Containing a phosphorus atom to which one methyl, ethyl, n-propyl or isopropyl group is bonded but no further carbon atoms

Organo-phosphorus compounds, limited alkyl substitution (methylphosphonyl dichloride, dimethyl methylphosphonate)

DGFT CLEARANCE · CBIC CLEARANCE

HSN 2931 49 91 covers organo-phosphorus compounds bearing one methyl, ethyl, n-propyl or isopropyl group and no further carbon atoms — a product family classified as Schedule 1 chemicals under the Chemical Weapons Convention (CWC), and import is administered by the Directorate General of Foreign Trade (DGFT) under DGFT Notification 44/2025-26 dated 15-10-2025. Category 1B chemicals within this family (such as fonofos) may be imported only from State Parties to the CWC, with mandatory post-import notification to the National Authority, CWC, Cabinet Secretariat, Ministry of External Affairs. Central Board of Indirect Taxes and Customs (CBIC) Circular 23/2023-Cus mandatory Chapter 29 additional qualifiers and Public Liability Insurance Act, 1991 obligations apply as concurrent overlays.

What this is

HSN code

2931 49 91

Chapter

29 · Organic chemicals

Primary regulator

DGFT · ITC (HS) import policy, Chapter 29; CWC Schedule 1 notification regime

Customs documentation

Import declaration from DGFT
Chapter 29 qualifiers from CBIC
CWC notification copy from importer

Compliance steps

1
Confirm the specific compound is either a Schedule 1 general entry (import free per DGFT Notification 44/2025-26) or a Category 1B chemical (e.g. fonofos). For Category 1B chemicals, import is restricted to shipments originating exclusively from State Parties to the Chemical Weapons Convention; obtain documentary proof of origin from a CWC State Party before the bill of entry is filed.
DGFT Notification 44/2025-26 dated 15-10-2025 · Finance Bill 2025 w.e.f. 01-05-2025
2
Within 30 days of import, notify consignment details to the National Authority CWC, Cabinet Secretariat, Ministry of External Affairs (D&ISA), the Department of Chemicals and Petrochemicals, and DGFT, and submit a copy of the bill of entry to DGFT. Failure to file within the 30-day window constitutes a CWC-regime violation independent of customs clearance.
DGFT Notification 44/2025-26 dated 15-10-2025 · ITC (HS) CWC Schedule 1 notification requirements
3
Ensure the import declaration includes the mandatory additional qualifiers for Chapter 29 commodities as stipulated in Paragraphs 4.1 and 4.2 of CBIC Circular 23/2023-Cus, effective 15-10-2023. Where the hazardous substance quantity exceeds specified thresholds, take out a Public Liability Insurance policy under the provisions of the PLI Act, 1991 per S.O. 227(E) dated 24-03-1992.
CBIC Circular 23/2023-Cus dated 30-09-2023 · S.O. 227(E) dated 24-03-1992 (MoEF)

A word of counsel

The single most common error on this tariff line is treating the general 'import free' status under DGFT Notification 44/2025-26 as applying uniformly to every compound under 2931 49 91, without checking whether the specific substance falls within the Category 1B carve-out. Category 1B chemicals such as fonofos are subject to CWC State Party origin restriction and the 30-day post-import notification obligation — both of which survive customs out-of-charge and create a continuing compliance obligation enforceable by DGFT and the National Authority, CWC.

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Frequently asked

Does HSN 2931 49 91 require BIS certification?

No, organo-phosphorus compounds under this tariff line are not subject to any BIS Quality Control Order. Import is governed by the Directorate General of Foreign Trade under DGFT Notification 44/2025-26, with CWC Schedule 1 notification obligations and CBIC Chapter 29 mandatory-qualifier requirements applying at the bill of entry.

What is the 30-day notification requirement for CWC Schedule 1 imports?

Within 30 days of each import consignment, the importer must notify the National Authority CWC (Cabinet Secretariat, Ministry of External Affairs, D&ISA), the Department of Chemicals and Petrochemicals, and DGFT, and submit a copy of the bill of entry to DGFT — this applies to all Schedule 1 chemicals under this CTI, not only Category 1B.

When does the Public Liability Insurance obligation arise for this HSN?

The obligation to take out a Public Liability Insurance policy under the PLI Act, 1991 arises when the imported hazardous substance exceeds the specified threshold quantities, per S.O. 227(E) dated 24-03-1992 issued by the Ministry of Environment and Forests.

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