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Ingredient Dictionary

CALCIUM HYDROXIDE

Calcium dihydroxide is a calcium hydroxide.

Korean limit
7%
Molecular structure

How much products actually contain

No product states its amount yet.

Of the products containing it, 4 list it before the 1% line and 0 after it (usually 1% or less).

Products using this ingredient

4 of 4 confirmed · likeliest to carry enough first

Definition

Calcium dihydroxide is a calcium hydroxide. It has a role as an astringent.

Source: PubChem

US FDA substance register · UNII PF5DZW74VN · registered name Calcium hydroxide · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

Cosmetic roles

Keeps pH steadyBUFFERING

Safety & regulatory references

Restricted
South Korea · Taiwan · United Kingdom

Source: ASEAN Cosmetic Directive · EU Cosmetics Regulation · MFDS (Korea) cosmetic regulatory information · Taiwan FDA cosmetic ingredients · Taiwan FDA cosmetic regulations · UK cosmetics regulations (OPSS)

Argentina · Brazil

  • 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)
  • Maximum concentration permitted at final product : a) 7% by weight of calcium hydroxide b) to pH 12.7 c) to pH 11
  • Use conditions and warnings that must appear on the label : a.- Contains alkali. Avoid contact with eyes. Can cause blindness. Keep out of reach of children b.- Contains alkali. Avoid contact with eyes. Keep out of reach of children

ASEAN

  • 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)
  • Maximum authorised concentration in the finished cosmetic product : (a) 7% by weight calcium hydroxide
  • Other limitations and requirements : (b) pH value not to exceed pH 12.7 (c) pH value not to exceed pH 11
  • Conditions of use and warning which must be printed on the labels : (a) • Contains alkali • Avoid contact with eyes • Can cause blindness • Keep out of reach of children (b) • Contains alkali • Keep out of reach of children • Avoid contact with eyes

China

  • Maximum concentration : (a) 7%
  • (b) pH≤12.7+V26
  • (c) pH≤11

European Union

  • Product Type, body parts : (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)
  • Maximum concentration in ready for use preparation : (a) 7% (as calcium hydroxide)
  • Other : (b) pH < 12.7 (c) pH < 11
  • Wording of conditions of use and warnings : (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: MFDS (Korea) cosmetic regulatory information

Not classified under Korea’s toxic-substance GHS list · existing chemical substance

Source: Korea toxic substances GHS register (NIER)

EU Cosmetics Regulation, Annex III (restricted substances), entry 15c · maximum concentration (a) 7% (as calcium hydroxide) · applies to (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)

Source: EU restricted substances (Annex III)

Restriction III/15c

Source: EU CosIng ingredient list

Reviewed by CIR: Safety Assessment of Inorganic Hydroxides as Used in Cosmetics

Source: US Cosmetic Ingredient Review (CIR)

More data — names, identifiers, properties, test records, literature

Official labels & definitions

JCIA labelling name 水酸化Ｃａ: 本品は、カルシウムの水酸化物であり、次の化学式で表される。

Source: JCIA labelling names (Japan)

Names & identifiers

CALCIUM HYDROXIDEINCI칼슘하이드록사이드Korean label name (MFDS standard)Calcium hydroxide (Ca(OH)2)Synonym水酸化ＣａJapanese labelling name
CAS No.chemical registry number
1305-62-0
EC No.EU chemical inventory number
215-137-3
DTXSIDUS EPA chemical ID
DTXSID7034410
DTXCIDUS EPA compound ID
DTXCID5014410
IUPAC
Calcium dihydroxide
Molecular formula
CaH2O2
Molecular weight
74.092 g/mol

Measured properties

Colour
white, colourless
Odour
odourless
pH
12.4
Melting/freezing point
580 ℃
Water solubility
0.185 g/100㎖ (0℃)
Relative density
2.2
Decomposition temperature
580 ℃
Molecular weight
74.1

Values measured on the substance itself. The KOSHA data are a reference for writing and reviewing safety data sheets, not a specification for a commercial raw material.

Source: KOSHA safety data sheets (Korea)

What products actually use it for

What the 110 products reported to the US EPA with this ingredient use it for. Products outside cosmetics are included, so the top few rows are its main uses.

  • pH regulating agent42
  • Catalyst10
  • Processing aids not otherwise specified8
  • Filler7
  • Soil amendments4
  • Chemical reaction regulator4
  • Intermediate4
  • Surfactant (surface active agent)3
18 other uses
  • Drier3
  • Flocculating agent3
  • Lubricating agent2
  • Hardener2
  • Dehydrating agent (desiccant)2
  • Stabilizing agent2
  • Binder2
  • Heat stabilizer2
  • Corrosion inhibitor1
  • Flame retardant1
  • Viscosity modifier1
  • Pigment1
  • Degradant/impurity (EPA)1
  • Flavouring and nutrient1
  • Reducing agent1
  • Solids separation (precipitating) agent, not other1
  • Fuel1
  • Absorbent1

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

8 skin studies and 6 eye studies are on record.

Classed as highly irritating1Classed as moderate1Classed as low3

The studies disagree (the most common conclusion covers 20%), so they do not establish that this ingredient is irritating. These tests are on the raw material itself; irritation at the amount in a finished product is a different question.

See all 14 studies
  • Category 8.2C (Category 1C)
    Skin Irritation · Read Across
  • Classification not possible
    Skin Sensitization · Screening
  • Category 2
    Skin Irritation · Screening
  • Skin irritation - category 2
    Skin Irritation · Screening
  • Not likely to be sensitizing
    skin sensitisation: in vivo (LLNA) · Screening · according to OECD Guideline 429 (Skin Sensitisation: Local Lymph Node Assay) according to EU Method B.42 (Skin Sensitisation: Local Lymph Node Assay)
  • Studies Indicate No Significant Irritation
    skin irritation: in vivo · Screening · OECD Guideline 404 (Acute Dermal Irritation / Corrosion) , adopted 1992-07-17 according to
  • Studies Indicate No Significant Irritation
    skin irritation: in vivo · Screening · OECD Guideline 404 (Acute Dermal Irritation / Corrosion) according to EU Method B.4 (Acute Toxicity: Dermal Irritation / Corrosion) according to
  • Skin corrosion/irritation - Category 1
    Skin Irritation · Screening
  • Category 8.3A (Category 1)
    Eye Irritation · Read Across
  • Eye damage - category 1
    Eye Irritation · Screening
  • Category 1
    Eye Irritation · Screening
  • Studies Indicate No Significant Irritation
    eye irritation: in vivo · Screening · OECD Guideline 405 (Acute Eye Irritation / Corrosion) according to EU Method B.5 (Acute Toxicity: Eye Irritation / Corrosion) according to
  • Corrosive or Irritation Persists for &gt; 21 days
    eye irritation: in vivo · Screening · OECD Guideline 405 (Acute Eye Irritation / Corrosion) , adopted 1987-02-24 according to
  • Severe Irritation
    eye irritation: in vivo · Screening · OECD Guideline 405 (Acute Eye Irritation / Corrosion) , adopted 1987-02-24 equivalent or similar to

Source: US EPA CompTox dashboard

Related literature

Linked databases 27

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