Fumaric acid, also known as fumaric acid, is used to produce unsaturated polyester resin. This kind of resin is characterized by good chemical corrosion resistance and heat resistance; The copolymer of fumaric acid and vinyl acetate is a good adhesive. The copolymer with styrene is the raw material for manufacturing FRP. The plasticizer prepared by fumaric acid is non-toxic and can be used for vinyl acetate latex in contact with food. This product is a fine chemical intermediate such as medicine and optical bleach. It is used in the production of antidote dimercaptosuccinic acid in the pharmaceutical industry. It neutralizes fumaric acid with sodium carbonate to obtain sodium fumaric acid ([17013-01-3]), and then replaces it with ferrous sulfate to obtain iron fumaric acid. It is a drug rich in blood iron for the treatment of small red blood cell anemia.

As a food additive, this product is used in cool drinks, fruit candy, jelly, ice cream, etc. it is mostly used in combination with citric acid. The monosodium salt made by the reaction of fumaric acid and sodium hydroxide is also used as sour condiment and as an intermediate of synthetic resin and dye.