Description

Ferrirubin CAS NO 23425-25-4 is a synthetic iron oxide pigment known for its distinctive red-brown color. This compound is valued for its excellent tinting strength, chemical stability, and lightfastness, making it a reliable colorant for demanding industrial applications. It is primarily utilized by manufacturers in the coatings, plastics, construction materials, and specialty chemical industries seeking consistent, high-performance pigments.

Application

• Coatings and Paints: Used as a durable, weather-resistant pigment in industrial, architectural, and automotive coatings.
• Plastics and Polymers: Imparts stable coloration to a wide range of plastic materials, including PVC, polyolefins, and engineering resins.
• Construction Materials: A key colorant for concrete, mortar, paving stones, and roofing tiles, providing long-lasting color.
• Inks and Toners: Employed in the formulation of printing inks and toners for its color consistency and dispersion properties.
• Cosmetics and Personal Care: Used as a color additive in certain cosmetic formulations where approved, such as in soaps.
• Ceramics and Glass: Provides coloration in the production of ceramic glazes and colored glass.

Basic Information

Product Name	Ferrirubin
CAS No.	23425-25-4
Molecular Formula	Fe₂O₃ (Primary component; often with other metal oxides)
Molecular Weight	159.69 g/mol (for Fe₂O₃)
Synonyms	Iron Oxide Red-Brown; Synthetic Iron Oxide Pigment; CI 77491; Pigment Red 101; Ferric Oxide; Red Iron Oxide; Iron(III) Oxide; Colcothar; Venetian Red; Caput Mortuum
EINECS	Contact for details

Quality Control

Our Ferrirubin is produced under a stringent quality management system to ensure batch-to-batch consistency and performance. Quality parameters including color value, particle size distribution, chemical purity, and heavy metal content are rigorously tested against established specifications. Certificates of Analysis (COA) documenting compliance with relevant industry standards are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product performance.

Specification

Item	Specification
Appearance	Red-Brown Powder
Identification (IR)	Conforms
Assay (as Fe₂O₃)	≥ 96.0%
Loss on Drying	≤ 1.0%
Water Soluble Matter	≤ 0.5%
Particle Size (Median, D50)	0.5 - 1.5 µm
pH (10% Slurry)	5.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm
Arsenic (As)	≤ 3 ppm
Lead (Pb)	≤ 10 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.