Q3HSN Code 3913
Natural polymers (for example, alginic acid) and modified
Natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms
GST rate
18%
Codes under 3913
| Code | Description | GST rate |
|---|---|---|
| 3913 10 | Alginic acid, its salts and esters: | 18% |
| 3913 10 10 | Sodium alginate | 18% |
| 3913 90 | Natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms › Other | 18% |
| 3913 90 11 | Chlorinated rubber | 18% |
| 3913 90 20 | Hardened proteins (such as hardened casein, gelatin) | 18% |
| 3913 90 30 | Dextran | 18% |
← Chapter 39: Plastics and plastic articles
Related HSN codes
3914Ion–exchangers based on polymers of headings 3901 to 39133912Cellulose and its chemical derivatives, not elsewhere3915Waste, parings and scrap, of plastics3911Petroleum resins, coumarone-indene resins, polyterpenes3916Monofilament of which any cross-sectional dimension exceeds3910Silicones in primary forms
Frequently Asked Questions
What is the HSN code for natural polymers (for example, alginic acid) and modified?
The HSN code for natural polymers (for example, alginic acid) and modified is 3913, under Chapter 39 (Plastics and plastic articles).
What is the GST rate on natural polymers (for example, alginic acid) and modified?
Natural polymers (for example, alginic acid) and modified is taxed at 18% GST under HSN code 3913.
How many digits of the HSN code go on a GST invoice?
It depends on your turnover in the previous financial year: businesses above ₹5 crore generally show 6 digits (8 for certain specified goods), and smaller businesses show 4 digits on B2B invoices. Check the current e-invoicing/HSN notification for the exact threshold that applies to you.
Rates as per Notification No. 9/2025-Central Tax (Rate), as amended, as of 7 October 2026. For guidance only — verify with your tax advisor.