Description

Pigment Red 81 is a high-performance, synthetic organic pigment belonging to the xanthene class, known for its bright and vivid red hue. This pigment is valued for its excellent color strength and good dispersibility, making it a critical component for achieving consistent and durable coloration. It is primarily sought after by manufacturers in the printing, plastics, and coatings industries who require stable and vibrant red shades for their products.

Application

• Primary use in the printing ink industry, especially for packaging and publication gravure inks.
• Coloration of plastics and synthetic resins, including PVC, polyolefins, and engineering plastics.
• Manufacturing of industrial coatings and automotive paints requiring high chroma.
• Pigmentation for textile printing pastes and specialty fibers.
• Used in the production of colored paper and decorative laminates.
• Formulation of artists' colors and pigment preparations for various media.

Basic Information

Product Name	Pigment Red 81
CAS No.	57449-56-6
Molecular Formula	C22H17ClN2O5S
Molecular Weight	480.90 g/mol
Synonyms	C.I. Pigment Red 81; C.I. 45160:1; Pigment Red 81:1; Brilliant Red Toner; Helio Fast Red R; Lithol Fast Scarlet 4450; Permanent Red Toner R; Xanthene Red Pigment; 9-(2-Carboxyphenyl)-3,6-bis(diethylamino)-xanthylium chloride, inner salt
EINECS	260-776-9

Quality Control

Our production of Pigment Red 81 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 purity. Certificates of Analysis (COA) documenting these results are provided with every shipment to support your quality assurance processes.

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.

Specification

Item	Specification
Appearance	Red Powder
Identification (IR)	Conforms
Color Strength	100 ± 5% (vs. Standard)
Hue	Conforms to Standard
Moisture Content	≤ 2.0%
Residue on Sieve (45μm)	≤ 5.0%
Oil Absorption	40 - 60 g/100g
Lightfastness	≥ 5 (Scale 1-8)
Heat Resistance	≥ 180°C

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