---
title: "HSN Code for Sodium Hydroxide (Caustic Soda) | HSN 28121100 GST Rate"
description: "Find HSN and GST Rates for 28121100 related to Sodium Hydroxide (Caustic Soda) with BUSY Accounting - The reliable source for HSN and GST details in India."
canonical: "https://busy.in/hsn/hsn-28121100/"
---

# HSN Code 28121100: Sodium Hydroxide (Caustic Soda)

- [Section 06: Guide to HSN Section 06](https://busy.in/hsn/section-06/)
- [Chapter 28: Inorganic Chemicals & Rare-Earth Metal Compounds](https://busy.in/hsn/chapter-28/)
- [Sub-chapter 2812: Halides & halide oxides of non-metals](https://busy.in/hsn/sub-chapter-2812/)

## GST rates

| Description | CGST | SGST | IGST | CESS |
| --- | --- | --- | --- | --- |
| HALOGEN OR SULPHUR COMPOUNDS OF NON-METALS : Chlorides and chloride oxides : Carbonyl dichloride (phosgene) | 9% | 9% | 18% | 0% |

## Frequently asked questions

### What products are classified under HSN 28121100 ?

It includes Sodium Hydroxide (Caustic Soda)

### Any common misclassification issue with Sodium Hydroxide (Caustic Soda)?

Use the exact HSN and describe the form/grade. For multi‑line invoices, apply the rate per line to avoid wrong tax collection.

### Do e‑way bill and e‑invoice apply for Sodium Hydroxide (Caustic Soda)?

e‑Way bill is needed above ₹50,000 consignment value (subject to exemptions). e‑Invoicing is turnover‑based (presently AATO > ₹5 crore) for B2B supplies.

### Can we claim ITC on inputs used to trade Sodium Hydroxide (Caustic Soda)?

If your outward supply is taxable, eligible ITC is available subject to general restrictions. For exempt/Nil supplies, reverse credit per Rule 42.

### Does packaging or labelling change the GST for Sodium Hydroxide (Caustic Soda)?

For food/agri items, GST can be 5% when not fresh/chilled and sold as pre‑packaged & labelled; otherwise often Nil. For non‑food items, rates depend on the specific sub‑heading.

### How much GST applies to Sodium Hydroxide (Caustic Soda)?

Under HSN 28121100, Sodium Hydroxide (Caustic Soda) attracts Varies when sold in taxable form. Describe the exact form on the invoice.