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Thailand Expands the List of Prohibited Ingredients in Cosmetics

Thailand has newly added 56 prohibited cosmetic ingredients, including octamethylcyclotetrasiloxane (D4), sodium perborate, diisohexyl phthalate (DIHxP), and Tetrafluoroethylene.

On January 31, 2025, Thailand published a notification in the Royal Government Gazette announcing the addition of 56 new substances (entries 1613–1668) to its List of Prohibited Ingredients in Cosmetics. These changes, which came into effect on February 1, 2025, align Thailand’s cosmetic regulations with the latest updates to the ASEAN Cosmetics Directive (ACD) adopted during the previous ASEAN Cosmetic Committee Meetings.

To ensure a smooth transition, a 180-day grace period has been granted to cosmetic businesses that have already manufactured, imported, or sold products containing the newly prohibited ingredients before the effective date of the announcement.

Below are the details of the 56 prohibited ingredients:

Ref No.

Newly Included Prohibited Ingredients

CAS No.

1613

Octamethylcyclotetrasiloxane; D4

556-67-2

1614

Sodium perborate [1];

Sodium peroxometaborate; sodium peroxoborate [2]

15120-21-5 [1]

7632-04-4 [2]

10332-33-9 [2]

1615

Perboric acid (H3BO2(O2)), monosodium salt trihydrate [1];

Perboric acid, sodium salt, tetrahydrate [2];

Perboric acid (HBO(O2)), sodium salt, tetrahydrate sodium peroxoborate hexahydrate [3]

13517-20-9 [1]

37244-98-7 [2]

10486-00-7 [3]

1616

Perboric acid, sodium salt [1];

Perboric acid, sodium salt, monohydrate [2];

Perboric acid (HBO(O2)), sodium salt, monohydrate [3]

11138-47-9 [1]

12040-72-1 [2]

10332-33-9 [3]

1617

Nickel diformate [1];

Formic acid, nickel salt [2];

Formic acid, copper nickel salt [3]

3349-06-2 [1]

15843-02-4 [2]

68134-59-8 [3]

1618

Nickel barium titanium primrose priderite; C.I. Pigment Yellow 157; C.I. 77900

68610-24-2

1619

Nickel dichlorate [1];

Nickel dibromate [2];

Ethyl hydrogen sulfate, nickel(II) salt [3]

67952-43-6 [1]

14550-87-9 [2]

71720-48-4 [3]

1620

Trisodium nitrilotriacetate

5064-31-3

1621

Cyclohexylamine

108-91-8

1622

Cobalt

7440-48-4

1623

Metaldehyde (ISO); 2,4,6,8-tetramethyl- 1,3,5,7- tetraoxacyclooctane

108-62-3

1624

Methylmercuric chloride

115-09-3

1625

Benzo[rst]pentaphene

189-55-9

1626

Dibenzo[b,def]chrysene; dibenzo[a,h]pyrene

189-64-0

1627

Ethanol, 2,2'-iminobis-, N- (C13-15-branched and linear alkyl) derivs.

97925-95-6

1628

Cyflumetofen (ISO); 2-methoxyethyl (RS)-2- (4-tert-butylphenyl)-2-cyano-3-oxo-3-(α,α,α-trifluoro- otolyl)propionate

400882-07-7

1629

Diisohexyl phthalate

71850-09-4

1630

halosulfuron-methyl (ISO); methyl 3-chloro-5-{[(4,6- dimethoxypyrimidin-2-yl) carbamoyl] sulfamoyl}-1- methyl1H-pyrazole-4- carboxylate

100784-20-1

1631

2-methylimidazole

693-98-1

1632

Metaflumizone (ISO); (EZ)-2'-[2-(4-cyanophenyl)-1-(α,α,α - trifluoro-m- tolyl)ethylidene]-[4-(trifluoromethoxy)phenyl] carbanilohydrazide [E-isomer ≥ 90 %, Z-isomer ≤ 10 % relative content]; [1]

(E)-2'-[2-(4-cyanophenyl)- 1-(α,α,α - trifluoro-m-tolyl) ethylidene]-[4-(trifluoromethoxy)phenyl] carbanilohydrazide [2]

139968-49-3 [1]

852403-68-0 [2]

1633

Dibutylbis(pentane-2,4- dionato-O,O’)tin

22673-19-4

1634

Silicon carbide fibres (with diameter < 3 µm, length > 5 µm and aspect ratio ≥ 3:1)

409-21-2;

308076-74-6

1635

Tris(2-methoxyethoxy) vinylsilane; 6-(2-methoxyethoxy)- 6- vinyl-2,5,7,10-tetraoxa-6-silaundecane

1067-53-4

1636

Dioctyltin dilaurate; [1]

Stannane, dioctyl-, bis (coco acyloxy) derivs. [2]

3648-18-8 [1]

91648-39-4 [2]

1637

Dibenzo[def,p]chrysene; dibenzo[a,l]pyrene

191-30-0

1638

Ipconazole (ISO); (1RS,2SR,5RS;1RS,2SR,5SR)-2-(4- chlorobenzyl)-5-isopropyl-1- (1H-1,2,4-triazol-1-ylmethyl) cyclopentanol

125225-28-7/

115850-69-6/

115937-89-8

1639

Bis(2-(2-methoxyethoxy)ethyl)ether; tetraglyme

143-24-8

1640

Paclobutrazol (ISO); (2RS,3RS)-1-(4-chlorophenyl)-4,4-dimethyl- 2-(1H-1,2,4-triazol-1- yl)pentan-3-ol

76738-62-0

1641

2,2-bis(bromomethyl) propane-1,3-diol

3296-90-0

1642

2-(4-tert-butylbenzyl) propionaldehyde

80-54-6

1643

Diisooctyl phthalate

27554-26-3

1644

2-methoxyethyl acrylate

3121-61-7

1645

Flurochloridone (ISO); 3-chloro-4-(chloromethyl)-1-[3- (trifluoromethyl)phenyl]pyrrolidin-2-one

61213-25-0

1646

3-(difluoromethyl)-1- methyl-N-(3',4',5'-trifluorobiphenyl-2-yl) pyrazole-4-carboxamide; fluxapyroxad

907204-31-3

1647

N-(hydroxymethyl)acrylamide; methylolacrylamide; [NMA]

924-42-5

1648

5-fluoro-1,3-dimethyl-N-[2-(4- methylpentan-2-yl) phenyl]-1H-pyrazole- 4-carboxamide; 2'- [(RS)-1,3-dimethylbutyl]-5-fluoro-1,3-dimethylpyrazole-4-carboxanilide; penflufen

494793-67-8

1649

Iprovalicarb (ISO); isopropyl [(2S)-3- methyl-1-{[1-(4- methylphenyl)ethyl] amino}-1-oxobutan-2- yl]carbamate

140923-17-7

1650

Dichlorodioctylstannane

3542-36-7

1651

Mesotrione (ISO); 2-[4-(methylsulfonyl)- 2-nitrobenzoyl]-1,3- cyclohexanedione

104206-82-8

1652

Hymexazol (ISO); 3-hydroxy-5-methylisoxazole

10004-44-1

1653

Imiprothrin (ISO); reaction mass of: [2,4- dioxo-(2-propyn-1-yl) imidazolidin-3-yl] methyl(1R)-cis-chrysanthemate; [2,4-dioxo-(2-propyn-1-yl) imidazolidin-3-yl] methyl(1R)-trans-chrysanthemate

72963-72-5

1654

Bis(α,α-dimethylbenzyl) peroxide

80-43-3

1655

6,6'-di-tert-butyl-2,2'-methylenedi-p-cresol; [DBMC]

119-47-1

1656

Tetrafluoroethylene

116-14-3

1657

(5-chloro-2-methoxy-4-methyl-3-pyridyl)(4,5,6-trimethoxy-otolyl)methanone; pyriofenone

688046-61-9

1658

(RS)-1-{1-ethyl-4-[4-mesyl-3-(2-methoxyethoxy)- otoluoyl]pyrazol-5-yloxy}ethyl methyl carbonate; tolpyralate

1101132-67-5

1659

Azamethiphos (ISO); S-[(6-chloro-2-oxooxazolo[4,5- b]pyridin3(2H)-yl)methyl] O,O-dimethyl thiophosphate

35575-96-3

1660

3-methylpyrazole

1453-58-3

1661

N-methoxy-N-[1-methyl-2-(2,4,6-trichlorophenyl)-ethyl]-3- (difluoromethyl)-1-methylpyrazole-4-carboxamide; pydiflumetofen

1228284-64-7

1662

N-{2-[[1,1'-bi(cyclopropyl)]-2-yl]phenyl}-3-(difluoromethyl)-1- methyl-1H-pyrazole-4-carboxamide; sedaxane

874967-67-6

1663

4-methylpentan-2-one; isobutyl methyl ketone (MIBK)

108-10-1

1664

Dimethomorph (ISO); (E,Z)-4-(3-(4-chlorophenyl)-3-(3,4- dimethoxyphenyl)acryloyl)morpholine

110488-70-5

1665

Imazamox (ISO); (RS)-2-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)-5-methoxymethylnicotinic acid

114311-32-9

1666

Thiamethoxam (ISO); 3-(2-chloro-thiazol-5-ylmethyl)-5- methyl[1,3,5]oxadiazinan-4-ylidene-N-nitroamine

153719-23-4

1667

Triticonazole (ISO); (RS)-(E)-5-(4-chlorobenzylidene)-2,2-dimethyl-1-(1H-1,2,4-triazol-1-methyl)cyclopentanol

138182-18-0

1668

Desmedipham (ISO); ethyl 3- phenylcarbamoyloxyphenylcarbamate

13684-56-5

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