... refrigerant gas Model:6.5kg in disposable cylinder Quality: purity 99.9% min, moisture 10ppm max Classification: Alkyl & DerivativesCAS No.: 75 ... .5KG PER CYLINDER ISOBUTANE R600A QUALITY INDEX: Quality standardPurity, %≥99.9 Moisture, PPm≤10 Acidity, PPm≤1 Vapor Residue, ... ARE OUR MAJOR PROUCETS, most gases purity above 99.9%, some above 99.5%. it reaches the international standard quality requirement ...