Description

Acid Red 131 is a synthetic anionic dye belonging to the azo chemical class, valued for its bright and durable red color. It is a critical component for achieving consistent, high-quality coloration in demanding industrial applications. This dye is primarily utilized by manufacturers in the textile, leather, and paper industries seeking reliable and cost-effective red shades.

Application

• Textile Dyeing: Used for dyeing nylon, silk, wool, and modified acrylic fibers, providing good wash and light fastness.
• Leather Finishing: Imparts vibrant red colors to leather goods, including footwear, apparel, and upholstery.
• Paper Coloring: Employed in the surface coloring and coating of specialty papers and paper products.
• Ink Formulation: Serves as a colorant for inks used in packaging, printing, and marking applications.
• Biological Staining: May be used as a histological stain in laboratory settings for microscopic analysis.
• Plastics and Polymers: Can be incorporated for coloring certain types of plastics and synthetic materials.

Basic Information

Product Name	Acid Red 131
CAS No.	12234-99-0
Molecular Formula	C22H14N4Na2O7S2
Molecular Weight	556.48 g/mol
Synonyms	Acid Red 131; C.I. Acid Red 131; Acid Leather Red D; Acid Leather Red D (VAN); Acid Leather Red D (C.I. 24860); 2,7-Naphthalenedisulfonic acid, 4-hydroxy-3-[(2-methoxyphenyl)azo]-, disodium salt; Disodium 4-hydroxy-3-[(2-methoxyphenyl)azo]naphthalene-2,7-disulphonate
EINECS	Contact for details

Quality Control

Our Acid Red 131 is manufactured under a stringent 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 comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and conformance to specification is provided with every shipment.

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 product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Red to dark red powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Color Strength	100 ± 3%
Shade	Conforms to standard
Moisture Content	Max. 5.0%
Water Solubility	Conforms
Ash Content	Max. 1.0%

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