SBX, SIBX, PAX, PBX, PEX Powder form and Pellets form PURITY: 90% Min. FREE ALKALI: 0.2% Max. MOISTURE AND VOLATILE: 4.0% Ma POTASSIUM BUTYL XANTHATE (PBX) CAS#871-58-91. Powder form 2. Pellets formSpecifications: PURITY: 90% Min.FREE ALKALI: 0.2% Max.MOISTURE AND VOLATILE: 4.0% Max.Packing: 120kg/iron drum; 180kg/iron drum; 850kg/boxSupplying SBX, SIBX, PAX, PBX, PEX POTASSIUM BUTYL XANTHATE