Fumaric Acid Food Grade 99.5% It is used as Feed acidification agent, Acidity regulator, Food preservative Fumaric Acid Tech Grade 99. ... paint and coating, Feed acidification agent, Acidity regulator, Food preservative, etc. Specification: ParameterGradeFumaric AcidTechnical FoodPurity ≥ 99 ... PPM ≤33Ash % ≤0.03 Packing: In 25kg polypropylene plastic woven bags with inner polyethylene plastic bags.