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Iron(III) hydroxide oxide, yellow, synthetic (Iron oxide yellow; Pigment Yellow 42, C.I. 77492)

Product information "Iron(III) hydroxide oxide, yellow, synthetic (Iron oxide yellow; Pigment Yellow 42, C.I. 77492)"

Synthetic yellow iron oxide is an inorganic yellow iron pigment. The product offered here is chemically iron(III) oxide-hydroxide (FeOOH). “Yellow iron oxide” and “iron oxide yellow” are the common trade names; iron(III) oxide-hydroxide describes the chemical composition more precisely.

Properties and applications

Yellow iron oxide is commonly used as an inorganic pigment for colouring. Iron(III) oxide-hydroxide may also be of interest as a functional raw material for industrial development, testing and research. Its suitability for a particular application depends, among other things, on the formulation, processing conditions and required product properties.

Product specifications

Property Specification / range Result
Chemical composition, expressed as FeOOH ≥ 95 % 99.97 %
Oil absorption 25–35 g/100 g 31 g/100 g
Water-soluble matter ≤ 0.3 % 0.20 %
pH value 3–7 5.8
Volatile matter at 105 °C ≤ 1 % Complies
Hiding power 95–105 % 100 %
Particle size fraction above 45 µm ≤ 0.3 % < 0.01 %

Product identification and storage

Product Synthetic yellow iron oxide
Chemical name Iron(III) oxide-hydroxide
Formula FeOOH
CAS number 51274-00-1
Storage Store in a dry, well-ventilated place at 5–35 °C; protect from direct sunlight. See the label for further information.

Frequently asked questions (FAQ)

What is the difference between yellow iron oxide and iron(III) oxide-hydroxide?

There is no difference. “Yellow iron oxide” or “iron oxide yellow” is the trade name for the chemical compound iron(III) oxide-hydroxide (FeOOH).

What is synthetic yellow iron oxide used for?

Synthetic yellow iron oxide is used as an inorganic pigment for colouring and as a raw material in industrial development, testing and research processes.

How should yellow iron oxide be stored?

Yellow iron oxide should be stored in a dry, well-ventilated place at 5–35 °C and protected from direct sunlight.

What is the CAS number for yellow iron oxide (FeOOH)?

The CAS number for iron(III) oxide-hydroxide is 51274-00-1.

Also known as: Eisen(III)-oxidhydrat Eisenhydroxidoxid C. I. Pigment Yellow 42 (Chinesischgelb) C. I. Pigment Yellow 43 (Mapicogelb)
CAS-Nr.: 51274-00-1
Color: Gelb
Flüchtige Bestandteile (ISO 787/2): < 1,0 %
Stoffgruppe: Oxide
material: Eisen(III)-hydroxidoxid
purity: mind 95,0 % (als FEOOH)
zur GPSR-Informationspflicht: Hersteller + Verantwortliche Person: Werth-Metall, Ringstr. 41b, 99428 Grammetal, info@werth-metall.de
Ölzahl (ISO 787/5): 25 - 35 g/100g

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