Dithionites

Dithionites, sodium and zinc dithionite salts

CBIC CLEARANCE

HSN 2831 90 10 (Dithionites) is subject to mandatory declaration qualifiers under Chapter 28 of the ITC (HS) import policy, administered by the Central Board of Indirect Taxes and Customs (CBIC). With effect from 15 October 2023, importers must comply with the additional qualifier requirements for chemical commodities stipulated in CBIC Circular 23/2023-Cus dated 30-09-2023.

What this is

HSN code

2831 90 10

Chapter

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

Primary regulator

CBIC · Chapter 28 mandatory qualifiers, CBIC Circular 23/2023-Cus

Customs documentation

Chapter 28 qualifiers from CBIC
Import declaration from CBIC

Compliance steps

1
Ensure the import declaration for HSN 2831 90 10 includes all mandatory additional qualifiers for Chapter 28 commodities as stipulated in paragraphs 4.1 and 4.2 of CBIC Circular 23/2023-Cus. These qualifiers are compulsory at the bill-of-entry stage with effect from 15 October 2023.
CBIC Circular 23/2023-Cus dated 30-09-2023, paras 4.1 and 4.2
2
Verify that the qualifier declarations are accurate and match the accompanying commercial documents. Incomplete or incorrect qualifier entries may result in consignment detention and examination by the proper officer pending rectification.
CBIC Circular 23/2023-Cus dated 30-09-2023

A word of counsel

The most common error on this tariff line is filing the bill of entry without the Chapter 28 mandatory qualifiers — treating them as optional supplementary data rather than a compulsory declaration requirement operative from 15 October 2023. A bill of entry that omits or partially fills the qualifier fields under paragraphs 4.1 and 4.2 of CBIC Circular 23/2023-Cus is liable to examination and detention until the deficiency is remedied.

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Frequently asked

Does HSN 2831 90 10 require BIS certification?

No, dithionites under this tariff line are not subject to any BIS Quality Control Order. The operative compliance requirement is the mandatory Chapter 28 declaration qualifier under CBIC Circular 23/2023-Cus dated 30-09-2023, administered by the Central Board of Indirect Taxes and Customs.

From which date are the Chapter 28 mandatory qualifiers enforceable for this HSN?

The mandatory additional qualifiers for commodities under Chapter 28 are operative with effect from 15 October 2023, as stipulated in CBIC Circular 23/2023-Cus dated 30-09-2023.

Do the same qualifier requirements apply to other chemical chapters imported alongside this HSN?

Yes. CBIC Circular 23/2023-Cus extends the mandatory qualifier requirement to commodities under Chapters 28, 29, 32, 39 and CTH 3808, so a consolidated shipment covering multiple chemical chapters must carry compliant qualifiers for each applicable CTI.

Last verified against gazette notifications: 2026-05-16. Source: CBIC / Indian Customs CUSDATA.