... under normal conditions, HygroscopicSpecification sheet:Item StandardAssay(C5H6O4) 99.5% minResidue on ignition 0.030% maxLoss on drying ... 0.300% maxHeavy metal(Pb) 10 ppm maxFe 5 ppm maxSulfate 30 ppm maxChloride 10 ppm maxCu 1 ... ppm maxMn 1 ppm maxAs 4 ppm maxColor(5%aqueous solution) 5 max(Pt-Co)Melting point 165-168 ... , Asia,Europe itaconic acid,Methylenesuccinic acid,99.5%,Competitive offer