Specification: Industrial Grade (GB/T 1587-2000) Inspect Ion Item Unit Fine Grade Technical Grade First Grade Regular Grade Purity(as K2CO3) % Min 99.0 99.0 98.5 96.0 Chloride(as KCl) % Max 0.01 0.03 0.10 0.20 Sulphate(as K2SO4) % Max 0.01 0.04 0.10 0.15 Iron % Max 0.001 0.001 0.003 0.010 Nsoluble matter in water % Max 0.02 0.04 0.05 0.10 Burnt loss % Max 0.6 0.8 1.00 1.00 Specification: Food Grade (HG2452-93) Nspect Ion Item Unit Standard Purity(as K2CO3) % Min 99.0 Chloride(as KCl) % Max 0.01 Sulphate (as K2SO4) % Max 0.01 Iron % Max 0.001 Insoluble matter in water % Max 0.02 Burnt loss % Max 0.6 Arsenic % Max 0.0003 Heavy Metal(as Pb) % Max 0.002