Diaminostilbene 2,2-disulphonic acid (Dasda)
Diaminostilbene 2,2-disulphonic acid, amine-function compound
HSN 2921 59 40 (Diaminostilbene 2,2-disulphonic acid, DASDA) is subject to registration and import permit requirements from the Central Insecticides Board and Registration Committee (CIB&RC) under the Insecticides Act, 1968, where the substance figures in the Schedule to that Act, with import restricted to specified ports under Rule 45 of the Insecticides Rules, 1971. Narcotic Drugs and Psychotropic Substances (NDPS) import certificate conditions under Chapter VII-A of the NDPS Rules, 1985, Chemical Weapons Convention controls under the ITC (HS) policy, and mandatory Chapter 29 qualifiers under CBIC Circular 23/2023-Cus apply as additional clearance requirements.
- Registration and import permit from CIB&RC
- Import certificate from NDPS
- Chapter 29 qualifiers from CBIC
Procedural directions for customs clearance are issued by: Directorate General of Foreign Trade, Central Board of Indirect Taxes and Customs.
- 1Where the substance 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 filing the bill of entry. Route the consignment only through the specified ports notified under Rule 45 of the Insecticides Rules, 1971.Insecticides Act, 1968 · Rule 45 of the Insecticides Rules, 1971 · ITC (HS) policy condition, Chapter 29
- 2If the substance also falls under NDPS controls, obtain an import certificate under Rule 53 of the NDPS Rules, 1985 for medical or scientific purposes as per Chapter VII-A of those Rules. Imports outside this category are governed by Appendix I to the ITC (HS) Schedule per ITC (HS) policy condition 2 to Chapter 29.Rule 53 of the NDPS Rules, 1985 · ITC (HS) policy condition 2 to Chapter 29
- 3File mandatory additional qualifiers in the import declaration for Chapter 29 commodities as stipulated in Para 4.1 and 4.2 of CBIC Circular 23/2023-Cus dated 30-09-2023, effective 15 October 2023. Where import of specified hazardous substances exceeds specified quantities, obtain 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
The most common error on this tariff line is treating DASDA as a straightforward organic chemical and overlooking the conditional multi-regime overlay: CIB&RC registration applies only if the substance appears in the Schedule to the Insecticides Act, 1968, but the CBIC Chapter 29 qualifier obligation under Circular 23/2023-Cus applies unconditionally to all declarations under this CTI. Importers who clear the CIB&RC and NDPS tracks but omit the mandatory additional qualifiers face bill-of-entry rejection and detention at the port of import.