38210010000 under HS Code Others, 84212119000 under HS Code Others, and 39169070000 under HS Code MONOFILAMENT OF WHICH ANY CROSS - SECTIONAL DIMENSION EXCEEDS 1MM, RODS, STICKS AND PROFILE SHAPES, WHETHER OR NOT SURFACE - WORKED BUT NOT OTHERWISE WORKED, OF PLASTICS - OF OTHER PLASTICS : OF CELLULOSE ACETATE AND ACETATE BUTYRATE, WHETHER OR NOT PLASTICIZED were the top imported HS Codes by MEMBRANE SEPARATION TECHNOLOGY MST in 2021.