Previous Update (October 24, 2025): Per Notifications S.O. 4862(E), 4863(E), and 4864(E), QCOs (2022) for the listed chemicals have been withdrawn.
- Acrylonitrile (IS 12540:1988)
- Maleic Anhydride, Technical (IS 5149:2020)
- Styrene (Vinyl Benzene) (IS 4105:2020)