Thailand Updates Hazardous Substances List

On 7 July 2025, Thailand's Ministry of Industry published the Notification on Hazardous Substances List (No. 8) B.E. 2568 (2025) in the Royal Gazette. The notification was signed on 5 June 2025 under Section 5 and Section 18 of the Hazardous Substances Act B.E. 2535 (1992), with the approval of the Hazardous Substances Committee. The new list entered into force on 8 July 2025.

Clause 1 – Revocations

The following items in the Hazardous Substances List B.E. 2556 (2013) (dated 28 August 2013) are revoked:

Department of Agriculture (List 1.2)

• Sequence No. 5: Plant extracts used for preventing/eliminating agricultural pests (e.g., neem, galangal, lemongrass).

Food and Drug Administration (List 5.1)

• Sequence No. 13: Citronella oil.

Clause 2 – Revisions

The following entries in the 2013 list are revoked and replaced by updated definitions or specifications.

Department of Agriculture

List 1.1

• Sequence No. 155: Dicofol

List 1.2

• Sequence No. 5 – Active ingredients/microorganisms/products for regulating plant growth (stimulating, inhibiting, or retarding), including flowering, fruiting, color change, rooting, etc.
• Sequence No. 10 – Active ingredients/microorganisms/products for preventing, eliminating, destroying, or controlling insects or animals that are plant pests.
• Sequence No. 11 – Active ingredients/microorganisms/products for preventing, eliminating, destroying, or controlling plant diseases.
• SequenceNo. 12 – Active ingredients/microorganisms/products for preventing, eliminating, destroying, or controlling weeds or undesirable plants.

Food and Drug Administration

List 5.1

• Sequence No. 223: Hydrogen peroxide (CAS 7722-84-1)

List 5.2

• Sequence No. 22: Chlorine and chlorine-releasing substances.

Department of Industrial Works

List 5.1

• Gold (I) cyanide
• Gold sodium cyanide
• Gold potassium cyanide
• Copper (I) cyanide
• Copper (II) cyanide
• Cadmium cyanide
• Zinc cyanide
• Sodium cyanide (except parts under FDA responsibility)
• Potassium cyanide (except parts under FDA responsibility)
• Propionitrile (ethyl cyanide)

Clause 3 – Additions

The following substances are added to List 1.1 (Department of Agriculture):

• Sequence No. 253: Pentachlorobenzene
• Sequence No. 255: Hexachlorobutadiene

Clause 4 – Transitional Provisions

• Type 3 hazardous substances – Operators in business before the effective date must apply for permission within 30 days. If registration is required, it must be submitted within the same period.
• Type 4 hazardous substances – Operators in business before the effective date must comply with competent official orders within 180 days.

Clause 5 – Effective Date

Effective 8 July 2025, the day after publication in the Government Gazette.

List 1.1 Controlled Substances – Department of Agriculture

List 1.2 Controlled Substances – Department of Agriculture

List 5 Controlled Substances – Food and Drug Administration

List 5.1 Controlled Substances – Department of Industrial Works (Type 3)