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Updates: On May 14, 2025, DCPC released a notification on the Gazette of India to delay the implementation date of QCOs for H Acid and Vinyl Sulphone from May 13, 2025 to August 13, 2025. For K-Acid, the implementation date is extended for another year from May 13, 2025 to May 13, 2026.
On November 14, 2024, India's Department of Chemicals & Petrochemicals (DCPC) released a notification for Quality Control Orders (QCOs) for H Acid, K Acid and Vinyl Sulphone. These 3 chemicals are now added to ISI (Scheme-I) of BIS mandatory list.
The notified substances as well as corresponding Indian Standards are listed below:
| S.No. | Chemical Name | Indian Standard | HS Code | Other Name |
| 1. | H Acid | IS 8637:2020 H Acid - Specification | 29222160 | 1-amino-8-naphthol-3,6-disulfonic acid |
| 2. | K Acid | IS 11557:1986 2- Naphthylamine - 3 : 6 : 8 - Trisulphonic Acid, Technical Ma | 29214590 | 2-Naphthylamine-3 : 6 : 8-trisulfonic acid |
| 3. | Vinyl Sulphone | IS 18340:2023 Vinyl Sulphone-Specification | 29041090 | / |
The 3 QCOs shall come into force on May 13, 2025.
The QCO does not apply to chemicals for export only (click here to see more about exemption). The locally manufactured or imported product shall conform to the corresponding Indian Standard and shall bear the Standard Mark under license from the Bureau of Indian Standards (BIS) as per Scheme-I of Schedule-II of the Bureau of Indian Standards (Conformity Assessment) Regulations, 2018 (check our page on Chempedia on BIS Certification in India to learn more).
Here are the QCOs for H Acid, K Acid and Vinyl Sulphone.
