Extruding HEC Food Grade Suspending and Thickening Hydroxy Ethyl Cellulose Company Profile Shanghai Prior Chemical Scientific And Technical Co.LTD. (Grade A Tax Credit) was established in 2016. Leveraging China North Industries Group Corporation (NORINCO GROUP) resources, the company trades -industrial materials including hydroxyethyl cellulose (HEC), hydroxypropyl methyl cellulose (HPMC), sodium carboxymethyl cellulose (CMC), ethyl cellulose (EC), and nitrocellulose (NC).