... manufacturer of zinc borate 3.Particle Size D50:3-5 micron Zinc Borate For PVC Wall Paper Molecular formula: 2ZnO·3B2O3·3. ... toxicity, slight solubility in water, good thermal stability, fine particle size, low specific gravity, great free-flowing etc. As one ... it is widely used in textile, fiber, floor, leather, wall paper, carpet, paint etc decorative materials to improve flame retardant performance ...