2907120000 under HS Code Others, 2917140000 under HS Code POLYCARBOXYLIC ACIDS, THEIR ANHYDRIDES, HALIDES, PEROXIDES AND PEROXYACIDS; THEIR HALOGENATED, SULPHONATED, NITRATED OR NITROSATED DERIVATIVES - ACYCLIC POLYCARBOXYLIC ACIDS, THEIR ANHYDRIDES, HALIDES, PEROXIDES, PEROXYACIDS AND THEIR DERIVATIVES : MALEIC ANHYDRIDE, and 3925100000 under HS Code BUILDERS WARE OF PLASTICS, NOT ELSEWHERE SPECIFIED OR INCLUDED - RESERVOIRS, TANKS, VATS AND SIMILAR CONTAINERS, OF A CAPACITY EXCEEDING 300 L were the top imported HS Codes by OJSC STERLITAMAK PETROCHEMICAL PLANT in 2021.