Educational Information Only
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HSA Section 4 — Definition of hazardous substance
Hazardous Substances Act (พระราชบัญญัติวัตถุอันตราย) — Section 4.
Plain-English Summary
Defines a hazardous substance (วัตถุอันตราย) by listing ten categories: explosives; flammables; oxidising substances and peroxides; toxic substances; disease-causing substances; radioactive substances; substances that cause genetic change; corrosives; irritants; and any other substance, chemical or otherwise, that may harm persons, animals, plants, property or the environment. The same section defines the regulated acts (produce, import, export, transit, re-import, re-export, sell, possess), as well as label, container, advertisement and initial damages; several of these definitions were added or amended by the 2019 (No. 4) amendment.
Official Text
Official Thai text at the Royal Gazette / Office of the Council of State. Translation summary only.
Consult official sourceParent Statute
Hazardous Substances Act
พระราชบัญญัติวัตถุอันตราย · B.E. 2535 (1992)
The Hazardous Substances Act B.E. 2535 (1992) regulates hazardous substances (explosives, flammables, toxic, radioactive, corrosive and other harmful substances) from production, import, export, transit and possession through sale, transport, storage and disposal, the last of these controlled by ministerial notifications. A Hazardous Substances Committee chaired by the Minister of Industry advises, and the responsible agency for each substance is designated by Gazette notification under Section 18 paragraph 2 and Section 19, so several agencies may administer different substances. Substances fall into four types: Type 1 must follow prescribed rules, Type 2 requires prior notification, Type 3 requires a licence, and Type 4 is prohibited except for written-permission use as a laboratory reference standard (Section 43) or a ministerial exemption (Section 44). The Act also covers registration, advertising, official inspection and seizure powers, civil liability for damage, and criminal penalties.
The summary above is a plain-English educational paraphrase of Section 4 of the Hazardous Substances Act. It is not an authoritative translation. For the binding Thai text, consult the Royal Gazette or the Office of the Council of State. Educational use only — not a substitute for advice from a Thai-qualified lawyer.
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