Description

Acid Red 13 is a synthetic, water-soluble azo dye belonging to the acid dye class, valued for its bright red color and good affinity for protein-based fibers. Its primary commercial value lies in providing vibrant, durable coloration to textiles like wool, silk, and nylon, as well as in specialized applications such as leather finishing and paper staining. This dye is essential for manufacturers in the textile, leather, and specialty paper industries seeking consistent, high-quality red shades. The compound is supplied as a high-purity powder, ensuring reliable performance in demanding industrial dyeing processes.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers to achieve bright red shades.
• Leather Finishing: Used for coloring leather goods, providing rich and uniform coloration.
• Paper Staining: Employed in the production of specialty papers, including decorative and colored papers.
• Ink Formulation: A colorant component in the manufacture of certain inks for non-food contact applications.
• Biological Staining (Histology): Used in some laboratory settings as a biological stain for microscopic analysis.
• Cosmetics (Restricted): May be used as a color additive in non-permanent cosmetic products, subject to regional regulatory approval.

Basic Information

Item	Details
Product Name	Acid Red 13
CAS No.	2302-96-7
Molecular Formula	C20H12N2Na2O7S2
Molecular Weight	502.42 g/mol
Synonyms	Acid Red 13; C.I. 16045; Food Red 10; Wool Red B; Naphthalene Scarlet 4R; Azo Rubine S; Acid Rubine; 7-Hydroxy-8-[(E)-(4-sulfonato-1-naphthyl)diazenyl]-1,3-naphthalenedisulfonic acid disodium salt
EINECS	218-964-6

Quality Control

Our Acid Red 13 is manufactured under a strict quality management system to ensure batch-to-batch consistency and high purity. Each lot is tested against stringent in-house specifications, which typically include parameters for color strength, shade, solubility, and impurity profiles. A Certificate of Analysis (COA) detailing these results is provided with every shipment. While not typically classified as a pharmaceutical grade, production can adhere to GMP principles upon request for specific industrial applications.

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), and prolonged exposure to direct light should be avoided to prevent degradation of the colorant.

Specification

Item	Specification
Appearance	Red to dark red powder
Identification (IR)	Conforms to standard
Assay (Color Strength)	≥ 95%
Moisture Content	≤ 5.0%
Water Solubility	Clear solution
Ash Content	≤ 30.0%
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.