| ZnS_content_wt% | > 98.0 |
whiteness_L* | > 97.0 |
| D50_µm | approx 0.5 |
hiding_power_vs_TiO2 | > 52 |
| pH | approx 7 |
Mohs_hardness | 3 |
S-20 Zinc Sulfide is a high-purity, ultrafine white pigment engineered by Yunfu Hongzhi New Materials Co., Ltd. for demanding industrial applications in coatings, plastics, rubber, and paper. With exceptional dispersion stability and minimal UV absorption in the 360–400 nm range, it serves as a functional alternative to titanium dioxide in UV-curable white systems where photoinitiator efficiency and substrate compatibility are critical. Its low Mohs hardness (3) enables mold protection in rigid plastic processing, while its chemical inertness across pH 4–12 ensures formulation robustness in acidic or alkaline media. Widely adopted in glass fiber-reinforced plastics (GRP), S-20 contributes both optical performance and mechanical property retention — making it especially valuable for automotive interior parts, architectural coatings, and specialty packaging requiring non-yellowing whiteness and long-term durability.
1. Ultrafine particle size (D50 ≈ 0.5 µm) ensures smooth dispersion and high hiding power (>52 vs. TiO₂ reference).
2. Exceptional whiteness (L* > 97.0) and narrow particle distribution deliver consistent color and brightness.
3. Low UV absorption enables compatibility with UV-curable resins without compromising cure speed or depth.
4. Chemically stable from pH 4 to 12; resistant to hydrolysis and corrosion in diverse formulations.
Store in a dry, cool, and well-ventilated area away from direct sunlight and moisture. Keep sealed in original packaging to prevent agglomeration or contamination. Shelf life is 12 months under recommended storage conditions. When handling, avoid inhalation of dust; use appropriate PPE including N95 respirators and gloves. For mixing, pre-disperse in carrier solvents or resins using high-shear dispersion equipment to achieve optimal deagglomeration and uniform distribution.; Storage condition: 25 kg bag; Shelf life: 25 kg bag; Pack size: 25 kg bag
