CAS:: 70693-62-8 Molecular Formula: KHSO5 · 0.5KHSO4 · 0.5K2SO4 Molecular Weight: 307.38 g/mol Synonym(s): Potassium peroxymonosulfate Test Specification Description White, granular, odorless, free-flowing powder Active Oxygen 4.5% min. Water 0.1% max. Typical pH (1% solution @ 25 Deg. C) 2.3 Particle Size USS# 016 (1180um) 99 - 100% Particle Size USS# 020 (850um) 80 - 100% Particle Size USS# 030 (600um) 63 - 100% Particle Size USS# 100 (150um) 5 - 33% Particle Size USS# 200 (75um) 10% max. Particle Size USS# 325 (45um) 3% max.