Korean: 메칠클로로이소치아졸리논 · CAS 26172-55-4 · Functions: preservative
Restricted MFDS restricted ingredients
Conditions (official MFDS text, Korean):
* 배합한도 : ∙ 사용 후 씻어내는 제품에 0.0015%
(메칠클로로이소치아졸리논:메칠이소치아졸리논=(3:1)혼합물로서)
∙ 기타 제품에는 사용금지
Source: MFDS — cosmetic ingredient use restrictions · checked Oct 17, 2026
Approved preservative Annex V/39
Maximum: 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
Conditions: Product type: Rinse-off
Source: EU CosIng — Annex V · checked Oct 17, 2026
No specific rule on file. The FDA regulates few cosmetic ingredients by name; no rule does not mean approval.
How Methylchloroisothiazolinone is treated in 5 more markets, from the overseas cosmetic regulation database compiled by Korea's MFDS. Always confirm with the regulator of that country before selling there.
| Market | Status | Conditions |
|---|---|---|
| CN China | Restricted | MFDS summary (Korean): * 【화장품 중 최대사용농도】 배합한도 (일반) : 0.0015% * 기타 제한조건 및 요구사항 : 씻어내는제품에만 사용가능；메칠이소치아졸리논과 동시에 사용할 수 없음. |
| AS ASEAN (10 countries) | Restricted | MFDS summary (Korean): (9) Methylisothiazolinone is also regulated in entry 57. The two entries are mutually exclusive: the use of the mixture of Methylchloroisothiazolinone (and) Methylisothiazolinone is incompatible with the use of Methylisothiazolinone alone in the same product. * 단서조항(주석) : (9)... |
| CA Canada | Restricted | 【Restrictions】 Conditions of Use by product type : (a) Not permitted in leave-on products. (b) Rinse-off products Note: If MI is present in a formulation with Methylisothiazolinone / Methylchloroisothiazolinone (MI/MCI) in combination, the cumulative, total concentration of MI and MI/MCI may not exceed 0.0015%. 【Restrictions】 Maximum Concentration Permitted : b) 0.0015% |
| BR Brazil | Restricted | MFDS summary (Korean): * Restrictions 【Maximum concentration permitted at final product】 : 0.0015% (a mixture in proportions of 3: 1 5-Chloro-2-methyl- isothiazol-3 (2H) -one and 2- Methylisothiazol-3 (2H) -one) * 제한 【완제품에서 허용된 최대 농도】 : 0.0015% (5-클로로-2-메틸-이소치아졸-3(2H)-온과 2-메칠이소치아졸-3(2H)-온의 3:1 혼합물로서) |
| AR Argentina | Restricted | MFDS summary (Korean): * Restrictions 【Maximum concentration permitted at final product】 : 0.0015% (a mixture in proportions of 3: 1 5-Chloro-2-methyl- isothiazol-3 (2H) -one and 2- Methylisothiazol-3 (2H) -one) * 제한 【완제품에서 허용된 최대 농도】 : 0.0015% (5-클로로-2-메틸-이소치아졸-3(2H)-온과 2-메칠이소치아졸-3(2H)-온의 3:1 혼합물로서) |
Source: MFDS cosmetic ingredient use restrictions — overseas regulations · checked Oct 17, 2026
METHYLCHLOROISOTHIAZOLINONE 메칠클로로이소치아졸리논
Information only, not medical advice. Rules change — always check the linked official source. If you are pregnant, have a skin condition or allergies, ask a dermatologist or pharmacist.
In the EU's CosIng records it is listed as “Approved preservative” (EU CosIng — Annex V). The maximum allowed is 0.0015% (of a mixture in the ratio 3:1 of…. It is allowed for that use within the stated conditions.
In Korea's MFDS records it is listed as “Restricted” (MFDS — cosmetic ingredient use restrictions). A restricted ingredient is allowed within the stated conditions.
We found no specific rule for it in the FDA's records. That is not an approval or a safety statement.
The EU's CosIng inventory lists its functions as: preservative.
Korea's MFDS standard Korean name is 메칠클로로이소치아졸리논.
CAS 26172-55-4 (from official records).