Reference source : Department of Industrial Works
Bangkok, May 2025. Thailand’s Department of Industrial Works (DIW) has opened a public consultation on the principles of a draft Ministry of Industry notification to amend the Hazardous Substance List under DIW oversight. The draft is framed as a compliance and governance update to better align Thailand’s domestic controls with the Chemical Weapons Convention (CWC), following OPCW-recognized additions to Schedule 1 and Thailand’s national coordination process for CWC implementation.
Schedule-chemical consolidation into a dedicated category. The draft would reorganize how CWC-controlled chemicals are presented in Thailand’s DIW lists, addressing the current dispersion of CWC chemicals across multiple sub-lists and improving clarity for both enforcement and compliance. Removal of legacy entries from List 5.1. The proposal would delete 43 entries of CWC-related chemicals currently appearing under List 5.1 of the Ministry of Industry’s Hazardous Substance List, as part of a restructuring approach rather than a deregulation of those substances. Renaming and strengthening of List 5.5 as the CWC control list. The draft would revise the title of List 5.5 to explicitly designate it as the list for CWC-controlled substances, creating a single focal point for regulated schedule chemicals under DIW responsibility. Expansion to 1,378 controlled entries under List 5.5. The amended List 5.5 would contain 1,378 entries, built from (i) the 43 items moved from List 5.1 and (ii) a broader consolidation of schedule-chemical references aligned to OPCW documentation and identifiers used for schedule controls.
Addition of four newly recognized Schedule 1 controls (CWC “13–16”). The draft reflects OPCW-recognized additions to Schedule 1, including three groups and one specific substance, to be controlled as Type 4 hazardous substances under DIW responsibility. The consultation paper describes these as:
DIW’s notice sets a consultation window running 15 May to 15 June 2025, with feedback collected through Thailand’s central legal consultation platform and DIW’s official communication channels. The notice is signed by the Director-General of DIW and positions the consultation as part of improving regulatory effectiveness and supporting treaty implementation.
If adopted, the amendment would not simply add new names, but materially change how CWC controls are organized and referenced in Thailand’s hazardous substance lists. Importers, exporters, manufacturers, in-possession operators, and transit actors handling DIW-regulated hazardous substances should expect clearer classification logic around schedule chemicals, stronger list-based screening expectations, and greater consistency between domestic controls and OPCW schedule references, including CAS-based identification for grouped substances.
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