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InventoryRef 3283012/08/2020

CI 77492

Iron oxide

CI 77492 is linked to 3 EU annex records on this page. Inventory note: IV/136.

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Regulatory evidence by market

This matrix separates verified ingredient rules from sources that are mapped but not yet imported. No imported rule does not mean the ingredient is permitted.

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MarketEvidence statusRecordsSource language
European UnionEvidence linked
Positive-list entry with conditions
Open this evidence		3English and EU languages
Great BritainEvidence linked
Permitted list with conditions
Open this evidence		1English
CanadaSource mapped
Official source mapped; ingredient rule not imported
0English and French
New ZealandEvidence linked
Permitted list with conditions
Open this evidence		1English
ASEANSource mapped
Official source mapped; ingredient rule not imported
0English and national languages
ChinaSource mapped
Official source mapped; ingredient rule not imported
0Chinese with selected English material
JapanSource mapped
Official source mapped; ingredient rule not imported
0Japanese; official English translation available
South KoreaSource mapped
Official source mapped; ingredient rule not imported
0Korean with some English names
United StatesSource mapped
Official source mapped; ingredient rule not imported
0English
AustraliaSource mapped
Official source mapped; ingredient rule not imported
0English
BrazilSource mapped
Official source mapped; ingredient rule not imported
0Portuguese with INCI crosswalks
IndiaSource mapped
Official source mapped; ingredient rule not imported
0English and Hindi
Saudi ArabiaSource mapped
Official source mapped; ingredient rule not imported
0Arabic and English

Chemical identity and properties

PubChem 2D chemical structure for CAS 20344-49-4
CAS 20344-49-4PubChem CID 9793696

iron hydroxide oxide (Fe(OH)O)

Ferric oxyhydroxide is a Phosphate Binder. The mechanism of action of ferric oxyhydroxide is as a Phosphate Chelating Activity. — FDA Pharm Classes

IUPAC name
iron(3+);oxygen(2-);hydroxide
Molecular formula
FeHO2
Molecular weight
88.85 g/mol
Exact mass
88.932590 Da
Topological polar surface area
2.0 Ų
Hydrogen-bond donors
1
Hydrogen-bond acceptors
2
Covalent units
3
Defined stereocentres
0

Also known as

Ferric oxyhydroxideFerric hydroxide oxideFERRIC OXY-HYDROXIDEIRON HYDROXIDE OXIDE (FEO(OH))5Fe2O3.9H2OFERRIC OXYHYDROXIDE (FEO2H)FERRIC HYDROXIDE OXIDE (FEOOH)Proferdex
10 more reported names
RefChem:791334243-746-487PZU03K0KIron hydroxide oxideiron(III) oxyhydroxideFeHO2ferric;oxygen(2-);hydroxideFERRIC HYDROXIDE [MI]IEECXTSVVFWGSE-UHFFFAOYSA-MIron(3+) hydroxide oxide (1/1/1)
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

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

PubChem 2D chemical structure for CAS 51274-00-1
CAS 51274-00-1PubChem CID 23320441

C.I. Pigment Yellow 42

IUPAC name
iron(3+);oxygen(2-);hydroxide;hydrate
Molecular formula
FeH3O3
Molecular weight
106.87 g/mol
Exact mass
106.943154 Da
Topological polar surface area
3.0 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
3
Covalent units
4
Defined stereocentres
0

Also known as

Ferric oxide YellowEX438O2MRTC.I. 77492RefChem:1080569Yellow iron oxideFerric oxide, yellowBayferrox 920UNII-EX438O2MRT
16 more reported names
Iron hydroxide oxide yellowFerric oxide, yellow [NF]CCRIS 4378EINECS 257-098-5MAPICO YELLOWIRON OXIDE,YELLOWFERRIC OXIDE,YELLOWEC 257-098-5HYDRATED FERRIC-OXIDEFERRIC OXIDE, HYDRATEDINS NO.172(III)INS-172(III)FERRIC OXIDE YELLOW [II]FERRIC OXYHYDROXIDE HYDRATEHYDRATED IRON (III) OXIDEIRON OXIDE,YELLOW [VANDF]
Open full PubChem recordPubChem annotations3D structure image

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for CI 77492

INCI name

CI 77492

Description

Iron oxide

Record provenance

Inventory reference
32830
Imported identity
CI 77492
Source update
12/08/2020
European Commission CosIng source notes
Annex IV Shared CAS number
Entry 135

CI 77491

CAS: 1345-25-1; 1345-27-3; 1309-37-1; 1317-61-9; 52357-70-7
EC: -; 215-722-3; 215-168-2; -; 257-870-1
Annex IV Restriction reference
Entry 136

CI 77492

CAS: 51274-00-1
EC: 257-098-5
Annex IV Shared CAS number
Entry 137

CI 77499

CAS: 12227-89-3; 1309-37-1; 1317-61-9; 1345-25-1; 1345-27-3; 52357-70-7
EC: 235-442-9; 215-168-2; 215-277-5; 215-721-8; 215-722-3; 257-870-1

Key data

CAS
51274-00-1 / 1345-27-3 / 20344-49-4 / 52357-70-7
EC
257-098-5 / 215-722-3 / 215-570-8 / 257-670-1
Restriction
IV/136
Function
COLORANT
Exclusively or mainly intended to colour the cosmetic product, the body as a whole or certain parts thereof, by absorption or reflection of visible light. All authorised colorants are substances in the positive list of Annex IV to the Cosmetics Regulation 1223/2009.

Official EU ingredient-name evidence

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

#6475 · CI 77492

Ingredients with overlapping formulation functions

CI 77400COLORANT
CI 77480COLORANT
CI 77489COLORANT
CI 77491COLORANT
CI 77499COLORANT
CI 77510COLORANT
CI 77713COLORANT
CI 77742COLORANT

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 chemicalsPubChem PUG RESTEU Safety Gate cosmetic product alertsECHA CHEMUS EPA CompToxCosmetic Ingredient Review safety assessmentsFDA Global Substance Registration SystemILO/WHO International Chemical Safety CardsJapan NITE-CHRIPNIOSH Pocket Guide to Chemical HazardsOECD eChemPortal

How CI 77492 appears in the CosIng inventory

The CosIng inventory lists CI 77492 as a cosmetic ingredient and this page links it to 3 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

CI 77492 is also tagged with 1 cosmetic function 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

CI 77492 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 CI 77492 reads: "IV/136". 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, CI 77492 carries the following function designation(s):

CAS 51274-00-1 / 1345-27-3 / 20344-49-4 / 52357-70-7 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.

Use the INCI Checker to screen a full ingredient list across selected markets, or compare this substance across all supported market datasets.
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Source note for CI 77492

This page combines the CosIng inventory entry for CI 77492 with 3 linked Annex II–VI records from the local dataset built from public European Commission cosmetic ingredient materials.

Use this inventory page to research CI 77492 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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