Model Number: SO75-99 Key Specifications/Special Features: Our silica powder (fused silica powder) with a small coefficient of thermal expansion, low internal stress, high moisture resistance, low radioactivity and other excellent featuresHas the following characteristics: very low linear expansion coefficient, good electromagnetic radiation, chemical resistance and other stable chemical properties, reasonable and orderly, controllable particle size distributionThis product is mainly used in electronic packing, investment casting, high-grade electrical insulation, paint coatings, silicone rubber and other industries, we provide various kind of silica power as your requested CompositionSiO2Al2O₃Fe₂O₃ MgO CaO NaO PH Average value 75 to 99% 1.0±0.2% 0.9±0.3% 0.7±0.1% 0.3±0.1% 1.3±0.2% natural