Hydroxyethyl Cellulose (HEC) for Oil Well Drilling and Water-Based Drilling Fluids Company Profile Shanghai Prior Chemical Scientific And Technical Co., Ltd. (Grade A Tax Credit) was established in 2016 and specializes in the supply and international trade of industrial chemicals and specialty materials. Leveraging resources associated with China North Industries Group Corporation (NORINCO GROUP), the company supplies a broad range of cellulose and specialty chemicals,