Educational Information Only
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HSA Section 18 — Four types of hazardous substance
Hazardous Substances Act (พระราชบัญญัติวัตถุอันตราย) — Section 18.
Plain-English Summary
Divides hazardous substances into four types according to the control needed. Type 1: production, import, export or possession must follow the prescribed criteria and methods. Type 2: the same acts require prior notification to the competent official, as well as compliance with the prescribed criteria and methods. Type 3: the same acts require a licence. Type 4: production, import, export, transit and possession are prohibited. Under paragraph 2 the Minister of Industry, on the committee's opinion, names or describes the substances, assigns their type, fixes when the notification takes effect and designates the responsible agency by Government Gazette notification; the agency for a given substance therefore comes from that notification, not from Section 18 itself.
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 18 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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