Description

Pigment Red 81:1 is a high-performance, precipitated calcium salt lake pigment known for its bright, bluish-red shade and excellent lightfastness. This pigment is valued for its strong tinting strength and good chemical resistance, making it a reliable colorant for demanding applications. It is primarily sought after by manufacturers in the printing ink, plastics, and coatings industries who require consistent, vibrant red coloration.

Application

• Printing Inks: A key colorant for offset, gravure, and flexographic inks, especially for packaging and publications.
• Plastics Coloring: Used for coloring PVC, polyolefins, and other polymers in masterbatch and compound formulations.
• Industrial Coatings and Paints: Provides durable coloration for architectural paints, industrial finishes, and decorative coatings.
• Textile Printing: Employed in pigment printing pastes for fabrics.
• Paper Coatings: Used to impart color to high-quality coated papers and specialty papers.
• Artist Colors: A component in professional-grade acrylics, oils, and watercolors.
• Leather Finishing: Applied in dyes and finishes for colored leather goods.

Basic Information

Product Name	Pigment Red 81:1
CAS No.	80083-40-5
Molecular Formula	C28H20N4O6S2.1/2 Ca
Molecular Weight	Contact for details
Synonyms	Pigment Red 81:1; C.I. Pigment Red 81:1; Calcium 4-[(5-chloro-4-methyl-2-sulfophenyl)azo]-3-hydroxy-2-naphthalenecarboxylate; Lithol Rubine BK; Permanent Red F5RK; Red 81:1; C.I. 45160:1; Pigment Red 81 Calcium Salt; Rubine Toner; Calcium Lithol Rubine
EINECS	279-409-3

Quality Control

Our production of Pigment Red 81:1 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Each lot is tested against key parameters including color strength, hue, particle size distribution, and chemical resistance. A Certificate of Analysis (COA) documenting these results is provided with every shipment to guarantee compliance with your specifications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials. This product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Red Powder
Color Strength	100 ± 5% (vs. Standard)
Hue	Standard
Lightfastness	≥ 6-7 (ISO 105-B02)
Heat Resistance	≥ 180°C
Oil Absorption	40 - 60 g/100g
Moisture Content	≤ 2.0%
Residue on Sieve (325 mesh)	≤ 0.5%

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