Potassium carbonates

Potassium carbonates for industrial and chemical use

BIS QCO APPLICABLE · ISI MARK SCHEME · IS 7129

HSN 2836 40 00 (Potassium carbonates) is covered by a Bureau of Indian Standards Quality Control Order. Conformity to IS 7129:1992 (reaffirmed 2015) is mandatory under the ISI Mark Scheme with effect from 13 March 2024, by virtue of the Potassium Carbonate (Quality Control) Order, 2020. Mandatory additional qualifiers in import declarations for Chapter 28 commodities, administered by the Central Board of Indirect Taxes and Customs, apply as a separate customs-clearance overlay.

What this is

HSN code

2836 40 00

Chapter

28 · Inorganic chemicals; organic or inorganic compounds of precious metals

BIS QCO

Applicable · ISI Mark Scheme · CM/L required

Indian Standard

IS 7129:1992 · effective 13-03-2024

Applicable Partner Government Agencies

BISBIS·Bureau of Indian Standards

Procedural directions for customs clearance are issued by: Central Board of Indirect Taxes and Customs.

Compliance steps

1
Source only from a Bureau of Indian Standards CM/L-licensed manufacturer holding a current licence against IS 7129:1992 (reaffirmed 2015). Verify the supplier's CM/L number, licensed product scope, and licensed manufacturing facility on the BIS online register before placing the purchase order.
Potassium Carbonate (Quality Control) Order, 2020 · S.O. 1895(E) dated 16-06-2020 · S.O. 3298(E) dated 21-07-2023
2
Ensure each consignment bears the ISI standard mark and the supplier's CM/L number, applied under Scheme-I of Schedule-II to the BIS (Conformity Assessment) Regulations, 2018. Marking must appear on the product or its immediate container, not on outer packaging alone.
Scheme-I of Schedule-II to the BIS (Conformity Assessment) Regulations, 2018 · Potassium Carbonate (Quality Control) Order, 2020
3
Include mandatory additional qualifiers in the import declaration for Chapter 28 commodities with effect from 15 October 2023. Verify the specific qualifier fields required under paragraphs 4.1 and 4.2 of CBIC Circular 23/2023-Cus and ensure they are populated correctly in the bill of entry before filing.
CBIC Circular 23/2023-Cus dated 30-09-2023 · General Note 2 of the ITC (HS) Import Policy
4
If the bill of entry is PGA-facilitated but not routed through the PGA for a No Objection Certificate, upload the registration certificate (Drugs) and import licence for drugs in e-Sanchit before the consignment receives out-of-charge. Customs will verify these documents prior to release.
CCR mandatory document codes 101DC1 and 9111DC · e-Sanchit filing requirement per Customs Act, 1962
5
Quote the supplier's BIS CM/L number on the bill of entry, supported by the ISI-marked goods documentation. Customs verifies the CM/L in real time against the BIS register; an absent, expired, or scope-mismatched licence triggers consignment detention.
Potassium Carbonate (Quality Control) Order, 2020 · S.O. 1895(E) · BIS Act, 2016 · Customs Act, 1962

A word of counsel

The single most common error on this tariff line is treating the IS 7129:1992 version year as a legacy standard superseded by a more recent revision. The QCO notification under S.O. 1895(E) as amended by S.O. 3298(E) expressly maps to IS 7129:1992 reaffirmed 2015 — a reaffirmed standard, not a new edition — and suppliers holding CM/L licences referencing a different version or year face scope mismatch at port. Confirm the exact standard version on the CM/L certificate before shipment, not at the bill-of-entry stage.

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Frequently asked

Does HSN 2836 40 00 require BIS certification?

Yes. Conformity to IS 7129:1992 (reaffirmed 2015) is mandatory under the ISI Mark Scheme with effect from 13 March 2024, by virtue of the Potassium Carbonate (Quality Control) Order, 2020; import is permitted only from manufacturers holding a current BIS CM/L licence.

Are mandatory additional qualifiers required in the import declaration for this HSN?

Yes. CBIC Circular 23/2023-Cus dated 30 September 2023 requires mandatory additional qualifiers in import declarations for all Chapter 28 commodities with effect from 15 October 2023; failure to populate the prescribed fields results in the bill of entry being flagged for manual examination.

What document obligations apply if the bill of entry is PGA-facilitated but not routed for a No Objection Certificate?

The registration certificate (Drugs) and import licence for drugs must be uploaded in e-Sanchit before out-of-charge. The proper officer will verify these documents are present before releasing the consignment.

Does a single CM/L licence cover all grades and purity levels of potassium carbonate?

No. A CM/L licence is scope-specific by product grade and manufacturing facility; grades or specifications outside the licensed scope, or production from an unlicensed plant, are not covered under the licence.

Last verified against gazette notifications: 2026-05-18. Source: BIS / CBIC / Indian Customs CUSDATA.