Lithium hydroxide is an alkali metal hydroxide.
- Korean limit
- 4.5%
Definition
Lithium hydroxide is an alkali metal hydroxide.
Source: PubChem
US FDA substance register · UNII 903YL31JAS · registered name Lithium hydroxide anhydrous · single chemical substance
Cosmetic roles
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 1. General Use 2. Professional use (b) To adjust pH depilatories (c) For pH adjustment in other products (only for products intended to be rinsed)
- Maximum concentration permitted at final product : to) 1. 2% by mass 2. 4.5% by mass (a) 1 and 2 The concentration of lithium hydroxide is calculated by weight sodium hydroxide. In the case of mixtures, the sum should not exceed the maximum authorized concentration in the final product (b) Up to pH 12.7 (c) Up to pH 11
- Use conditions and warnings that must appear on the label : a) 1. Contains alkali Avoid contact with eyes. Can cause blindness. Keep out of the reach of children. a) 2. For professional use onlyContains alkali Avoid contact with eyes. Can cause blindness b) and c) Contains alkali. Avoid contact with eyes. Keep out of reach of children
ASEAN
- Field of application and/or use : (a) Hair straightener 1. General use 2. Professional use (b) pH adjuster – for depilatories (c) Other uses as pH adjuster (for rinse-off products only)
- Maximum authorised concentration in the finished cosmetic product : (a) 1. 2% by weight (6) 2. 4.5% by weight (6)
- Other limitations and requirements : (a) pH value not to exceed pH 12.7 (b) pH value not to exceed pH 11
- Conditions of use and warning which must be printed on the labels : (a) 1. • Contains alkali • Avoid contact with eyes • Can cause blindness • Keep out of reach of children 2. • For Professional use only • Avoid contact with eyes • Can cause blindness (b) • Contains alkali • Keep out of reach of children • Avoid contact with eyes
China
- Maximum concentration : (a)
- 1. 2%
- 2. 4.5%
- (b) pH≤12.7
- (c) pH≤11
European Union
- Product Type, body parts : (a) Hair straightener (b) pH ajuster for depilatories (c) Other uses as pH ajuster (for rinse-off products only)
- Maximum concentration in ready for use preparation : (a) 1. 2% (6) 2. 4.5% (6)
- Other : (a) 1. General use 2. Professional use (b) pH < 12.7 (c) pH < 11
- Wording of conditions of use and warnings : (a) 1. Contains alkali Avoid contact with eyes Can cause blindness Keep out of reach of children 2. Avoid contact with eyes Can cause blindness (b) Contains alkali Keep out of reach of children Avoid contact with eyes
Source: MFDS (Korea) cosmetic regulatory information
Korea’s toxic-substance GHS classification: Danger · H314 (category 1B)
EU Cosmetics Regulation, Annex III (restricted substances), entry 15b · maximum concentration (a) 1. 2% (6) 2. 4.5% (6) · applies to (a) Hair straightener (b) pH ajuster for depilatories (c) Other uses as pH ajuster (for rinse-off products only)
Restriction III/15b
Source: EU CosIng ingredient list
More data — names, identifiers, properties, test records, literature
Names & identifiers
- CAS No.chemical registry number
- 1310-65-2
- EC No.EU chemical inventory number
- 215-183-4
- DTXSIDUS EPA chemical ID
- DTXSID70893845
- DTXCIDUS EPA compound ID
- DTXCID801323885
- IUPAC
- Lithium hydroxide
- Molecular formula
- HLiO
- Molecular weight
- 23.95 g/mol
Measured properties
- Appearance
- solid
- pH
- (14)
- Melting/freezing point
- (450 C)
- Water solubility
- (12.8%)
- Relative density
- (2.5)
- Molecular weight
- (23.95)
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 17 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.
- Processing aids not otherwise specified4
- Intermediate3
- Lubricating agent2
- Absorbent2
- Dye2
- Hair waving or straightening (EPA)1
- Viscosity modifier1
- pH regulating agent1
1 other uses
- Catalyst1
Source: US EPA CompTox dashboard
Irritation and sensitisation studies
7 skin studies and 3 eye studies are on record.
The studies disagree (the most common conclusion covers 33%), 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 10 studies
- Classification not possible
Skin Sensitization · Screening - Category 1
Skin Irritation · Screening - Category 6.3A (Category 2)
Skin Irritation · Read Across - Not likely to be sensitizing
skin sensitisation: in vivo (non-LLNA) · Screening · according to OECD Guideline 406 (Skin Sensitisation) 1981 according to EU Method B.6 (Skin Sensitisation) 1987 according to EPA OPP 81-6 (Skin Sensitisation) 1984 - Skin corrosion/irritation - Category 1
Skin Irritation · Screening - Category 8.2B (Category 1B)
Skin Irritation · Read Across - Not likely to be sensitizing
skin sensitisation: in vivo (non-LLNA) · Screening · according to OECD Guideline 406 (Skin Sensitisation) 1992 according to EU Method B.6 (Skin Sensitisation) 1992 according to EPA OPP 81-6 (Skin Sensitisation) 1984 - Category 6.4A (Category 2A)
Eye Irritation · Read Across - Category 1
Eye Irritation · Screening - Category 8.3A (Category 1)
Eye Irritation · Read Across
Source: US EPA CompTox dashboard
Related literature
- The pH of lye and no-lye hair relaxers, including those advertised for children, is at levels that are corrosive to the skin. · 2019
- Acute health effects of accidental exposure to lithium hydroxide at a battery material production plant · 2026
- Evaluation of Health Hazards in Secondary Battery Industry Workers Focusing on Chemical Burns · 2026
- Cytotoxic Evaluation of Hair Relaxers and Straighteners Actives in Human-Derived Skin Cells · 2021
- Risk assessment of lithium-ion battery explosion: chemical leakages · 2018
Linked databases 25
- ASEAN Cosmetic Directive
- Australian Industrial Chemicals Inventory (AICIS)
- ChEBI
- China inventory of existing ingredients (IECIC)
- EU CosIng ingredient list 2
- EU Cosmetics Regulation
- EU restricted substances (Annex III)
- Korea Cosmetic Association ingredient dictionary
- Korea toxic substances GHS register (NIER)
- KOSHA safety data sheets (Korea)
- MFDS (Korea) cosmetic ingredient register 2
- MFDS (Korea) cosmetic regulatory information 2 3 4
- NIST Chemistry WebBook
- PubChem
- Taiwan FDA cosmetic ingredients
- Taiwan FDA cosmetic regulations
- Tlooto literature search 2 3 4 5
- UK cosmetics regulations (OPSS)
- UniChem cross-reference IDs
- US EPA CompTox dashboard 2
- US EPA DSSTox chemical database
- US FDA substance registration (GSRS)
- US FDA Unique Ingredient Identifier (UNII)
- Wikidata
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