Vitamin C (VC), also known as Ascorbic Acid, is a vitamin that human body can not produce on its own. It plays, however, an important role in the metabolism of human body and physiological function regulation and is one of the essential nutrients for the living of humans. Vitamin C is also the essential nutrient for animals and used as animal additive. It can promote the growing and breeding of animals, increase the meat and milk output and develop the animals' immunity from disease. Specifications: 1) Assay: 99.0% - 100.5% 2) Identification: positive 3) Melting point: about 190.7 - 190.8癈 4) Clarity of solution: clear 5) Color of solution: BY7 max 6) PH value: 2.1- 2.6 (in 2% solution) 7) Oxalic acid: 0.2% max 8) Heavy metals: 5ppm max 9) Ferrite: 2ppm max 10) Arsenic: 3ppm max 11) Hg: 1ppm max 12) Lead: 5ppm max 13) Sulphate ash: 0.1% max 14) Copper salt: 5ppm max 15) Specific rotation: +20.5 ~ +21.5? 16) Organic volatile impurities: meets the requirements 17) Particle size: 100% pass thru 40 mesh; 50% pass thru 80 mesh 18) Appearance white crystalline powder 19) Storage: store in a cool and dry place 20) Shelf life: three years in dry conditions after production 21) Storage: store in a cool and dry place 22) Shelf life: three years in dry conditions after production Packing: 25kg/carton box with PE liner