CAS NO: 108-31-6 H.S. Code: 2917140000 Main components (formula): C4H2O3 Specification: Appearance: White crystal sphericity Main content: 99.5% min. Crystallization point: 52.40 min Ash: 0.005% max Fe : 5 ppm max . Chroma: 25. Packing: 25kg/bag. Loading: 20mt/20s fcl on pallets..