Korean: 디메칠옥사졸리딘 · CAS 51200-87-4 · Functions: preservative
Restricted MFDS restricted ingredients
Conditions (official MFDS text, Korean):
* 배합한도 : 0.05%
(다만, 제품의 pH는 6을 넘어야 함)
Source: MFDS — cosmetic ingredient use restrictions · checked Oct 16, 2026
Approved preservative Annex V/45
Maximum: 0.1%
Conditions: pH > 6
Source: EU CosIng — Annex V · checked Oct 16, 2026
Banned in some U.S. states WA-TFCA
Conditions: Washington: Toxic-Free Cosmetics Act (Substitute House Bill 1047, Chapter 455, Laws of 2023) and Cosmetic Products Restrictions Rule (ch. 173-339 WAC, WSR 25-18-057, eff. 2025-09-28) · RCW 70A.560.005-.900 (2023 c 455); WAC 173-339-110 · From 2027-01-01 · intentionally added formaldehyde releaser (WAC 173-339-110(2)(b) table), incl. aliases of name and CAS RN; existing in-state retailer stock may be sold until 2028-01-01 (Ecology: until 2027-12-31)
Source: Washington — Toxic-Free Cosmetics Act (Substitute House Bill 1047, Chapter 455, Laws of 2023) · checked Oct 16, 2026
Banned in some U.S. states OR-SB546
Conditions: Oregon: Toxic-Free Cosmetics Act (SB 546, Or. Laws 2023 ch. 575) · ORS 431A.345 · From 2027-01-01 · intentionally added (our mapping from Washington's named list) · Matched by our INCI mapping of a substance class
Source: Oregon — Toxic-Free Cosmetics Act (SB 546, Or. Laws 2023 ch. 575) · checked Oct 16, 2026
How Dimethyl Oxazolidine 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): <사용제한성분> * 【제한】 적용 및 사용범위 : (a) 씻어내지 않는 제품 (b) 씻어내는 제품 * 【화장품 중 최대사용농도】 배합한도 (일반) : (a) 0.25% (b) 1.세틸,옥타데실 트리메틸 염화암모늄：2.5%(단일 혹은 그 합으로 계산함) 2.도코실 트리메틸 염화암모늄：5.0%(以단일 혹은 세틸 트리메틸염화암모늄과 옥타데실트리메틸 염화암모늄의 합으로 계산); 세틸, 옥타데실트라이메틸암모늄클로라이드, 알킬트라이메틸암모늄클로라이드 각 농도의 합은 2.5% 미만이어야 함 <사용제한 방부제> * 【화장품 중... |
| AS ASEAN (10 countries) | Restricted | MFDS summary (Korean): * 【Restrictions】 Maximum authorised concentration in the finished cosmetic product : 0.1% * 제한 【완제품에서 허용된 최대 농도】 : 0.1% * 【Restrictions】 Other limitations and requirements : The pH of the finished product must not be lower than 6 * 제한 【기타 제한 및 요구조건】 : 완제품의 pH가 6 이하이면 안된다. |
| TW Taiwan | Restricted | MFDS summary (Korean): ※ 未列於本表中之防腐劑成分，倘歐、美、日三國家地區政府已公告准用且有其限量管制規定者，我國亦依其限用標準准予使用。 倘前述三國家地區政府管理有差異時，則採其中限量規定方式最安全者。 ※ 本表所稱之口腔製劑，包含非藥用牙膏、漱口水類及美白牙齒類等化粧品。 * 단서조항 : ※ 未列於本表中之防腐劑成分，倘歐、美、日三國家地區政府已公告准用且有其限量管制規定者，我國亦依其限用標準准予使用。 倘前述三國家地區政府管理有差異時，則採其中限量規定方式最安全者。 ※ 本表所稱之口腔製劑，包含非藥用牙膏、漱口水類及美白牙齒類等化粧品。 ※ 본 표에 열거되지 않은 방부제 성분은 유럽, 미국,... |
| BR Brazil | Restricted | MFDS summary (Korean): * Restrictions 【Maximum concentration permitted at final product】 : 0.1% * 제한 【완제품에서 허용된 최대 농도】 : 0.1% * Restrictions 【Other limitations and requirements】 : The pH of the finished product should not be less than 6. * 제한 【기타 제한 및 요구조건】 : 완제품의 pH는 6 미만이면 안된다. |
| AR Argentina | Restricted | MFDS summary (Korean): * Restrictions 【Maximum concentration permitted at final product】 : 0.1% * 제한 【완제품에서 허용된 최대 농도】 : 0.1% * Restrictions 【Other limitations and requirements】 : The pH of the finished product should not be less than 6. * 제한 【기타 제한 및 요구조건】 : 완제품의 pH는 6 미만이면 안된다. |
Source: MFDS cosmetic ingredient use restrictions — overseas regulations · checked Oct 16, 2026
DIMETHYL OXAZOLIDINE 디메칠옥사졸리딘 4,4-디메칠-1,3-옥사졸리딘(디메칠옥사졸리딘)
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.