... Heavy metals, %: ≤ 10. 2)The uses of medical-grade DMSO: mainly used as solvent in pharmaceuticaland intermediate synthesis reaction, as ... reactant.The quality and technical index:Item Index StandardContent(as DMSO), %: ≥ 99.9 Crystallization point, : ≥ 18.3 Refractive index ... reactant.The quality and technical index:Item Index StandardContent(as DMSO), %: ≥ 99.9 Crystallization point, : ≥ 18.35 Acid ...