Tannic acid (ellagic acid): tannic acid (ellagic acid) Alias: tannic acid; tannins gall tannic acid tannin formula C76H52O46 Relative molecular weight of 1700 physical and chemical properties: yellow to brown-yellow powder, black air . Odorless, has a strong astringency. Combustible. Insoluble in water. Melting at 210 to 215 ° C decomposition. The flash point of 187 ° C. Self-ignition point of 526.6 ° C. Uses: clarifying agent, by astringent agents, crude oil deodorant, Hong aid; tannic acid can be used in leather tanning, ink manufacturing, paper and silk glue, boiler cleaning, but also as a mordant, beer and wine Clarification agent, rubber condensation agent. Can be used for printing and dyeing, metallurgy, medicine and other industries. Packing: Industrial: plastic bag lined gunny bags, net weight 50kg. Medicine: packed in plastic bags, each bag 250g. Then packed in wooden boxes, each box Net weight 10kg. Should be sealed packaging, store in a cool, dry and ventilated place, avoid moisture. As a general chemical storage and transportation requirements.