METHYLCHLOROISOTHIAZOLINONE
METHYLCHLOROISOTHIAZOLINONE is a cosmetic ingredient classified as Preservative. Also known as CAS 26172-55-4. It is regulated in 20 markets including UAE, Australia, Bahrain.
Also Known As
- CAS Number
- 26172-55-4, 2682-20-4, 55965-84-9
Market Overview — 29 Markets
Detailed Regulations
Europe3 regulations
- Chemical name
- Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one with magnesium chloride and magnesium nitrate
- CAS
- 26172-55-4, 2682-20-4, 55965-84-9
- Max concentration
- 0.0015% (of a mixture in the ratio 3:1 of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one
- Product type
- Rinse-off
Source: EC 1223/2009 Annex V
- Chemical name
- Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-methylisothiazol-3(2H)-one
- CAS
- 26172-55-4, 2682-20-4, 55965-84-9
- Max concentration
- 0,0015 % (of a mixture in the ratio 3:1 of 5-chloro-2-methylisothiazol 3(2H)-one and 2-methylisothiazol-3 (2H)-one)
- Product type
- Rinse-off products
- Conditions of use
- Max: 0,0015 % (of a mixture in the ratio 3:1 of 5-chloro-2-methylisothiazol 3(2H)-one and 2-methylisothiazol-3 (2H)-one)
Source: UK retained EC 1223/2009 Annex V
- Chemical name
- 2-Methyl-2H-isothiazol-3-one
- CAS
- 2682-20-4
- Max concentration
- 0,0015 %
- Product type
- Rinse-off products
- Conditions of use
- Max: 0,0015 %
Source: UK retained EC 1223/2009 Annex V
Americas2 regulations
- Chemical name
- Methylisothiazolinone / Methylchloroisothiazolinone, in combination
- CAS
- 26172-55-4
- Max concentration
- b) 0.0015%
- Conditions of use
- a) Not permitted in leave-on products. b) Rinse-off products Note: MCI is only permitted when present in combination with MI. If MI/MCI is present in a formulation with MI alone, the cumulative, total concentration of MI/MCI and MI may not exceed 0.0015%.
Source: Health Canada Cosmetic Ingredient Hotlist
- Chemical name
- Mistura de 5-cloro-2-metil-4-is otiazolina-3-ona e 2-metil-4-isotiazo lina-3-ona com cloreto de magnésio e nitrato de magnésio (3:1)
- CAS
- 26172-55-4
- Max concentration
- 0,0015% (de uma mistura em proporções 3:1 de 5-Chloro-2-methyl- isothiazol-3(2H)-on e e 2- Methylisothiazol-3 (2H)-one) em produtos que se enxáguem.
- Conditions of use
- Limitations: -Proibido em produtos que não se enxáguem (incluindo os lenços umedecidos ). -A utilização da mistura de methylchlor oisothiazoli none e methylisothi azolinone é incompatíve l com a utilização de methylisothi azolinone sozinha em um mesmo produto.
Source: ANVISA RDC 528
East Asia & Oceania4 regulations
- Chemical name
- Methylchloroisothiazolinone
- Conditions of use
- * 배합한도 : ∙ 사용 후 씻어내는 제품에 0.0015% (메칠클로로이소치아졸리논:메칠이소치아졸리논=(3:1)혼합물로서) ∙ 기타 제품에는 사용금지
Source: MFDS Korea Cosmetics Regulation
- Chemical name
- Methylchloro isothiazolinone and methyl isothiazolinone solution
- Max concentration
- 0.10%
- Product type
- Rinse-off (cosmetics washed away after use)
- Conditions of use
- Aqueous solution containing 1.0-1.3% 5-chloro-2-methyl-4-isothiazolin-3-one and 0.30-0.42% 2-methyl-4-isothiazolin-3-one
Source: MHLW Standards for Cosmetics (Notification No.331 of 2000)
- Chemical name
- Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one with magnesium chloride and magnesium nitrate
- CAS
- 55965-84-9, 26172-55-4, 2682-20-4
- Max concentration
- 0.0015 %
- Product type
- R i nse off products
- Conditions of use
- Mixture in the ratio 3:1 of 5-Chloro-2-methyl-isothia zol-3(2H)-one and 2- Methylisothiazol-3(2H)-one
Source: TFDA Cosmetics Regulations
- Chemical name
- METHYLCHLOROISOTHIAZOLINONE except
- Conditions of use
- (a) in rinse-off cosmetic preparations or therapeutic goods intended for topical rinse-off application containing 0.0015% or less of methylchloroisothiazolinone and methylisothiazolinone in total; or (b) in other preparations that are not intended for direct application to the skin containing 0.1% or less of methylchloroisothiazolinone and methylisothiazolinone in total.
Source: TGA SUSMP F2026L00060
ASEAN6 regulations
- Chemical name
- Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)- one and 2-Methylisothiazol-3(2H)-one (INCI) / Methylchloroisothiazolinone (and) Methylisothiazolinone (9), 2682-20-4, 55965-84-9
- CAS
- 26172-55-4
- Max concentration
- 0,0015 %(of a mixture in the ratio 3:1 of 5-chloro- 2- methylisothiazol 3(2H)-one and 2-methylisothiazol-3 (2H)-one)
- Conditions of use
- Rinse-off products
Source: ASEAN Cosmetic Directive (HSA Dec 2025)
- Chemical name
- Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)- one and 2-Methylisothiazol-3(2H)-one (INCI) / Methylchloroisothiazolinone (and) Methylisothiazolinone (9), 2682-20-4, 55965-84-9
- CAS
- 26172-55-4
- Max concentration
- 0,0015 %(of a mixture in the ratio 3:1 of 5-chloro- 2- methylisothiazol 3(2H)-one and 2-methylisothiazol-3 (2H)-one)
- Conditions of use
- Rinse-off products
Source: ASEAN Cosmetic Directive (HSA Dec 2025)
- Chemical name
- Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)- one and 2-Methylisothiazol-3(2H)-one (INCI) / Methylchloroisothiazolinone (and) Methylisothiazolinone (9), 2682-20-4, 55965-84-9
- CAS
- 26172-55-4
- Max concentration
- 0,0015 %(of a mixture in the ratio 3:1 of 5-chloro- 2- methylisothiazol 3(2H)-one and 2-methylisothiazol-3 (2H)-one)
- Conditions of use
- Rinse-off products
Source: ASEAN Cosmetic Directive (HSA Dec 2025)
- Chemical name
- Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)- one and 2-Methylisothiazol-3(2H)-one (INCI) / Methylchloroisothiazolinone (and) Methylisothiazolinone (9), 2682-20-4, 55965-84-9
- CAS
- 26172-55-4
- Max concentration
- 0,0015 %(of a mixture in the ratio 3:1 of 5-chloro- 2- methylisothiazol 3(2H)-one and 2-methylisothiazol-3 (2H)-one)
- Conditions of use
- Rinse-off products
Source: ASEAN Cosmetic Directive (HSA Dec 2025)
- Chemical name
- Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)- one and 2-Methylisothiazol-3(2H)-one (INCI) / Methylchloroisothiazolinone (and) Methylisothiazolinone (9), 2682-20-4, 55965-84-9
- CAS
- 26172-55-4
- Max concentration
- 0,0015 %(of a mixture in the ratio 3:1 of 5-chloro- 2- methylisothiazol 3(2H)-one and 2-methylisothiazol-3 (2H)-one)
- Conditions of use
- Rinse-off products
Source: ASEAN Cosmetic Directive (HSA Dec 2025)
- Chemical name
- Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)- one and 2-Methylisothiazol-3(2H)-one (INCI) / Methylchloroisothiazolinone (and) Methylisothiazolinone (9), 2682-20-4, 55965-84-9
- CAS
- 26172-55-4
- Max concentration
- 0,0015 %(of a mixture in the ratio 3:1 of 5-chloro- 2- methylisothiazol 3(2H)-one and 2-methylisothiazol-3 (2H)-one)
- Conditions of use
- Rinse-off products
Source: ASEAN Cosmetic Directive (HSA Dec 2025)
GCC6 regulations
- Chemical name
- Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one with magnesium chloride and magnesium nitrate
- CAS
- 26172-55-4, 2682-20-4, 55965-84-9
- Max concentration
- 0.0015% (of a mixture in the ratio 3:1 of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one
- Product type
- Rinse-off
Source: GSO 1943:2024 (based on EU 1223/2009 V)
- Chemical name
- Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one with magnesium chloride and magnesium nitrate
- CAS
- 26172-55-4, 2682-20-4, 55965-84-9
- Max concentration
- 0.0015% (of a mixture in the ratio 3:1 of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one
- Product type
- Rinse-off
Source: GSO 1943:2024 (based on EU 1223/2009 V)
- Chemical name
- Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one with magnesium chloride and magnesium nitrate
- CAS
- 26172-55-4, 2682-20-4, 55965-84-9
- Max concentration
- 0.0015% (of a mixture in the ratio 3:1 of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one
- Product type
- Rinse-off
Source: GSO 1943:2024 (based on EU 1223/2009 V)
- Chemical name
- Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one with magnesium chloride and magnesium nitrate
- CAS
- 26172-55-4, 2682-20-4, 55965-84-9
- Max concentration
- 0.0015% (of a mixture in the ratio 3:1 of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one
- Product type
- Rinse-off
Source: GSO 1943:2024 (based on EU 1223/2009 V)
- Chemical name
- Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one with magnesium chloride and magnesium nitrate
- CAS
- 26172-55-4, 2682-20-4, 55965-84-9
- Max concentration
- 0.0015% (of a mixture in the ratio 3:1 of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one
- Product type
- Rinse-off
Source: GSO 1943:2024 (based on EU 1223/2009 V)
- Chemical name
- Mixture of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one with magnesium chloride and magnesium nitrate
- CAS
- 26172-55-4, 2682-20-4, 55965-84-9
- Max concentration
- 0.0015% (of a mixture in the ratio 3:1 of 5-Chloro-2-methyl-isothiazol-3(2H)-one and 2-Methylisothiazol-3(2H)-one
- Product type
- Rinse-off
Source: GSO 1943:2024 (based on EU 1223/2009 V)
EAEUNo restrictions
No specific restrictions for METHYLCHLOROISOTHIAZOLINONE in Russia, Belarus, Kazakhstan, Armenia, Kyrgyzstan.
Frequently Asked Questions
Is METHYLCHLOROISOTHIAZOLINONE banned in any country?
METHYLCHLOROISOTHIAZOLINONE is not banned in any of the 26 markets tracked by Formpli. However, it may be subject to restrictions or conditions of use in some markets.
What are the restrictions on METHYLCHLOROISOTHIAZOLINONE in cosmetics?
METHYLCHLOROISOTHIAZOLINONE is restricted or has conditions of use in UAE, Australia, Bahrain, Brazil, Canada, European Union, Indonesia, Japan, South Korea, Kuwait, Malaysia, Oman, Philippines, Qatar, Saudi Arabia, Singapore, Thailand, Taiwan, United Kingdom, Vietnam. Restrictions may include maximum concentration limits, product type limitations, or mandatory labeling requirements. See the detailed regulations above for specifics.
Can I use METHYLCHLOROISOTHIAZOLINONE in cosmetics?
METHYLCHLOROISOTHIAZOLINONE is regulated in 20 markets. It has restrictions in UAE, Australia, Bahrain, Brazil, Canada, European Union, Indonesia, Japan, South Korea, Kuwait, Malaysia, Oman, Philippines, Qatar, Saudi Arabia, Singapore, Thailand, Taiwan, United Kingdom, Vietnam. Use Formpli's free screening tool to check your full ingredient list against all 26 markets at once.
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Check Ingredients FreeThis information is for reference only and does not constitute legal or regulatory advice. Regulations change — always verify with official sources and consult a regulatory specialist before exporting cosmetic products. Data sourced from EU COSING, US FDA, Health Canada, MHLW Japan, MFDS Korea, ASEAN ACD, GCC SFDA, TGA Australia, ANVISA Brazil, EAEU TR CU, and Taiwan TFDA.