Description

Acid Red 73 is a synthetic azo dye belonging to the acid dye class, valued for its bright red color and good affinity for protein-based fibers. Its primary commercial importance lies in its ability to provide vibrant, wash-fast coloration to textiles like wool, silk, and nylon. This dye is essential for manufacturers in the textile, leather, and paper industries seeking reliable and consistent red shades for their products.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and polyamide (nylon) fibers.
• Leather Coloring: Used to impart red shades to leather goods.
• Paper Staining: Employed in the production of colored papers and paper products.
• Ink Formulation: A colorant component for certain types of inks.
• Biological Staining: Potential use as a histological stain in laboratory settings.
• Specialty Coatings: Used in some coatings and surface treatments requiring a red hue.

Basic Information

Product Name	Acid Red 73
CAS No.	5413-75-2
Molecular Formula	C22H14N4Na2O7S2
Molecular Weight	556.48 g/mol
Synonyms	Acid Red 73; C.I. 27290; Acid Scarlet 3R; Acid Fast Red A; Acid Leather Red A; Naphthalene Scarlet 4R; Lissamine Scarlet V; Acid Leather Red 3R; 2,7-Naphthalenedisulfonic acid, 4-hydroxy-3-[(2-methoxyphenyl)azo]-, disodium salt
EINECS	226-540-3

Quality Control

Our Acid Red 73 is manufactured under a strict quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against key parameters including color strength, shade, solubility, and impurity profile. A Certificate of Analysis (COA) detailing 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 and sources of ignition.

Specification

Item	Specification
Appearance	Red to dark red powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 85%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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