... .5%Arsenic: 3ppm max Heavy metals(Pb): 10ppm max Maleic acid: 0.1% max Residue on ignition: 0.1% max moisture ... : 0.5% max Usage: Food grade fumaric acid as chemical intermediate --an acid and acidifier, widely used in the preparation of ... carbonated beverages, ice cream etc., can override Malic acid and citric acid acting as food preservative, preservatives, antioxidants etc.. Its acidity ...