Description

Pigment Red 81 is a high-performance, synthetic organic pigment belonging to the xanthene class, valued for its bright and intense red hue. This pigment is engineered to deliver excellent color strength, good dispersibility, and strong tinting power in various formulations. It is a critical component for manufacturers in the coatings, plastics, and printing ink industries seeking vibrant and durable coloration.

Application

• Printing Inks: Widely used in flexographic, gravure, and offset inks for packaging, publications, and decorative prints due to its excellent printability and color consistency.
• Industrial Coatings: Imparts bright red shades in automotive finishes, industrial maintenance paints, and powder coatings, offering good lightfastness and chemical resistance.
• Plastics Coloring: Suitable for coloring a range of polymers, including PVC, polyolefins, and engineering plastics, providing stable coloration during high-temperature processing.
• Textile Printing: Employed in pigment printing pastes for fabrics, delivering vivid prints with good wash and rub fastness.
• Specialty Applications: Used in the coloration of artists' colors, stationery, and other specialty products requiring a clean, bright red pigment.

Basic Information

Product Name	Pigment Red 81
CAS No.	12224-98-5
Molecular Formula	C22H16ClN3O3
Molecular Weight	405.83 g/mol
Synonyms	C.I. Pigment Red 81; C.I. 45160:1; Brilliant Carmine 6B; Lithol Fast Scarlet L 4550; Pigment Scarlet; 2-[[4-[(2-Chloro-4-nitrophenyl)azo]-3-hydroxyphenyl]ethylamino]ethanol; 9-(o-Carboxyphenyl)-6-hydroxy-3-isoxanthenone; Rhodamine 6G Lake
EINECS	235-428-9

Quality Control

Our production of Pigment Red 81 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is tested against key parameters including color strength, hue, particle size distribution, and chemical purity. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each 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 strong oxidizing agents. The container must be kept tightly closed to prevent moisture absorption and contamination.

Specification

Item	Specification
Appearance	Bright Red Powder
Color Strength	100 ± 5% (vs. Standard)
Hue	Conforms to Standard
Purity (HPLC)	≥ 95.0%
Moisture Content	≤ 2.0%
Ash Content	≤ 1.0%
Water Soluble Matter	≤ 1.5%
Particle Size (D50)	0.2 - 0.5 µm
Oil Absorption	40 - 60 g/100g
Lightfastness (1-8)	≥ 5
Heat Resistance	≥ 180°C

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