Description

C.I. Acid Red 343 is a synthetic, water-soluble azo dye belonging to the acid dye class, widely recognized for its vibrant red color and good fastness properties. This compound is valued for its ability to form strong ionic bonds with polyamide and protein fibers, ensuring excellent wash and light fastness in demanding applications. It is primarily utilized by manufacturers in the textile, leather, and paper industries for dyeing and printing, where consistent color strength and batch-to-batch uniformity are critical for quality assurance.

Application

• Dyeing of nylon and polyamide fibers for apparel, automotive textiles, and carpets.
• Coloration of wool, silk, and other protein-based natural fibers.
• Printing inks for paper and specialty packaging materials.
• Leather finishing and dyeing for footwear, upholstery, and accessories.
• As a colorant for anodized aluminum in architectural and decorative applications.
• Potential use in biological staining and as a colorimetric pH indicator in research settings.

Basic Information

Product Name	C.I. Acid Red 343
CAS No.	61847-61-8
Molecular Formula	C32H21N5Na2O8S2
Molecular Weight	713.65 g/mol
Synonyms	Acid Red 343; Acid Leather Red 2GL; Acid Leather Red GL; C.I. 17200; Nylosan Red F-2GL; Telon Red F-2GL; Acid Red GL; Acid Leather Red GL; 2-Naphthalenesulfonic acid, 7-[[4-[[(2,4-dimethylphenyl)amino]carbonyl]phenyl]azo]-4-hydroxy-3-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-, disodium salt
EINECS	Contact for details

Quality Control

Our production of C.I. Acid Red 343 adheres to stringent quality management protocols to ensure high purity, consistent color strength, and compliance with relevant industry standards. Each batch is tested for critical parameters including dye content, shade, solubility, and fastness properties. Certificates of Analysis (COA) detailing these specifications are available upon request to support your quality assurance and regulatory needs.

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. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product stability.

Specification

Item	Specification
Appearance	Red to dark red powder
Identification (IR)	Conforms to standard
Assay (Dye Content)	≥ 95%
Moisture Content	≤ 5.0%
Water Solubility	Clear solution at 1%
pH (1% Solution)	6.0 - 8.0
Shade & Strength	Within agreed commercial tolerance vs. standard
Fastness Properties (Light, Wash)	Contact for details

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