Q3HSN Code 2815
Sodium hydroxide (caustic soda), potassium hydroxide
Sodium hydroxide (caustic soda), potassium hydroxide (caustic potash), peroxides of sodium or potassium
GST rate
| Thorium oxalate, Enriched KBF4 (enriched potassium fluroborate), Enriched elemental boron, Nuclear fuel | 5% |
| Anaesthetics, Potassium Iodate, Iodine, Steam | 5% |
| Micronutrients, which are covered under serial number 1(g) of Schedule 1, Part (A) of the Fertilizer Control Order, 1985 and are manufactured by the manufacturers which are registered under the Fertilizer Control Order, 1985 | 5% |
| All inorganic chemicals [other than those specified in notification th No.10/2025- Central Tax (Rate) dated 17 September 2025 or other Schedules of this notification] | 18% |
Codes under 2815
| Code | Description | GST rate |
|---|---|---|
| 2815 11 | Solid: | Varies |
| 2815 11 10 | Flakes | Varies |
| 2815 12 | Aqueous solution (soda lye or liquid soda) — sodium hydroxide (caustic soda), potassium hydroxide (caustic potash), peroxides of sodium or potassium | Varies |
| 2815 20 | Potassium hydroxide (caustic potash) | Varies |
| 2815 30 | Peroxides of sodium or potassium | Varies |
← Chapter 28: Industrial gases and inorganic chemicals
Related HSN codes
Frequently Asked Questions
What is the HSN code for sodium hydroxide (caustic soda), potassium hydroxide?
The HSN code for sodium hydroxide (caustic soda), potassium hydroxide is 2815, under Chapter 28 (Industrial gases and inorganic chemicals).
What is the GST rate on sodium hydroxide (caustic soda), potassium hydroxide?
It depends on the specific item: thorium oxalate, enriched kbf4 (enriched potassium fluroborate), enriched elemental boron, nuclear fuel is 5%; anaesthetics, potassium iodate, iodine, steam is 5%; micronutrients, which are covered under serial number 1(g) of schedule 1, part (a) of the fertilizer control order, 1985 and are manufactured by the manufacturers which are registered under the fertilizer control order, 1985 is 5%; all inorganic chemicals [other than those specified in notification th no.10/2025- central tax (rate) dated 17 september 2025 or other schedules of this notification] is 18%.
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.