Trimellitic anhydride

Trimellitic anhydride, aromatic polycarboxylic acid anhydride

CIB&RC CLEARANCE · NDPS CLEARANCE

HSN 2917 39 50 (Trimellitic anhydride) is subject to Central Insecticides Board and Registration Committee (CIB&RC) registration and import permit under the Insecticides Act, 1968, where the substance figures in the Schedule to that Act. Narcotic Drugs and Psychotropic Substances (NDPS) import-certificate conditions under Chapter VII-A of the NDPS Rules, 1985, and Directorate General of Foreign Trade (DGFT) ITC (HS) policy condition 2 of Chapter 29 apply as concurrent overlays, alongside mandatory Chapter 29 qualifier declarations under CBIC Circular 23/2023-Cus.

What this is

HSN code

2917 39 50

Chapter

29 · Organic chemicals

Primary regulator

CIB&RC · Insecticides Act, 1968 and Insecticides Rules, 1971

Customs documentation

Registration certificate from CIB&RC
Import permit from CIB&RC
Chapter 29 qualifiers from CBIC

Applicable Partner Government Agencies

CIB&RCCIB&RC·Central Insecticides Board and Registration Committee

NDPSNDPS·Narcotics Control Bureau

Procedural directions for customs clearance are issued by: Directorate General of Foreign Trade, Central Board of Indirect Taxes and Customs.

Compliance steps

1
Where trimellitic anhydride figures in the Schedule to the Insecticides Act, 1968, obtain registration and an import permit from the Secretariat of the Central Insecticides Board and Registration Committee before shipment. Import is restricted to ports specified under Rule 45 of the Insecticides Rules, 1971; shipment to any unspecified port renders the consignment liable to seizure.
Insecticides Act, 1968 · Rule 45 of the Insecticides Rules, 1971
2
If the substance also qualifies as an NDPS-scheduled item, obtain an import certificate under Rule 53 of the NDPS Rules, 1985 for medical and scientific-purpose imports. Imports outside that category are governed by Appendix-I to the ITC (HS) Schedule under ITC (HS) policy condition 2 of Chapter 29.
Chapter VII-A of the NDPS Rules, 1985 · Rule 53 of the NDPS Rules, 1985 · ITC (HS) policy condition 2, Chapter 29
3
File the bill of entry with the mandatory additional qualifiers for Chapter 29 commodities as stipulated in paragraphs 4.1 and 4.2 of CBIC Circular 23/2023-Cus, with effect from 15 October 2023. Additionally, where import of the specified hazardous substance exceeds prescribed quantities, the owner must take out an insurance policy under the Public Liability Insurance 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

A word of counsel

The most common error on this tariff line is treating CIB&RC registration as the only clearance hurdle and filing the bill of entry at an unrestricted port. Rule 45 of the Insecticides Rules, 1971 confines import to specified locations, and arrival at a non-notified port triggers detention and potential confiscation regardless of whether the registration and permit documents are current. The Chapter 29 mandatory qualifiers under CBIC Circular 23/2023-Cus are a separate customs-declaration obligation that must be satisfied at the bill-of-entry stage even where PGA clearances are complete.

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Frequently asked

Does HSN 2917 39 50 require BIS certification?

No, trimellitic anhydride is not within the BIS Quality Control Order regime. Import is governed by Central Insecticides Board and Registration Committee registration and permit under the Insecticides Act, 1968, with NDPS Rules overlay and DGFT ITC (HS) policy condition 2 of Chapter 29 where applicable.

Which ports are notified for import of insecticide-scheduled substances under Rule 45 of the Insecticides Rules, 1971?

The permitted import locations are restricted under Rule 45 of the Insecticides Rules, 1971; the current list must be confirmed with the CIB&RC Secretariat before booking the consignment, as arrival at an unnotified port exposes the goods to seizure.

When does the Public Liability Insurance requirement apply to this import?

The owner must obtain an insurance policy under the Public Liability Insurance Act, 1991 when the imported quantity of the specified hazardous substance exceeds the prescribed threshold quantities, as detailed in 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: CIB&RC / NDPS / DGFT / CBIC / Indian Customs CUSDATA.