Description Silicon Dioxide, Fused Pieces 1-12mm, 99.98% (Trace Metals Basis), Certified, 100g For Research & Development Not for drug, human, animal, or food use Certificate of Analysis: Appearance (Color) Clear Appearance (Form) Fused Pieces Assay (Metals Basis) 99.98% Particle Size 1-12mm ICP Analysis Conforms Total metallic impurities (ppm): (Ca) <5 (K) <20 (Na) <80 Suitable for Vacuum deposition CAS: 60676-86-0 FORMULA: SiO2