Description

Umber CAS NO 12713-03-0 is a naturally occurring inorganic pigment composed primarily of iron and manganese oxides. This versatile earth pigment is valued for its excellent lightfastness, chemical stability, and rich, warm brown coloration. It is an essential raw material for manufacturers in the coatings, construction, plastics, and artist materials industries seeking durable, cost-effective, and naturally sourced pigments.

Application

• Paints & Coatings: Used in industrial, architectural, and protective coatings for its opacity, UV resistance, and earthy tones.
• Construction Materials: Incorporated into concrete, mortar, paving stones, and roofing tiles for integral coloring and aesthetic enhancement.
• Plastics & Polymers: Serves as a colorant and filler in masterbatches for various plastic products, including films, pipes, and profiles.
• Artist & Decorative Paints: A fundamental pigment in oil, acrylic, and watercolor paints, valued for its transparency and mixing properties.
• Printing Inks: Employed in specialty and packaging inks where specific brown shades are required.
• Paper & Leather Finishing: Used in the surface treatment and coloring of specialty papers and leather goods.

Basic Information

Product Name	Umber
CAS No.	12713-03-0
Molecular Formula	Fe₂O₃·MnO₂·nH₂O + SiO₂ + Al₂O₃ (Complex natural mixture)
Molecular Weight	N/A (Natural mineral pigment)
Synonyms	Raw Umber; Burnt Umber; Pigment Brown 7 (CI 77491); CI 77492; CI 77499; Natural Brown 7; Iron Manganese Oxide; Earth Pigment; Turkey Umber; Cyprus Umber
EINECS	235-814-3

Quality Control

Our Umber pigment is sourced and processed under strict quality protocols to ensure batch-to-batch consistency in color, particle size, and chemical composition. Quality is verified against key parameters including color value (L*a*b*), particle size distribution, oil absorption, and residue on sieve. A Certificate of Analysis (COA) detailing these specifications is provided with every shipment.

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 stable under normal storage conditions.

Specification

Item	Specification
Appearance	Fine Brown Powder
Color Index	Pigment Brown 7 (CI 77491/77492/77499)
Iron Oxide (Fe₂O₃) Content	45 - 60 %
Manganese Oxide (MnO₂) Content	5 - 20 %
Moisture Content	≤ 1.0 %
Residue on Sieve (325 mesh)	≤ 0.5 %
Oil Absorption	25 - 35 g/100g
pH Value (10% slurry)	5.0 - 7.5

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