What does the restriction note for AMMONIUM HYDROXIDE mean?

The restriction field for AMMONIUM HYDROXIDE reads: III/4. This is the restriction note from the CosIng inventory. For authoritative conditions and limits, always refer to the linked annex entries.

What other records share CAS 1336-21-6?

CAS 1336-21-6 may appear across multiple EU annex records. The CAS lookup page shows all Annex II–VI entries sharing this identifier, useful for identifying cross-annex regulatory status of the same chemical substance.

How do I check if my formula contains AMMONIUM HYDROXIDE?

Use the INCI Checker to screen a full ingredient list across selected markets, or use the substance market comparison to review this identity across all supported market datasets.

InventoryRef 3187015/10/2010

AMMONIUM HYDROXIDE

Ammonium hydroxyde

AMMONIUM HYDROXIDE is linked to 1 EU annex record on this page. Inventory note: III/4.

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Regulatory evidence by market

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Market	Evidence status	Records	Source language
European Union	Evidence linked Restricted entry found Open this evidence	1	English and EU languages
Great Britain	Source mapped Official source mapped; ingredient rule not imported	0	English
Canada	Source mapped Official source mapped; ingredient rule not imported	0	English and French
New Zealand	Evidence linked Restricted Open this evidence	1	English
ASEAN	Source mapped Official source mapped; ingredient rule not imported	0	English and national languages
China	Source mapped Official source mapped; ingredient rule not imported	0	Chinese with selected English material
Japan	Source mapped Official source mapped; ingredient rule not imported	0	Japanese; official English translation available
South Korea	Source mapped Official source mapped; ingredient rule not imported	0	Korean with some English names
United States	Source mapped Official source mapped; ingredient rule not imported	0	English
Australia	Source mapped Official source mapped; ingredient rule not imported	0	English
Brazil	Source mapped Official source mapped; ingredient rule not imported	0	Portuguese with INCI crosswalks
India	Source mapped Official source mapped; ingredient rule not imported	0	English and Hindi
Saudi Arabia	Source mapped Official source mapped; ingredient rule not imported	0	Arabic and English

Chemical identity and properties

PubChem 2D chemical structure for CAS 1336-21-6

CAS 1336-21-6PubChem CID 14923

Ammonium Hydroxide

Ammonium hydroxide is a solution of ammonia in water. It has a role as a food acidity regulator. — ChEBI

IUPAC name: azanium hydroxide

Molecular formula: H5NO
Molecular weight: 35.046 g/mol
Exact mass: 35.037113783 Da
Topological polar surface area: 2.0 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 1
Covalent units: 2
Defined stereocentres: 0

Also known as

Ammonia waterAmmonia aqueousAquammoniaAmmonia, aquaHousehold ammoniaNH4OHAmmonia, monohydrateAmmonia water 29%

16 more reported names

SX 1 (ammonia water)Ammonium hydroxide ((NH4)(OH))CHEBI:18219Hydroxide, AmmoniumRefChem:6613DTXCID8080921-933-8Ammonium hydrateAmmoniumhydroxidCaswell No. 044ammoniumhydroxideAmmonia, aqueousSX 1Ammonia water [JAN]HSDB 5125EINECS 215-647-6

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:18219
EPA DTXSID:DTXSID4020080
PubMed:27867098
PubMed:14750966
PubMed:1581859

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for AMMONIUM HYDROXIDE

INCI name

AMMONIUM HYDROXIDE

Description

Ammonium hydroxyde

Record provenance

Inventory reference: 31870
Imported identity: AMMONIUM HYDROXIDE
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for AMMONIUM HYDROXIDE

Annex III Restriction reference

Entry 4

AMMONIA

CAS: 7664-41-7 / 1336-21-6

EC: 231-635-3 / 215-647-6

Key data

CAS

1336-21-6

215-647-6

Restriction

III/4

Function

BUFFERING: Stabilising the pH of an aqueous medium in a narrow range even if an acid or base is added. Altering and/or maintaining a cosmetic product's pH at the desired level.
DENATURANT: Rendering cosmetics unpalatable. Mostly added to cosmetics containing ethyl alcohol to make it unsuitable for ingestion.

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#1791 · AMMONIUM HYDROXIDE

Ingredients with overlapping formulation functions

ACETONEDENATURANT, FRAGRANCE, SOLVENT

ANETHOLEDENATURANT, FRAGRANCE

BENZALDEHYDEDENATURANT, FLAVOURING, FRAGRANCE, PERFUMING

BORIC ACIDANTIMICROBIAL, BUFFERING, DENATURANT

BRUCINE SULFATEDENATURANT

CAMPHORDENATURANT, FRAGRANCE, PLASTICISER

CARAPA GUAIANENSIS SEED OILDENATURANT, SKIN CONDITIONING

CARAPA GUIANENSIS SEED OILDENATURANT; SKIN CONDITIONING - MISCELLANEOUS

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicals PubChem PUG REST EU Safety Gate cosmetic product alerts ECHA CHEM US EPA CompTox Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal

How AMMONIUM HYDROXIDE appears in the CosIng inventory

The CosIng inventory lists AMMONIUM HYDROXIDE as a cosmetic ingredient and this page links it to 1 annex record. The inventory entry captures names and identifiers, while the annex record shows where the substance is prohibited, restricted or positively listed in EU cosmetics law.

AMMONIUM HYDROXIDE is also tagged with 2 cosmetic functions in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

AMMONIUM HYDROXIDE appears in the EU CosIng inventory and has linked annex records. Check the annex records above for applicable restrictions, concentration limits and conditions of use. Annex II listing means prohibited; Annex III means restricted; Annexes IV, V and VI mean permitted under specified conditions.

The restriction field for AMMONIUM HYDROXIDE reads: "III/4". This is the restriction note recorded in the CosIng inventory for this ingredient. For authoritative conditions and limits, always refer to the linked annex entries above.

According to the EU CosIng inventory, AMMONIUM HYDROXIDE carries the following function designation(s):

CAS 1336-21-6 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

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Source note for AMMONIUM HYDROXIDE

This page combines the CosIng inventory entry for AMMONIUM HYDROXIDE with 1 linked Annex II–VI record from the local dataset built from public European Commission cosmetic ingredient materials.

Use this inventory page to research AMMONIUM HYDROXIDE and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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Tools & next steps

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