Fumaric acid (1).【CAS】 : 110-17-8 (2). Molecular Formula: C4H4O4 Molecular weight: 116 （3）Performance and use: white crystal, fruit sourness, burn It is mainly used as material of polyester resin and alkyd resin. It can produce bond with ethylene-vinlacetate copolymer, also can be used as sourness powder in food, drink and chemical material. The company can produce 2000 tons per year of it, in front of national same industry, the product exports to Japan, Korea and others. (4).Physical and chemical specifications： Item: excellent, one grade, acceptable water （%）：≤ 0.2 0.5 1.0 Color（APHA）： ≤30 50 white crystal content（%）：≥ 99.5 99.0 98.0 ； melting point ： 287℃； relative density（d204）： 1.635