Description

Red Ocher CAS NO 37338-85-5 is a naturally occurring inorganic pigment primarily composed of iron oxide, valued for its stable, earthy red hue. This pigment is prized for its excellent lightfastness, chemical stability, and non-toxic properties, making it a reliable and safe coloring agent. It is an essential raw material for industries requiring durable and natural colorants, such as construction, coatings, plastics, and artistic materials.

Application

• Construction Materials: As a pigment for coloring concrete, mortar, paving stones, and roofing tiles.
• Paints & Coatings: Used in industrial primers, marine paints, and architectural coatings for its UV resistance and opacity.
• Plastics & Polymers: Imparts color to PVC, polyolefins, and other polymers for outdoor applications.
• Artists' Materials: A key component in oil paints, acrylics, watercolors, and pastels for fine arts and restoration.
• Ceramics & Pottery: Used in glazes and clay bodies to achieve traditional red and terracotta colors.
• Cosmetics (where approved): As a natural colorant in certain cosmetic formulations like blushes and eyeshadows.

Basic Information

Product Name	Red Ocher
CAS No.	37338-85-5
Molecular Formula	Fe₂O₃·xH₂O (Main component)
Molecular Weight	N/A (Natural mineral mixture)
Synonyms	Red Ochre; Natural Red Iron Oxide; Iron Oxide Red (Natural); CI 77491 (Natural); Terra Rossa; Venetian Red (Natural); Indian Red (Natural); Burnt Sienna (Raw); Red Earth Pigment; Iron(III) Oxide Hydrate (Natural)
EINECS	Contact for details

Quality Control

Our Red Ocher is sourced and processed to meet stringent quality parameters for consistency in color strength and chemical composition. Quality is assured through batch-by-batch testing for key properties such as pigment content, residue on sieve, and soluble salts. Certificates of Analysis (COA) detailing specific lot specifications are available upon request to ensure it meets your application requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials. The product is not hygroscopic under normal storage conditions.

Specification

Item	Specification
Appearance	Reddish-brown powder
Identification (IR)	Conforms to Iron Oxide
Iron Oxide (Fe₂O₃) Content	≥ 85%
Residue on Sieve (325 mesh)	≤ 1.0%
Water Soluble Matter	≤ 1.0%
pH (10% suspension)	5.0 - 8.0
Oil Absorption	15 - 25 g/100g

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