: 45 ICUMSA Attenuation index units Method # 10-1978 : 0.04% Maximum by Weight : 0.04% Maximum by Weight : mg/kg 4 : 100% DRY & Free Flowing : Fine Standard : 99.80º Minimum : 1 P.P.M. : 2 P.P.M. : 3 P.P.M. : Sparkling White : NONE : mg/kg 20 : 0.010% Maximum in Dry Mass : Normal w/o presence of cesium or iodine SO2: Certified : Solid, Crystal : Free of any Smell