we , shandong xinghui chemical co., ltd is a manufacturer of the following product: 1: nitromethane: 99%, 99.5%, 99.9% 2:hydroxylamine hydrochloride: 98%, 99% 3:dimethyl sulfate: 98.5%, 99% 4: calcium formate:98% 5: methyl p-tolyl sulfone: 98%, 99% 6: p-toluene sulfinic acid sodium salt(spts) this product are used in chemicals and dyestuff, if you have any demand of our product, please do not hesitate to contact with us, wish to cooperate with you in the future.