HSN code 38121000 is the 8-digit tariff item for prepared rubber accelerators, under heading 3812 and sub-heading 381210 (Chapter 38). GST is 18%: 9% CGST + 9% SGST within a state, or 18% IGST to another state. Rates as of 2026-10-21.
HSN 38121000 at a glance
| Tariff item (8 digits) | 38121000 |
|---|---|
| Heading (4 digits) | 3812: Prepared rubber accelerators; compound plasticisers for rubber or plastics, not elsewhere specified or included; anti-oxidising preparations and other compound stabilisers for rubber or plastics |
| Sub-heading (6 digits) | 381210: Prepared rubber accelerators |
| Chapter | 38: Miscellaneous chemical products |
| Description | Prepared rubber accelerators |
| GST rate | 18% |
| Within the state | 9% CGST + 9% SGST (or UTGST) |
| To another state | 18% IGST |
9/2025-CT(R), Schedule II, S. No. 99 (HSN 3812) covers "Prepared rubber accelerators; compound plasticisers for rubber or plastics, not elsewhere specified or included; anti-oxidising preparations and other..." at 18%. Goods of this code outside that wording fall under the 18% residual entry, so the rate is 18% either way.
The rate entry for this code
The description is the notification's own wording. An entry applies only when the goods match it.
| HSN scope | Description of goods | GST | CGST + SGST | Entry |
|---|---|---|---|---|
| 3812 | Prepared rubber accelerators; compound plasticisers for rubber or plastics, not elsewhere specified or included; anti-oxidising preparations and other compound stabilisers for rubber or plastics such as vulcanizing agents for rubber | 18% | 9% + 9% | 9/2025-CT(R), Schedule II, S. No. 99 |
| Any | Goods which are not specified in Schedule I, III, IV, V, VI or VII (residual entry, for goods of 38121000 that match none of the descriptions above) | 18% | 9% + 9% | 9/2025-CT(R), Schedule II, S. No. 639 |
Worked example: a ₹1,000 sale under HSN 38121000
Taxable value ₹1,000.00. Within your state: CGST ₹90.00 + SGST ₹90.00 = ₹180.00, invoice total ₹1,180.00. To a buyer in another state: IGST ₹180.00, the same total.
For other amounts, or to work back from a tax-inclusive price, use the GST calculator.
How many HSN digits to print on the invoice
Notification 78/2020-Central Tax sets the minimum by aggregate turnover in the previous financial year: up to ₹5 crore, at least 4 digits (3812) on tax invoices to registered buyers (optional on B2C invoices); above ₹5 crore, at least 6 digits (381210) on all tax invoices. Exports and imports are declared on the shipping bill or bill of entry under the full 8-digit tariff item (38121000), so most exporters print 8 digits on their GST invoices too.
The HSN-wise summary in GSTR-1 uses the same code, so set it once on the item in your billing software. FundRaksha Book stores the HSN and GST rate on each item, splits CGST, SGST and IGST on every bill, and keeps stock and party ledgers alongside.
Other tariff items under heading 3812
- HSN 38122010: Phthalate plasticisers (compound plasticisers for rubber or plastics) (18%)
- HSN 38122090: Compound plasticisers for rubber or plastics: other (18%)
- HSN 38123010: Anti-oxidants for rubber (anti-oxidising preparations and other compound stabilisers for rubber or plastics) (18%)
- HSN 38123020: Softeners for rubber (anti-oxidising preparations and other compound stabilisers for rubber or plastics) (18%)
- HSN 38123030: Vulcanising agents for rubber (anti-oxidising preparations and other compound stabilisers for rubber or... (18%)
- HSN 38123090: Anti-oxidising preparations and other compound stabilisers for rubber or plastics: other (18%)
- HSN 38123100: Mixtures of oligomers of 2, 2, 4-trimethyl-1, 2 dihydroquinoline (tmq) (18%)
- HSN 38123910: Anti-oxidants for rubber (prepared rubber accelerators) (18%)
- HSN 38123920: Softeners for rubber (prepared rubber accelerators) (18%)
- HSN 38123930: Vulcanizing agents for rubber (prepared rubber accelerators) (18%)
See every rate entry for the heading on the HSN 3812 page, or all Chapter 38 headings.
Sources
Codes and descriptions: GSTN HSN master (HSN_SAC.xlsx, sheet HSN_MSTR), GST portal, file dated 13.10.2026, read on 21.10.2026; descriptions were converted from capitals and joined with their heading and sub-heading text. Rates: Rates from Notification 9/2025-Central Tax (Rate), 17.09.2025, as amended by Notification 19/2025-Central Tax (Rate) (from 01.02.2026) and Notification 01/2026-Central Tax (Rate) (from 01.05.2026); nil-rated goods from Notification 10/2025-Central Tax (Rate); bricks from Notification 14/2025-Central Tax (Rate).