GST HSN Code for Block Joining Mortar Clarified by West Bengal AAR
West Bengal AAR ruled that polymer-modified block joining mortar falls under HSN code 3214 90 90 under Schedule IV.
- Ruling
- 01/WBAAR/2018-19 dated 09/04/2018
- Dated
- 09 Apr 2018
- Authority
- Authority for Advance Ruling
This page was written by Patron Accounting’s AI from the official release and reviewed before publishing. It explains the document in plain language. It is not the document itself. Where this page and the original differ, the original governs.
The short version
- Company asked for HSN classification of polymer-modified block joining mortar.
- Authority classified block joining mortar under HSN tariff item 3214 90 90.
- Tax applies under Schedule IV of Notification No. 01/2017-Central Tax (Rate).
- General chemical HSN 3824 cannot be used when Heading 3214 applies.
In short
M/s. Sika India Pvt Ltd asked the West Bengal Authority for Advance Ruling (WBAAR) to clarify the HSN code and GST rate for its product, SIKA Block Joining Mortar. The company argued that the product should be classified under HSN 3824 50 90 as a general chemical product. The tax authority examined whether the powdered mortar, which is mixed with water to form a paste for fixing AAC blocks and fly ash bricks, properly belongs under Heading 3214.
What has changed
How it worked before
Businesses often assumed block joining mortars could be classified under general chemical preparations under HSN 3824 or under HSN 3214 90 10 based on old central excise practice.
What has changed
The authority ruled that SIKA Block Joining Mortar falls under HSN tariff item 3214 90 90. Heading 3214 specifically covers preparations in powder form made pasty at the time of use to bond or join components together. The tax authority stated that residual chemical code HSN 3824 applies only to products not covered elsewhere, so it cannot be used when Heading 3214 applies.
Who this affects
Manufacturers and sellers of cement-based mortars, block joining adhesives, and polymer-modified construction chemicals.
An example
A construction chemical firm in West Bengal manufactures powdered mortar to join fly ash bricks. The owner classifies the product under HSN 3824 as a general chemical mixture to claim a different tax treatment. Based on order 01/WBAAR/2018-19, tax authorities would consider this product to fit under HSN 3214 90 90 because it is a preparation mixed with water to bond building blocks. The firm would need to evaluate whether to adjust its HSN classification or seek its own ruling.
What you should do
Review the HSN codes used for your mortar and adhesive products to ensure they match specific product descriptions rather than general chemical codes. Remember that this advance ruling order 01/WBAAR/2018-19 is legally binding only on the company that applied and its local tax office. If you want certainty for your own products, you must file a separate application for an advance ruling.
If you do nothing
If you rely on a general chemical code like HSN 3824 instead of a specific heading like 3214, tax officers may reclassify your product during an audit. This can lead to demands for short-paid tax, along with interest and late penalties. You cannot automatically use another company's ruling to stop your tax officer from issuing a demand.
The terms explained
- HSN Code
- An international standard numerical code used to group and identify products for tax calculation.
- Advance Ruling
- An official tax decision given by an authority to a specific business about how tax rules apply to its situation.
- Schedule IV
- A specific listing in GST rate notifications that groups certain goods subject to a designated tax rate.
The ruling in detail
Authority for Advance Ruling
SIKA India Pvt Ltd
01/WBAAR/2018-19 dated 09/04/2018 · West Bengal
Questions before the authority
- What is the proper HSN classification and applicable tax rate for the manufactured product SIKA Block Joining Mortar?
Facts
The Applicant manufactures 'SIKA Block Joining Mortar', a ready-to-use grey cement-based water-resistant mortar modified with polymers used for fixing AAC blocks and fly ash bricks. Supplied in powdered form in 30 kg bags, it is mixed with water to form a pasty compound before application with a trowel. The Applicant claimed classification under HSN 3824 50 90, whereas under Central Excise it was previously classified under HSN 3214 90 10.
Ruling
| Question | What the authority ruled |
|---|---|
| Classification of SIKA Block Joining Mortar | Tariff item 3214 90 90, taxable under Serial No. 24 of Schedule IV |
The Authority ruled that 'SIKA Block Joining Mortar' is to be classified under **tariff item 3214 90 90** of the Customs Tariff Act, 1975. Accordingly, it is taxable under serial no. 24 of Schedule IV vide Notification No. 01/2017-Central Tax (Rate) dated 28/06/2017.
Reasoning
The Authority referred to the Explanatory Notes to the Harmonised Commodity Description and Coding System (WCO) to interpret Heading 3214, which covers powdered preparations made pasty at the time of use to bond or join components together. Since 'SIKA Block Joining Mortar' satisfies the general characteristics of Heading 3214 but is not a non-refractory surfacing preparation under 3214 90 10, it falls under the residual entry 3214 90 90. Heading 3824 applies only to chemical products 'not elsewhere specified or included', and since the product is explicitly covered under Heading 3214, Heading 3824 cannot be invoked.
Provisions relied on
- Section 97(2)(a) of the CGST Act, 2017
- Section 97(2)(e) of the CGST Act, 2017
- Heading 3214 of the Customs Tariff Act, 1975
- Heading 3824 of the Customs Tariff Act, 1975
- Notification No. 01/2017-Central Tax (Rate) dated 28/06/2017
- Notification No. 1125-FT dated 28/06/2017
For the practitioner
This ruling establishes that polymer-modified block joining mortars fall under **residual tariff item 3214 90 90** rather than the general residual chemical heading 3824. Practitioners should note that HSN 3824 cannot be claimed as a fallback when a product satisfies the general characteristics of preparations described under Heading 3214.
Source
This is a summary prepared from the published order, which is a scanned document. It is a reading aid and not the authority: where the two differ, the order governs. Verify every provision against the original before relying on it.
Original order: https://www.gstcouncil.gov.in/sites/default/files/AAR/01-wbaar-18-19_west_bengal.pdf
Legibility of the scan, as read: high.
Prepared 17-10-2026.
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