Overview
Lithopone is a composite pigment first commercialized in the 19th century as a cheaper alternative to lead-based whites. Comprising barium sulfate (BaSO₄) and zinc sulfide (ZnS), it combines the inertness of barium sulfate with the refractive properties of zinc sulfide. Though partially replaced by titanium dioxide in premium applications, it remains popular in cost-sensitive industries due to its balanced performance and lower environmental impact compared to heavy metal pigments. Modern lithopone grades are engineered for specific applications, with variations in particle size distribution and surface treatments. Its recycling potential (recovered from industrial waste streams) adds to its sustainability profile, making it relevant in circular economy initiatives.
Physical and Chemical Properties
Lithopone's whiteness (85-92% on the ISO scale) and refractive index (~1.84) make it effective for scattering light in coatings. Unlike titanium dioxide, it exhibits minimal photocatalytic activity, reducing degradation risks in polymer matrices. The material is thermally stable up to 350°C, beyond which zinc sulfide oxidizes to zinc oxide. Chemically, lithopone resists alkalis and weak acids but decomposes in strong acids due to zinc sulfide reactivity. Its oil absorption value (14-18 g/100g) influences paint rheology, requiring formulation adjustments. Particle sizes typically range from 0.3 to 0.7 microns, optimized for opacity without compromising dispersion stability.
Main Applications
In the paint industry, lithopone reduces formulation costs while maintaining adequate hiding power in interior emulsions and primers. Its UV stability suits traffic markings and agricultural equipment coatings. Plastics manufacturers use it in PVC products (e.g., pipes, cables) where titanium dioxide's photoactivity could degrade polymers. The rubber sector employs lithopone as a reinforcing filler in white or light-colored products, benefiting from its inertness during vulcanization. Specialty applications include artist paints (historically significant), paper coatings requiring brightness without fluorescence, and low-gloss inks where its moderate reflectivity avoids metallic sheen.
Safety and Storage
While lithopone is classified as non-hazardous under GHS, inhalation of fine dust may cause mechanical irritation to respiratory tracts. Facilities should implement local exhaust ventilation and provide NIOSH-approved N95 masks for workers handling bulk powder. Spills should be contained with inert absorbents to prevent slurry formation. Storage requires moisture-proof packaging (often 25kg multilayer bags) on pallets away from acidic vapors. Bulk silo storage necessitates explosion-proof equipment due to potential dust combustibility (minimum ignition energy >1,000 mJ). Shelf life exceeds 2 years if kept dry, though caking may require mechanical re-dispersion for optimal performance.
B2B Procurement Guide
Industrial buyers should specify zinc sulfide content (standard 28-30% or high-grade 40%) and trace metal limits (<50 ppm lead/cadmium) for regulatory compliance. Request test certificates for brightness (ISO 2470) and residue on 325-mesh sieve (<0.5% preferred). For plastic applications, verify heat stability via thermogravimetric analysis reports. Regional pricing varies with barium ore and zinc processing costs. Southeast Asian suppliers often offer competitive rates ($800-$900/ton for standard grade), while European producers charge premiums for micronized versions ($1,100-$1,200). Consider toll manufacturing agreements for large-volume buyers needing custom surface treatments like silane modification for polymer compatibility.
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