HS Heading 3913
Natural polymers (e.g. alginic acid) and modified natural polymers (e.g. hardened proteins, chemical derivatives of natural rubber), n.e.c. or included, in primary forms
2 tariff lines in this heading, within chapter 39 (Plastics and articles thereof). Click any HS code for the full breakdown and a duty calculation.
| HS Code | Description | CD | SD | VAT | AIT | RD | AT | TTI |
|---|---|---|---|---|---|---|---|---|
| 39131000 | Alginic Acid, Its Salts And Esters, In Primary Forms | 5 | 0 | 15 | 5 | 0 | 7.5 | 33.63% |
| 39139000 | Natural and modified natural polymers, in primary forms | 5 | 0 | 15 | 5 | 0 | 7.5 | 33.63% |
Recorded imports
Between December 2025 and May 2026, NBR recorded commercial imports worth BDT 1,389,887,685 (3,896,287 kg) under this heading, across 2 of its 2 tariff lines.
| Month | Lines with imports | Net weight | Assessable value |
|---|---|---|---|
| December 2025 | 2 | 487,882 kg | BDT 265,380,023 |
| January 2026 | 2 | 443,305 kg | BDT 186,514,278 |
| February 2026 | 2 | 581,299 kg | BDT 127,799,189 |
| March 2026 | 2 | 560,813 kg | BDT 389,373,629 |
| April 2026 | 2 | 920,340 kg | BDT 276,085,963 |
| May 2026 | 2 | 902,648 kg | BDT 144,734,603 |
The largest lines by assessable value in May 2026:
Bonded imports. A further BDT 123,494,223 (160,334 kg) entered under the bonded-warehouse regime over the same months — duty-free inputs imported against an undertaking to re-export them. That is 8.2% of the total value imported under this heading.
Import figures: NBR Import Statements (IM-4 commercial, IM-7 bonded), December 2025 – May 2026. Assessable value is the customs value on which duty is charged, not the retail or invoice price.