˈjɛl.oʊ/ |
| Identifiers | |
| CAS Number | 1344-37-2 |
| Beilstein Reference | 3586687 |
| ChEBI | CHEBI:53344 |
| ChEMBL | CHEMBL636059 |
| ChemSpider | 21559698 |
| DrugBank | DB11176 |
| ECHA InfoCard | 100.029.185 |
| EC Number | 231-846-0 |
| Gmelin Reference | Gmelin 13736 |
| KEGG | C09962 |
| MeSH | D002818 |
| PubChem CID | 24403 |
| RTECS number | GL0350000 |
| UNII | 7Z6X2W3W8D |
| UN number | UN3077 |
| Properties | |
| Chemical formula | PbCrO4 |
| Molar mass | 323.16 g/mol |
| Appearance | Bright, opaque, yellow powder |
| Odor | Odorless |
| Density | 4.2 g/cm³ |
| Solubility in water | Insoluble |
| log P | 1.82 |
| Acidity (pKa) | 5.1 |
| Magnetic susceptibility (χ) | '-0.36 x 10⁻⁶ cgs' |
| Refractive index (nD) | 1.98 |
| Viscosity | Viscous paste |
| Dipole moment | 1.84 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | '332.7 J·mol⁻¹·K⁻¹' |
| Std enthalpy of formation (ΔfH⦵298) | -375.2 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -808 kJ/mol |
| Pharmacology | |
| ATC code | V09AA04 |
| Hazards | |
| Main hazards | Toxic by inhalation, ingestion, and skin contact; may cause cancer; environmental hazard. |
| GHS labelling | GHS02, GHS06, GHS08 |
| Signal word | Danger |
| Hazard statements | H301 + H331: Toxic if swallowed or if inhaled. H350: May cause cancer. H360Df: May damage the unborn child. Suspected of damaging fertility. H372: Causes damage to organs through prolonged or repeated exposure. H400: Very toxic to aquatic life. |
| Precautionary statements | P201, P202, P261, P264, P270, P272, P273, P280, P301+P310, P302+P352, P304+P340, P308+P313, P312, P321, P330, P362+P364, P391, P405, P501 |
| NFPA 704 (fire diamond) | 2-3-0-OX |
| Flash point | > 79°C (174°F) |
| Lethal dose or concentration | LD50 (oral, rat): 10 mg/kg |
| LD50 (median dose) | LD50: Oral-rat 45 mg/kg |
| NIOSH | 1315 |
| PEL (Permissible) | 50 µg/m³ |
| REL (Recommended) | PY3 |
| IDLH (Immediate danger) | 1 mg Cr(VI)/m³ |
| Related compounds | |
| Related compounds | Lead(II) sulfate Lead(II) oxide Cadmium yellow |
| Attribute | Description | Technical Commentary |
|---|---|---|
| Product Name | Chrome Yellow | The name Chrome Yellow is standard in pigment manufacturing, referencing the distinct yellow pigment based on lead chromate. Manufacturers keep naming conventions aligned to ensure downstream users can properly identify pigment classes. |
| IUPAC Name | Lead(II) chromate | Industry-grade material is typically registered as lead(II) chromate. This matches official reporting and regulatory submissions, reducing ambiguity in chemical inventories and documentation trails. |
| Chemical Formula | PbCrO4 | The formula describes a simple binary salt. In factory production, compositional variations can result in co-precipitated phases or varying degrees of particle coating, particularly for customized grade requirements. |
| Synonyms & Trade Names | Chrome Yellow, Pigment Yellow 34, C.I. 77603 | On technical paperwork and container labels, the synonyms Chrome Yellow and Pigment Yellow 34 are commonly printed. Trade names may vary depending on proprietary blends, particle engineering, or color modification practices. Manufacturer-issued trade formulations sometimes contain stabilizing agents or surface treatments to tune tinting strength or weather stability. |
| CAS Number | 1344-37-2 | This CAS identifier is used for compliance tracking, regulatory declarations, and supply chain risk management. Labs use the CAS number to unambiguously match LIMS records with incoming raw material lots and finished batch lots. |
| HS Code & Customs Classification | 3206.19 | The Harmonized System code falls under “Other Colouring Matter; Preparations,” specifically for inorganic pigments. During international shipping and customs clearance, declaration of this code affects tariff assessments, special regulatory controls, and screening for hazardous goods procedures. Impurities, stabilizer addition, and pigment granulation format can impact whether a consignment is classified with this exact code or a related pigment code. |
Chrome Yellow originates from controlled precipitation using lead salts and chromate sources. Each grade dictates purity levels, particle size, and processing requirements. Customers in coatings, plastics, and printing seek tailored dispersibility, heat resistance, and hiding power—these properties shift with pigment grind, surface treatment additives, and bulk density targets set during the milling and calcination stages.
The industrial batch route, whether continuous or batchwise, depends on raw material availability, wastewater treatment capabilities, and handling of lead-bearing byproducts. Making Chrome Yellow involves scrutiny at each filter cake washing and drying cycle to minimize soluble lead carryover and control chromate decomposition. Waste management and product stabilization steps vary by local health regulations and export region; worker hygiene protections and pigment encapsulation are increasingly emphasized to address occupational exposure.
Shipping under HS 3206.19 demands transparent impurity disclosure and documentation consistent with REACH or TSCA if shipping to Europe or the US. Customs authorities regularly update pigment-related risk status, so documentation must trace lot genealogy and production history. Specialist blending lines, often required for food contact or children’s product applications, require further process segregation and in-line QC to detect and prevent cross-contamination.
Industrial Chrome Yellow appears as a fine crystalline powder. Color usually ranges from bright lemon yellow to deep orange-yellow, influenced by particle size and lead chromate content. Purity, grading, and modifier salts affect both hue and brightness. Chrome Yellow does not display a distinct odor.
Melting and boiling points are not directly measured for pigment use, as decomposition occurs before melting. Decomposition can produce toxic chromium and lead fumes at high temperatures, an important consideration during thermal processing or accidental overheating.
Bulk density and true density values largely depend on crystal morphology, degree of hydration, and milling method. Particle size distribution controls pigment dispersion in paint, plastic, and ink formulations; fine grades behave differently under shear and liquid mixing compared to coarse types.
In production and application, Chrome Yellow remains chemically stable under dry ambient conditions but shows sensitivity to strong acids, alkalis, and reducing agents. Contact with sulfides or hydrogen sulfide can darken pigment due to lead sulfide formation. Reducing environments diminish color intensity by converting chromate ions.
Chrome Yellow is practically insoluble in water and most organic solvents. Minimal solubility in dilute acids and alkalis restricts pigment bleeding in most application environments, a vital trait for coating and plastics producers. Preparation of stable dispersions demands optimized wetting agents and controlled milling to avoid pigment aggregation.
Specification values differ per grade—standard, modified, and high-durability types exist for paints, plastics, and printing inks. Grades define acceptable ranges for chromate and lead content, hiding power, tinting strength, oil absorption, particle size, and colorimetric values. Technical customers often request enhanced purity and tighter particle distribution for sensitive applications.
Main impurities include water-soluble salts, trace metals, and unreacted raw materials. Sulfates, chlorides, and other anions originate from starting material purity and batch washing efficiency. Internal limits are set by process capability and end-use safety; established impurity thresholds reflect both regulatory standards and client-requested ceilings.
Companies apply test protocols aligned with national and international norms where possible; actual methods adjust to customer specs or local environmental requirements. Key quality checks target color parameters using colorimeters, particle size using laser diffraction, oil absorption by ASTM rub-out, and soluble salts by volumetric titration. Final release relies on a combination of batch analysis and performance testing against agreed-upon specification sheets.
Raw materials include basic lead salts, sodium or potassium chromate, and process water. Sourcing prioritizes material consistency, contaminant profile, and supplier reliability. In some regional markets, local regulatory restrictions impact allowed lead or chrome sourcing routes.
Traditional synthesis involves double decomposition of lead nitrate with sodium chromate under controlled agitation and temperature. Reaction pH adjustment and salt addition allow for property tuning—addition of sulfate stabilizers or modifying cations can alter shade and weather resistance. Use of closed reactors reduces worker exposure and ensures emission compliance.
Effective washing removes soluble impurities and unreacted reagents. Continuous monitoring of filtrate conductivity and periodic spot-checks for residual salts help minimize off-spec product. Specialized filtration and post-synthesis chemical treatments achieve low impurity residues required for demanding applications.
Every batch undergoes testing for color depth, coverage, dispersion stability, and critical impurities. Long-term trend monitoring ensures consistent performance and rapid identification of drift in process yield or off-target impurity spikes. Final release follows both internal technical criteria and customer quality agreements.
Chrome Yellow exhibits sensitivity to reducing agents, which reduce chromate (CrO42-) to less oxidized chromium species, leading to pigment darkening. On exposure to sulfide ions, the pigment forms black lead sulfide, negatively affecting brightness.
Reactions altering pigment structure typically involve contact with strong acids or bases at elevated temperatures or prolonged exposure to sulfides. Ordinary atmospheric conditions do not provoke major degradation if pigment remains dry and sealed from process gases.
By coupling Chrome Yellow with additional chromate salts or co-precipitating with other metal ions, manufacturers produce modified pigments with enhanced lightfastness, weather resistance, or altered color properties. Downstream, Chrome Yellow serves as a core chromophore in blended inorganic pigment compositions for specialized plastics and coating systems.
Pigment requires dry storage, away from strong light and reactive chemicals. Moisture uptake risks caking and promotes slow decomposition. For bulk storage, low humidity environments prevent both physical clumping and undesirable chemical changes.
Chrome Yellow remains inert toward typical steel or HDPE drums, provided containers are free from reactive residues. Packaging integrity must be monitored to avoid contamination and physical degradation over prolonged storage or transport.
Shelf life depends on packaging and storage management. Prolonged storage in open or high humidity settings accelerates pigment darkening and caking. Detection of off-odor, color shift, or visible agglomeration signals the need for quality reevaluation before use in critical production.
Chrome Yellow is classified as hazardous due to lead and chromate content. Most jurisdictions require occupational safety labeling and transport control based on both acute and chronic toxicity concerns. Safety data reflects the combined risk of lead toxicity and chromate carcinogenicity.
Production and use demand engineering controls to minimize dust exposure, including effective local ventilation, enclosed process steps, and personal protective equipment. Regulatory standards dictate hygiene requirements in all handling zones.
Toxicology reflects the cumulative risk of lead and hexavalent chromium exposure over time, especially via inhalation or prolonged skin contact. Both acute and chronic health effects are possible, including cancer risk.
Permissible exposure limits are regulated according to national worker safety standards and may require air monitoring at use points. Operational best practices include regular workplace monitoring, preventative maintenance for dust control systems, and medical surveillance for exposed personnel.
Chrome yellow supply depends on the production scale of facilities specializing in lead chromate synthesis. As a chemical manufacturer, production throughput in a given campaign is determined by the quality consistency of raw lead salts and sodium chromate, filtration system performance, and downstream drying capacity. Seasonal maintenance often affects output. Supply chain reliability for sodium dichromate and lead nitrate dictates upper output ceilings. Availability is directly tied to order frequency for various color shades and grade requirements — strict on-site segregation is necessary to prevent cross-grade contamination.
Routine fulfillment aligns with lot sizes engineered for batch reactors and filter presses, with MOQ tailored to optimize resource allocation and minimize frequent grade changeover. Shortest lead time can be met for standard grades with pre-set process parameters. Application-specific grades involving tailored impurity controls, particle size specification, or specialty stabilizers generally require longer cycle times due to custom batch adjustments and extended laboratory release testing.
Standardized packaging uses multi-wall paper or fiber drums with polyethylene inner liners, critical for limiting dust leaks and mitigating moisture risk during ocean transit. Bulk deliveries for high-volume industrial paint and plastics clients proceed in flexible intermediate bulk containers (FIBCs). Variation in packaging weights, liner composition, and palletization formats can be arranged to fit end-user equipment — final choice often dictated by regional regulatory norms and customer handling protocols.
Shipping arrangements factor in legal restrictions on transport of lead compounds; many regions require UN-certified hazardous goods shipping protocols and vapor-tight containment. Payment schedules frequently favor irrevocable letters of credit or milestone-linked remittances, especially for non-routine batches or regions with unstable currency positions.
Chromium and lead salts dominate the materials bill, with quality and source purity dictating final process yield and impurity carryover. Price surges often correlate with supply shocks in sodium chromate or environmental restrictions tightening access to high-purity lead nitrate. Power cost instability, especially for drying and calcination, acts as a secondary driver in price formation. Environmental handling fees for chromate waste are rising, influencing delivered cost.
Pricing between grades is mainly influenced by the stringency of metal ion impurity cut-offs and the specification of sizing or coating agents. Coarse grades for road marking applications command lower prices due to relaxed filtration and purity control, while pigment grades for high-end coatings require multi-stage purification, tighter process controls, and more frequent in-process sampling. Packaging choices involving anti-leak liners or compliance with child-resistant features create incremental cost differences. Certifiable packaging upgrades responding to new REACH or TSCA registrations have resulted in stepwise price increments for compliant supply.
Chrome yellow manufacture faces a shrinking footprint in North America and Europe — much of the global supply realigns toward Southeast Asia and selected sites in China and India, where environmental permitting and chromate management costs weigh less heavily. Downstream demand in decorative paints and plastics shifts by region, influenced by regulatory pressure on lead pigments and ongoing substitutions in end formulas.
Regulations in the United States and EU continue to drive users toward safe alternatives, restricting the use of chrome yellow except in regimes with strict industrial hygiene controls and legacy application exemptions. Japanese users still specify high-purity pigment for certain printing and engineering plastics, although volumes decrease year by year. Indian and Chinese industrial users remain major importers and domestic consumers for non-critical colorant functions. Realignment of internal Chinese environmental policy — especially around chromium-containing effluent — regularly stirs short-term market volatility.
By 2026, continuing pressure from international agencies to restrict lead compounds in consumer products likely intensifies regional demand disparities. Pricing remains steady to upward for European and US-compliant certified grades; specialty batches with REACH or TSCA documentation command significant premiums due to added compliance cost and periodic batch retesting. Standard commodity grades supplied to Asian plastics and construction pigment markets may experience volatility, tracking raw lead and chromate price swings and energy cost fluctuations.
Industry price trend analysis references public customs records, trade data, internal post-shipment calculations, chemical industry market reports, and collective benchmarking with peer manufacturers. Price forecasts are based on current regulatory trends, known supply chain disruptions, and continuous raw material contract review.
In the past year, several Asian manufacturers have installed advanced wastewater treatment plants to contain hexavalent chromium discharge, preventing operational shutdowns from regulatory surprise checks. Notable consolidation among pigment producers reduced excess capacity in the Chinese market. Some importers in the EU and US have diversified supplier portfolios in anticipation of extended supply delays due to routine environmental audits in Asia.
Recent action from European authorities confirms stricter scrutiny on pigment import declarations, especially sensitivity to trace metal content and labeling accuracy. Final user declarations in the plastics field must now trace pigment origin back to each production batch. Successful passage of REACH and TSCA audits for high-purity pigment remains a primary differentiator for continued market access to regulated regions.
To maintain global supply reliability, manufacturers invest in segregated production lines for certified grades, automate record-keeping for full batch traceability, and partner with transportation firms equipped for hazardous materials logistics. Internal process documentation standards require real-time monitoring of emission levels, periodic raw material requalification, and dual-lab final batch release testing for certified markets.
Chrome Yellow has served as a core inorganic pigment for decades across coatings, plastics, inks, rubber compounds, artist colors, and construction marking systems. Its bright, opaque shade and weathering profile drive usage in coating heavy machinery, safety marking for road paints, industrial enamels, adhesives, and coloration of PVC-based polymer systems. Paint and pigment manufacturers use Chrome Yellow where high dispersion stability and reproducibility matter, including primers and undercoats. In rigid and flexible PVC compounding, Chrome Yellow delivers strong color buildup at moderate loadings. Printing ink formulators require tight particle size control and specific tint undertones for packaging and commercial graphics. These diverse applications mean strict alignment of product grade, process, and regulatory compliance for downstream integration.
| Application Area | Typical Required Grade | Key Manufacturing Controls |
|---|---|---|
| Industrial Coatings (Machinery, Enamels) | General Industrial Grade / High-Weathering Grade | Weathering cycle control, dispersibility, color index consistency |
| Road Marking Paints | Traffic Marking Grade | Particle size optimization, binder compatibility, brightness stability |
| Polymer Compounding (PVC, Rubber) | Low-Oil Absorption, High-Purity Grade | Oil absorption management, heavy metals screening, migration testing |
| Printing Inks | Fine Particle, Low-Residue Grade | Filtration threshold, solubility test, undertone repeatability |
| Artist Colors | Artist/Premium Grade | Color saturation, lightfastness, heavy metal specification, micro-grit removal |
Performance requirements depend on the end-use context. In coatings, particle size distribution and color development reproducibility frequently drive batch acceptance. Polymer compounders seek minimized oil absorption and low residual salts for optimum melt mixing. Printing ink makers push for particulate cleanliness and tight tint controls. Artist color houses test chromatic intensity and micro-impurity exclusion. Each industrial segment reacts differently to minor deviations—whether in dispersibility, weathering response, or regulated metal residual content. Proper grade mapping comes from understanding these technical needs at the formulation and processing levels.
State the intended end-use—coating type, polymer system, ink chemistry, or artist medium—since pigment grade affects stability, performance, and compliance in each context. Notify technical staff of any specific process stresses, such as high-shear mixing, thermal exposure in plastics, or alkaline pH in adhesives.
Refer to sector mandates—such as EN71-3 for toys, REACH, EPA, or country-specific toxicity limits. These frame allowable impurity profiles, especially for lead and soluble chromium. Identify whether any food-contact restrictions or labeling constraints apply. The release grade must match local and destination regulatory lists; request a batch Certificate of Analysis referencing all relevant test methods.
Assess whether the downstream process tolerates trace impurities, considering how even minor increases in water-soluble salts, metals, or organic residues might impact color, gloss, or mechanical processing. Higher purity grades undergo more intensive washing, filtration, and heavy metal testing. For large-scale commercial coatings or thermoplastics, consistent purity ensures trouble-free production runs and finished product compliance.
Define estimated draw volumes per month or year and check alignment with targeted grade. Higher purification or special particle treatments affect cost structure. Economies of scale can sometimes be achieved for large batch commitments. Discuss options for standardized product versus tailored supply to balance cost and technical requirements.
Source a representative production sample for qualification. Quality control labs typically evaluate color, particle size, surface treatment, and batch stability in actual end-use conditions. Full-scale trials reveal suitability before committing to long-term supply agreements. The supplier technical team will monitor reproducibility and address any formulation or process compatibility questions at this final stage.
Quality compliance for Chrome Yellow production reflects our ongoing investment in standardized control procedures from raw materials sourcing to packed product dispatch. Our production operations undergo independent audits aligned with ISO quality management frameworks. Process-specific checkpoints—such as pigment precipitation, washing, and drying—are monitored through established in-process validation routines. Actual certification status may vary by plant region and customer order requirements, ensuring all commitments reflect the exact batch release stage and traceable documentation.
For Chrome Yellow, downstream users may require conformance with industry-specific regulations regarding lead and hexavalent chromium content (for example, toy, paint, or plastics safety standards). Certification availability depends on product grade: industrial pigments and regulated grades involve differing levels of testing and technical dossier filing. Product declarations specify compliance based on both analytical batch records and the route of synthesis, considering impurity carryover and raw material purity. Inquiries for specialized applications receive project reviews matching the intended regulatory jurisdiction.
Each Chrome Yellow shipment includes a comprehensive Certificate of Analysis (COA) reflecting batch-specific parameters—color strength, tinting values, sieve residue, and regulated impurity levels. Reports on heavy metal content, product origin, REACH or local chemical inventory registration are available as required. Long-term cooperation arrangements allow for tailored documentation suites, including Method of Analysis (MOA) disclosure, traceability lot histories, and recurring statistical process control summaries. Information transparency is grounded in recorded QC test results for every lot released.
Reliable supply stems from maintaining consistent production scales and core stocks of key intermediates. Chrome Yellow demand can fluctuate seasonally or by region; our installed capacity and inventory buffer adapt to support JIT (Just-In-Time) models and long-term fixed-schedule procurements. We accommodate both continuous supply contracts for high-volume clients and smaller batch requirements for specialty users. Fluctuations in upstream raw material markets are managed through dual sourcing and process route adjustment, minimizing delivery risk.
Production capacity for Chrome Yellow hinges on the plant’s operational parameters—reactor throughput, filter press cycle time, and downstream drying. Actual output allocation depends on the pigment grade, customer order history, and contracted offtake volumes. Process risk mitigation targets batch consistency and minimal cross-grade contamination; dedicated lines are provided for critical applications, especially where trace impurities can impact end-use performance. Supply capability is always tied to both material availability (salts, sodium dichromate, lead compounds) and regulatory compliance for environmental control.
Sample requests require a technical alignment review. Application details—end-use sector, grade required, target specifications—inform the selection from production batches and appropriate grade documentation. Standard sample pack sizes reflect laboratory or pilot trial needs. Every sample dispatch includes batch COA and, where requested, a statement of intended use registration alignment. Feedback channels remain open for technical support during sample evaluation, allowing iterative matching and further analytical report sharing if needed.
Flexible purchase arrangements range from fixed-term bulk contracts to spot market transactions, depending on procurement policy, storage space, and monthly consumption. Customers with irregular requirements may opt for call-off orders, securing reserved production lots without immediate delivery. For custom processing or specialty formulation needs, cooperative development agreements involve confidential joint product optimization and periodic technical review. Value-added services, such as consigned inventory or synchronized delivery coordination, match partner’s logistics planning. All supply modes answer to the principle of aligning production schedules with client-side demand volatility and evolving application criteria.
Research centers on achieving reduced lead content for regulatory compliance and occupational safety. Chrome yellow production relies on carefully controlled precipitation of lead chromate under defined temperature and pH parameters. Technicians monitor particle morphology and pigment dispersion, using additives to tailor properties for plastics, coatings, and printing applications. Formulation scientists push for reproducible color development with stricter control on impurity profiles, driven by end-user scrutiny and environmental compliance.
Substitution studies continue, as customers explore modified systems for road markings, plastics, and artist’s materials. Some manufacturers cooperate on hybrid pigment systems, blending chrome yellow with organic or encapsulated grades to bridge performance and safety. Downstream converters request custom dispersions optimized for high-shear mixing and minimal agglomeration during polymer compounding or ink milling.
Batch variability, heavy metal content, and process effluent remain the main technical hurdles. Lead and hexavalent chromium monitoring are non-negotiable in production. Researchers in manufacturing lines utilize real-time analytics, aiming for tighter control of particle distribution and surface treatment. Where regulatory frameworks tighten, teams investigate encapsulation and surface modification to reduce pigment migration and environmental release.
Demand for chrome yellow continues in legacy sectors—industrial paints, traffic lines, and plastics that require strong tinting strength and outdoor durability. Most volume persists where technical substitutions cannot yet fully match the lightfastness or heat stability of chromate pigments. Expansion is tightly capped by regulatory restrictions, and markets facing added scrutiny trend toward lower-chrome contents or dual-phase analogue systems.
Process innovation focuses on minimizing off-spec waste and lowering residual contamination in both pigment mass and process wastewater. Automated dosing and in-line monitoring for chromium and lead content replace once-manual controls. Surface-engineering research adjusts pigment wetability for better integration in water-borne systems, reducing the need for auxiliary dispersing agents.
Production strategies target waste minimization at every step: closed-loop water systems, optimized reagent dosing, and targeted purification to redirect byproduct streams. Many facilities install filtration and chemical reduction units to cap off-site discharge. Strict European and North American regulations have led process engineers to pursue alternatives like encapsulated chromates and surface-passivation techniques to curb leaching and dusting.
Technically qualified staff respond directly to formulation inquiries, working through dispersion protocols, selectivity for binder types, and compatibility with specific resin or plasticizer systems. Guidance is always referenced to grade-specific properties and application environment, as requirements for opacity, oil absorption, and heat resistance depend on the target formulation.
Application teams provide on-site and laboratory-based support, carrying out tailored millbase and letdown studies using customer-supplied bases. Support includes troubleshooting for dispersion stability and color development under real-world mixing conditions. Process engineers may recommend switching to microgranular or surface-treated chrome yellow grades for improved integration where shear-sensitive systems are at risk of flocculation.
Manufacturing and quality control departments manage after-sales claims on batch consistency, lot traceability, and regulatory documentation. Sample retention systems and analytical archives back up each lot release. Clients access technical dossiers that include impurity screening results, recommended storage conditions tailored to climate, and stability monitoring under typical transit and warehousing situations. All after-sales investigations reference actual batch QC data and documented process controls from internal records.
Our facility produces Chrome Yellow pigment in a tightly controlled environment, using select raw materials and continuous batch monitoring. Our process assures the particle size, shade, and chemical stability required for high-load pigments. By holding the reins on every step from synthesis to finished powder, we deliver a product line that meets stringent batch-to-batch color consistency targets.
Paint and coatings manufacturers turn to our Chrome Yellow for its brightness, opacity, and tint strength in outdoor and industrial environments. The pigment gives protective primers and road marking paints the robust, long-lasting color retention that designers and contractors rely on, despite exposure to sunlight and weathering.
In plastics, the pigment resists migration and bleaching under heat and processing pressures, essential for automotive, signage, and molded goods that must keep their color in demanding settings. Printing ink producers specify our Chrome Yellow for presses that demand sharp separation and accurate color reproduction across large runs.
Each lot runs through our laboratory for colorimetric analysis, insoluble residue, and purity assays. If a batch falls outside the product specification, it does not continue to packaging. Our plant’s closed-loop feedback systems and automated dosing reduce human error, driving the product stability that formulators in specialty coatings and high-performance plastics expect.
Bulk packaging options support different supply chain needs, from industrial sacks to lined drums on pallets for export routes. By controlling both process and logistics, we offer delivery volumes from single tons to full-container shipments, serving daily operational needs as well as scheduled production cycles.
Process engineers at our site provide technical consultation for melt blending, dispersion, and compatibility in complex applications. Support includes practical advice for large-scale implementation, minimizing downtime during color changes or new grade evaluation. Our team’s focus stays on application performance, not just pigment specification.
By managing every aspect of pigment production and despatch, we reduce the variables that often lead to off-spec results, delays, and costly interruptions. Repeated product trials with incoming lots become unnecessary, cutting working capital tied up in extended in-house qualification cycles. For procurement teams and distribution managers, the supply certainty and quality predictability we deliver help underpin commitments made to downstream customers.
Production scale, technical reproducibility, and delivery reliability are the foundation—not just generic product claims—behind our ability to support automotive, paint, ink, and plastics manufacturers looking for dependable Chrome Yellow pigment and reliable partnership over the long term.
We produce Chrome Yellow by combining lead compounds with sodium or potassium chromate salts, following a precise chemical precipitation process. The core chemical structure centers on lead(II) chromate, typically denoted as PbCrO4. This gives Chrome Yellow its characteristic bright, opaque yellow shade that made it popular in pigments for over a century. Our process ensures close control over the lead and chromate ratio. This matters—small shifts during filtration, washing, or calcination can noticeably influence tint strength and shade development from lemon yellow to deeper, more reddish hues.
Our technical team pays close attention to every parameter, because pigment users in coatings, plastics, and printing expect a repeatable result. Inconsistent precipitation leaves you with off-shade, weaker chromatic intensity, or poor dispersion. Measuring CrO42- purity, residual lead acetate, moisture content, and particle size reflects our care for batch integrity. Reliable pigment performance does not come from chance—it grows from precisely managed chemistry. Our laboratory uses atomic absorption and UV-Vis for chromate quantification, confirming the product meets the benchmark required for industrial-grade coloring.
We produce pigment-grade Chrome Yellow with strict adherence to purity. Trace levels of sulfate, carbonate, or silica are kept far below limits, since these affect color strength and durability. High pigment grade requires the right crystal structure—typically monoclinic for medium and reddish shades, orthorhombic for lighter, lemon shades. We control crystal growth using regulated pH and temperature profiles. Particle size distribution has a direct role in dispersibility—our average particle diameter falls in the micron range, supporting smooth processing in resin systems. Surface treatment or coating options can further tailor wetting in waterborne or solventborne formulations.
Chrome Yellow incorporates lead and hexavalent chromium, both regulated substances due to toxicity risks. Our factory process includes enclosed systems, filtration, and waste treatment to keep effluent within local discharge criteria. Product batches come with analysis on hexavalent chromium concentration and heavy metals, allowing downstream users to manage exposure according to the most recent restrictions. Our technical dossier supports safe handling, especially for industrial paints and inks, and outlines permissible usage under hazard communication guidance.
Consistent pigment grade only emerges from dedicated attention at every production step. Particle size, moisture, tint strength, residue on sieve, oil absorption, and chrome content—each factor gets routine monitoring. Our lab maintains reference panels, color-matching standards, and sample retention to address user queries over long-term projects. For special requirements, such as specific particle sizes or surface treatments, our development chemists can engineer Chrome Yellow variants for target end-use. We support our pigment partners with full chemical disclosure and regulatory documentation to streamline supply chain transparency.
As a direct manufacturer with hands-on experience spanning decades, we navigate regular inquiries about bulk supply and packaging of Chrome Yellow. Chrome Yellow remains an essential inorganic pigment for plastics, coatings, printing inks, and industrial paints—fields driven by tight procurement schedules and cost sensitivity.
Every day in our production facility, raw materials flow through continuous reactors and filtration systems dedicated to this pigment. Our operations run near capacity, handling both large-scale orders and regularly scheduled demand. Bulk procurement is not a theoretical offering. We load multi-ton batches for high-volume clients who count on regular, stable quality. Our bulk supply chain relies on tightly integrated logistics, which includes lined drums, supersacks, palletized bags, and, in certain long-term agreements, direct tanker or silo deliveries.
Standard commercial packaging at our plant covers a range of options, typically from 25 kg paper-plastic composite bags up to 1,000 kg FIBCs (jumbo bags). These packages are sealed, palletized, and feature clear labeling with batch numbers for traceability. There is no universal ‘one-size-fits-all’ for pigment consumers: technical teams may require flexible solutions for their unique batch handling systems and storage spaces, and our operations adjust accordingly.
We understand the regulatory and practical reasons driving customers to prefer sealed, coded bags or bulk loose filling. Regular feedback from procurement and compliance teams shapes our packaging and documentation procedures. In the case of Chrome Yellow, containment is also about worker safety and environmental controls. Our plant maintains strict monitoring of dust, runoff, and residual pigment waste. We contribute technical insights during customer audits to demonstrate handling best practices—experience you do not get from a trading intermediary.
Bulk Chrome Yellow procurement involves more than just ordering bigger volumes. With larger loads come increased scrutiny on consistency, purity, and documentation. Our analytical lab conducts regular batch checks for particle size, shade, and lead content, aligning with both local and international standards. Before shipping, our quality control team inspects packaging for seal integrity and labeling clarity. We also maintain records going back several years in accordance with regulations, ready for customer QA verification at any time.
From an efficiency standpoint, factory-direct engagement benefits bulk buyers. Direct conversations with our technical and commercial team ensure requirements are understood and met the first time. Our staff have experience supporting scale-ups for new product launches and retooling existing lines for higher capacity—knowledge that comes from regular exposure to the challenges faced by pigment users. We routinely supply both scheduled releases and spot orders, assisting in inventory management for reduced downtime on the customer side.
Direct bulk procurement of Chrome Yellow is always available as part of our standard offering. Packaging options range from standard small bags through to multi-ton super sacks, shipped domestically or for export. We stand behind each batch with documented test results and technical support, and provide material safety and compliance documentation for audit or customs requests.
Every bulk order receives dedicated logistical oversight, ensuring proper packaging and regulatory compliance end-to-end. Chromatic consistency and purity have a direct impact on our brand, not just our customers’ products. As manufacturer, we align scale, packaging, and quality management directly to the customer’s procurement needs—this is the guarantee only direct manufacturing can provide.
Questions on Chrome Yellow compliance with REACH and transportation regulations surface frequently, especially from importers, industrial painters, and coatings formulators. As direct manufacturers, our responsibility stretches from raw material selection to post-shipment documentation. Chrome Yellow pigments, classified as lead chromate-based compounds, bring vibrant color and technical performance, but product safety and legal transport dominate the discussion today, not aesthetics.
Under the European Union’s REACH regulation, substances containing hexavalent chromium or lead carry strict obligations. We trace every production lot from entry of sodium dichromate through final packing. Full traceability ensures we know precisely what enters and exits our reactors and when. Our technical team maintains up-to-date files for every Finished Product Notification and pre-registration. In the case of Chrome Yellow, compliance goes well beyond paperwork; we continually monitor evolving restrictions, especially Annex XVII, which addresses lead compounds and chromates. Applications involving children’s toys, cosmetics, or food-contact materials generally fall outside our supply scope due to regulatory bans on such uses.
Each batch undergoes analytical checks to confirm that impurity levels stay within permitted thresholds. Where required, we implement additional purification or use specialty reagents to control contamination from substances of very high concern. Documentation is always available: full Safety Data Sheets, Certificates of Analysis, and, if requested, technical dossiers outlining our approach to REACH compliance. If new regulatory amendments appear, we work directly with customers in the EU to update supply contracts and technical documentation.
Transporting Chrome Yellow presents special demands: its UN classification (UN 3077, Environmentally Hazardous Substance, Solid, N.O.S.) means we ship under ADR, IMDG, and IATA regulations for hazardous goods. This requires precise marking, robust packaging, transport documentation, and coordination with logistics firms authorized for dangerous goods carriage. Our standard export drums, bags, and intermediate bulk containers undergo regular stress and compatibility testing to ensure safe transit under varying temperature and humidity.
At shipping, our logistics team provides a complete set of documents, including the Dangerous Goods Declaration, product SDS in the recipient’s language, and compliant shipping labels with the required hazard pictograms. We train our warehouse staff and drivers annually in dangerous goods handling and spill response as part of our ISO 14001 environmental management system.
We have experienced increased regulatory scrutiny in recent years, especially since several EU member states have proposed further tightening on chromates and lead pigments. As a direct manufacturer, we work proactively, monitoring amendments and substituting safer formulations where applicable, particularly for international clients who require compliance in multiple jurisdictions. Alternatives such as bismuth vanadate or lead-free organic pigments have seen greater use, and our R&D lab always keeps customers informed about their technical fit.
REACH and hazardous transport compliance cannot be viewed as a one-time exercise—both require ongoing vigilance, testing, and investment. As regulations evolve, we adjust production, packaging, and documentation to keep Chrome Yellow compliant in markets worldwide. We share regulatory updates, compliance certificates, and technical details without delay. That’s the reality of what manufacturing means in today’s chemical industry: safe, legal, and fully traceable product from production line through to delivery at your site.
For product inquiries, sample requests, quotations or after-sales support, please feel free to contact me directly via sales7@bouling-chem.com, +8615371019725 or WhatsApp: +8615371019725
