Shandong Zhengtongyuan International Trading Co., Ltd. is a professional importing and exporting company.We have Four factories in Shandong Tianjin and Shanghai.We specialize in Plastic & Chemical products(Food Additives). Our Chemical products include Food Additives and medicine Intermediate,such as Sodium Propionate,Calcium Propionate,Sodium Benzoate,Sodium Matabisulfite,Silicon Dioxide,Ammonium Bicarbonate,L-Arabinose,Xylitol,2-Deoxy-L-Ribose,Sodium Gluconate,MMTD,MTD,MMT,MethI ...