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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Reference substances

Reference substances

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IUPAC name:
Iron hydroxide oxide

Inventory

EC number:
257-098-5
EC name:
Iron hydroxide oxide yellow
CAS number:
51274-00-1
Description:
This substance is identified in the Colour Index by Colour Index Constitution Number, C.I. 77492.
CAS number:
51274-00-1
Synonyms
Names:
C.I. 77492
C.I. Pigment Yellow 42
Ferrous oxide hydroxide
Iron oxide yellow
Iron(III)oxide hydroxide
Yellow iron oxide

Molecular and structural information

Molecular formula:
Fe(OH)O
Molecular weight:
88.85
Structural formula:
Chemical structure

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