Description

C.I. Acid Red 357 is a high-performance synthetic dye belonging to the azo chemical class, valued for its vibrant red color and strong affinity for protein-based fibers. Its primary commercial value lies in providing consistent, high-quality coloration with excellent fastness properties in demanding industrial applications. This dye is essential for manufacturers in the textile, leather, and specialty paper industries seeking reliable and efficient coloring agents.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers, providing excellent wash and light fastness.
• Leather Finishing: Used for coloring leather goods, including footwear, garments, and upholstery, offering deep, uniform shades.
• Paper Coloration: Employed in the production of specialty papers, decorative papers, and security paper requiring specific red hues.
• Ink Manufacturing: A key component in formulating inks for various printing applications, including inkjet and packaging inks.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Plastics and Polymers: Used for coloring certain types of plastics and synthetic materials where acid dye compatibility is required.

Basic Information

Product Name	C.I. Acid Red 357
CAS No.	61951-36-8
Molecular Formula	C32H21N7Na2O8S2
Molecular Weight	749.66 g/mol
Synonyms	Acid Red 357; C.I. 18763; Acid Leather Red G; Nylosan Red F-3GL; Telon Red F3GL; Acid Fast Red A; 2,7-Naphthalenedisulfonic acid, 5-[[4-chloro-2-[(2-hydroxy-1-naphthalenyl)azo]-5-sulfophenyl]azo]-4-hydroxy-3-[(4-methoxyphenyl)azo]-, disodium salt; 5-[[4-Chloro-2-[(2-hydroxy-1-naphthyl)azo]-5-sulfophenyl]azo]-4-hydroxy-3-[(4-methoxyphenyl)azo]-2,7-naphthalenedisulfonic Acid Disodium Salt
EINECS	Contact for details

Quality Control

Our production of C.I. Acid Red 357 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance. Each lot is tested against key parameters including color strength, shade, solubility, and impurity profile to meet precise customer specifications. Certificates of Analysis (COA) documenting purity, physical properties, and performance characteristics are available for 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can affect product performance and handling.

Specification

Item	Specification
Appearance	Red to Dark Red Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (vs. Standard)
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Ash Content	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm

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