Other

Residual organo-inorganic compounds, other than listed

NDPS CLEARANCE

HSN 2931 90 90 (Other organo-inorganic compounds) is subject to control under the Narcotic Drugs and Psychotropic Substances (NDPS) regime and, where the goods fall within Schedule 1 Category 1A of the Chemical Weapons Convention (CWC), to mandatory prior permission from the National Authority, CWC, under Section 15 of the Chemical Weapons Convention Act, 2000. The Central Board of Indirect Taxes and Customs (CBIC) additionally requires mandatory Chapter 29 qualifiers in the import declaration under CBIC Circular 23/2023-Cus dated 30-09-2023.

What this is

HSN code

2931 90 90

Chapter

29 · Organic chemicals

Primary regulator

NDPS · Narcotic Drugs and Psychotropic Substances Act, with CWC National Authority permission under Chemical Weapons Convention Act, 2000

Customs documentation

Permission from CWC National Authority
NDPS schedule compliance certificate
Chapter 29 qualifiers from CBIC

Applicable Partner Government Agencies

NDPSNDPS·Narcotics Control Bureau

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

Compliance steps

1
Before filing the bill of entry, verify whether the specific organo-inorganic compound falls within Schedule 1, Category 1A of the CWC (including phosphonofluoridates, phosphoramidocyanidates, phosphonothiolates, phosphonyldifluorides, and related alkylated or protonated salts). If so, obtain prior permission from the National Authority, CWC, under Section 15 of the Chemical Weapons Convention Act, 2000; import without such permission is not permitted.
Section 15, Chemical Weapons Convention Act, 2000 · S.O. 1459(E) dated 12-05-2020, Dept. of Chemicals and Petrochemicals
2
Verify the applicability of the NDPS schedule and, where applicable, the insecticide schedule to the specific compound being imported, and ensure all required NDPS clearances are in place before the bill of entry is presented for out-of-charge.
NDPS schedule verification requirement per regulatory record CCR · CBIC Circular 23/2023-Cus dated 30-09-2023
3
Comply with mandatory additional qualifiers in the import declaration for commodities under Chapter 29 as stipulated in paragraphs 4.1 and 4.2 of CBIC Circular 23/2023-Cus, with effect from 15 October 2023. Incomplete or absent qualifiers will result in bill-of-entry rejection or detention of the consignment.
CBIC Circular 23/2023-Cus dated 30-09-2023, paras 4.1 and 4.2

A word of counsel

The most common error on this tariff line is treating the CWC Schedule 1 Category 1A restriction as applying only to named agents (Sarin, Soman, VX) and overlooking the combinatorial scope clause: all chemicals possible from all possible combinations of the listed alkyl groups in parentheses are considered prohibited unless explicitly exempted. A compound that does not bear a common-name designation but is synthesisable within the listed alkyl-group matrix is still restricted, and import without National Authority permission attracts confiscation and criminal liability under the Chemical Weapons Convention Act, 2000.

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Frequently asked

Does HSN 2931 90 90 require BIS certification?

No, this residual organo-inorganic compounds tariff line is not covered by any BIS Quality Control Order. Import is governed by the NDPS regime and, for CWC Schedule 1 Category 1A substances, by mandatory prior permission from the National Authority, CWC, under Section 15 of the Chemical Weapons Convention Act, 2000.

Do the Chapter 29 mandatory qualifiers under CBIC Circular 23/2023-Cus apply to every shipment under this HSN?

Yes. CBIC Circular 23/2023-Cus dated 30-09-2023 requires mandatory additional qualifiers in import declarations for all commodities under Chapter 29 from 15 October 2023; failure to include the required qualifiers at paragraphs 4.1 and 4.2 will cause bill-of-entry rejection or consignment detention.

How is the CWC Category 1A combinatorial prohibition applied when the specific compound has no common name?

Per the regulatory record CCR, all chemicals achievable by any combination of the alkyl groups listed in parentheses in the Schedule 1 Category 1A entries are considered prohibited unless explicitly exempted, regardless of whether the compound bears a recognised common name; the importer must obtain National Authority, CWC, permission before import.

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