Thailand’s Updates Hazardous Substances List: Changes Impact Global Chemical Industry

On 18 March 2025, Thailand’s Ministry of Industry has issued a major update to its List of Hazardous Substances (No. 8), which will come into effect the day after its publication in the Royal Gazette. This revision introduces significant changes to the classification and management of hazardous chemicals. These changes will affect manufacturers, importers, exporters, and stakeholders throughout the global chemical industry. The changes aim to enhance public safety, environmental protection, and regulatory compliance. 

Revocations: Key Substances Removed 

In the latest revision, two hazardous substances have been officially removed from the hazardous substances list. These substances were previously classified as hazardous but will no longer be subject to regulatory control. 

The first revocation involves plant extracts used for pest control, including substances such as neem, galangal, and citronella, which were previously listed under List 1.2 and controlled by the Department of Agriculture. The second revocation affects citronella oil, a substance previously listed under List 4.1 under the jurisdiction of the Food and Drug Administration (FDA). With these revocations, the Ministry of Industry has reclassified these substances, removing them from the list of regulated hazardous substances. 

Revised Control Measures for 17 Hazardous Substances 

In addition to the revocations, the announcement also includes extensive revisions to the control measures for 17 other hazardous substances. These revisions affect substances listed under the control of several government agencies. Notably, 10 substances under the Department of Industrial Works (List 5.1) have had their control measures updated, along with several substances under the Department of Agriculture (Lists 1.1 and 1.2) and the Food and Drug Administration (Lists 4.1 and 4.2). These changes reflect ongoing efforts to align Thailand’s regulatory framework with international safety standards and to address evolving concerns regarding chemical safety and environmental risks. 

New Hazardous Substances Added to the List 

Two new substances have been added to the hazardous substances list. Both pentachlorobenzene (CAS No. 608-93-5) and hexachlorobutadiene (CAS No. 87-68-3) are now classified under List 1.1 and are under the regulatory control of the Department of Agriculture. The inclusion of these substances signals Thailand's proactive approach to managing emerging chemical risks and ensuring that potentially harmful substances are adequately regulated. 

Implications for Global Chemical Industry Stakeholders 

The changes to Thailand’s hazardous substances list have important implications for the global chemical industry. Manufacturers, importers, exporters, and anyone involved in the trade or handling of hazardous chemicals must ensure compliance with the updated regulations. In particular, businesses dealing with substances that have been revoked or added to the list must take immediate action. For substances that have been added to the list, businesses will need to apply for permits and registrations within 30 days from the date of publication in the Royal Gazette. Companies managing previously listed chemicals should also ensure that they comply with the revised control measures.