Korean: 칼슘하이드록사이드 · CAS 1305-62-0 · Functions: buffering
Restricted MFDS restricted ingredients
Conditions (official MFDS text, Korean):
* 배합한도 : ∙ 헤어스트레이트너 제품에 7%
∙ 제모제에서 pH조정 목적으로 사용되는 경우 최종 제품의 pH는 12.7이하
∙ 기타 제품에는 사용금지
Source: MFDS — cosmetic ingredient use restrictions · checked Oct 16, 2026
Restricted Annex III/15c
Maximum: (a) 7% (as calcium hydroxide)
Conditions: Product type: (a) Hair straighteners containing two components: calcium hydroxide and a guanidine salt (b) pH ajuster for depilatories (c) Other uses (e.g. pH adjuster, processing aid) (b) pH < 12.7 (c) pH < 11
Required label warning: (a) Contains alkali Avoid contact with eyes Keep out of reach of children Can cause blindness (b) Contains alkali Keep out of reach of children Avoid contact with eyes
Source: EU CosIng — Annex III · checked Oct 16, 2026
No specific rule on file. The FDA regulates few cosmetic ingredients by name; no rule does not mean approval.
How Calcium Hydroxide 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): * 【제한】 적용 및 사용범위 : (a) 수산화칼슘과 구아니딘염을 함유한 두발퍼머제 (b) 탈모제용 pH조절약 (c) 기타용도, 예를 들어, pH조절약 등 * 【화장품 중 최대사용농도】 배합한도 (일반) : (a) 7%(수산화칼슘 중량으로 계산) * 기타 제한조건 및 요구사항 : (b) pH≤12.7+V26 (c) pH≤11 * 라벨에 반드시 표기해야하는 사용조건과 주의사항 : (a) 강한 염기성 함유 : 눈 부위 접촉을 피하고 실명을 유발할 수 있음. 어린이의 손이 닿지 않도록 보관 (b) 강한... |
| AS ASEAN (10 countries) | Restricted | MFDS summary (Korean): * 【Restrictions】 Field of application and/or use : (a) Hair straighteners containing two components: calcium hydroxide and a guanidine salt (b) pH adjuster – for depilatories (c) Other uses (eg. pH adjuster, processing aid) * 제한 【사용 범위】 : (a) 다음의 두 성분을 함유하고 있는 헤어 스트레이트닝에서 : 칼슘 하이드록사이드 및... |
| TW Taiwan | Restricted | MFDS summary (Korean): ※ 染髮、脫色、脫染及燙髮產品之應刊載之注意事項，應依衛生福利部公告刊載之。 ※ 染髮產品之限量標準：係指該成分依產品使用說明書混合後之最高允許使用量。 ※ 化粧品之外包裝或容器，應明顯標示本表所列成分之注意事項。因外包裝或容器表面積過小或其他特殊情形致不能標示者，應於標籤、仿單或以其他方式刊載之。 ※ 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。 ※ 化粧品宣稱效能者，須符合化粧品標示宣傳廣告涉及虛偽誇大或醫療效能認定準則規定。 * 단서조항 : ※ 染髮、脫色、脫染及燙髮產品之應刊載之注意事項，應依衛生福利部公告刊載之。 ※... |
| BR Brazil | Restricted | MFDS summary (Korean): * Restrictions 【Field of application and/or use】 : (a) hair straighteners containing two components: calcium hydroxide and a guanidine salt (b) For pH adjustment in depilatories c.- Other applications (eg. pH adjustment, assist in the process of manufacturing) * 제한 【사용 범위】 : (a) 다음의 두 성분을 포함하고... |
| AR Argentina | Restricted | MFDS summary (Korean): * Restrictions 【Field of application and/or use】 : (a) hair straighteners containing two components: calcium hydroxide and a guanidine salt (b) For pH adjustment in depilatories c.- Other applications (eg. pH adjustment, assist in the process of manufacturing) * 제한 【사용 범위】 : (a) 다음의 두 성분을 포함하고... |
Source: MFDS cosmetic ingredient use restrictions — overseas regulations · checked Oct 16, 2026
CALCIUM HYDROXIDE 칼슘하이드록사이드
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 “Restricted” (EU CosIng — Annex III). The maximum allowed is (a) 7% (as calcium hydroxide). A restricted ingredient is allowed 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: buffering.
Korea's MFDS standard Korean name is 칼슘하이드록사이드.
CAS 1305-62-0 (from official records).