Description

Acid Red 257 is a synthetic monoazo acid dye known for its bright and vivid red color. It is valued for its strong tinctorial strength, good solubility, and excellent fastness properties, particularly in demanding applications. This dye is primarily used by manufacturers in the textile, leather, and paper industries for coloring polyamide, wool, and silk fibers, as well as for specialty ink formulations.

Application

• Textile Dyeing: Primary application for dyeing nylon (polyamide), wool, and silk fibers to achieve bright red shades with good wash and light fastness.
• Leather Finishing: Used in the coloration of leather goods, providing rich, uniform color penetration.
• Paper Coloring: Employed in the production of specialty papers, including decorative and packaging materials.
• Ink Manufacturing: A key component in formulating inks for ballpoint pens, stamp pads, and other writing instruments.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Plastics and Polymers: Can be used for coloring certain types of plastics and synthetic materials.

Basic Information

Product Name	Acid Red 257
CAS No.	12217-36-6
Molecular Formula	C22H14N4Na2O7S2
Molecular Weight	556.48 g/mol
Synonyms	Acid Red 257; C.I. Acid Red 257; Acid Leather Red G; Nylosan Red F-3GL; Telon Red F3GL; Acid Fast Red A; Acid Brilliant Red 3G; 7-Benzamido-4-hydroxy-3-[[4-[(2-sulfooxyethyl)sulfonyl]phenyl]azo]-2-naphthalenesulfonic Acid Disodium Salt
EINECS	Contact for details

Quality Control

Our Acid Red 257 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure consistency in strength, shade, and purity. We provide a Certificate of Analysis (COA) with key parameters including assay, shade, solubility, and fastness properties. Our quality protocols are designed to meet the specifications required by the textile and leather industries.

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%
Moisture Content	Max. 5.0%
Water Solubility	Conforms
Shade & Strength	Within ± 5% of standard
Fastness Properties	To be specified per grade

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