Description

C.I.Acid Red 337 is a synthetic, water-soluble azo dye belonging to the acid dye class, valued for its bright and durable red coloration. It is a critical component for industries requiring high-quality, consistent, and wash-fast coloring of protein-based and polyamide materials. This product is essential for manufacturers in the textile, leather, and paper industries seeking reliable and vibrant dyeing solutions.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers to achieve brilliant red shades with good light and wash fastness.
• Leather Finishing: Used in the coloration of leather goods, providing uniform and penetrating color for products like upholstery, garments, and accessories.
• Paper Staining: Employed in the production of specialty papers, including decorative papers and security papers, where color consistency is paramount.
• Ink Formulation: A component in the manufacture of inks for various marking and printing applications.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Polyamide Plastics: Can be used for coloring certain types of polyamide (nylon) plastics.

Basic Information

Product Name	C.I.Acid Red 337
CAS No.	12270-02-9
Molecular Formula	C32H21N5Na2O8S2
Molecular Weight	729.64 g/mol
Synonyms	Acid Red 337; C.I. 17030; Acid Leather Red G; Nylosan Red F-3GL; Telon Red F3GL; Erionyl Red 3G-FS; Supranol Red 3GW; Acid Fast Red E-3GL
EINECS	235-543-6

Quality Control

Our C.I.Acid Red 337 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against rigorous internal specifications for critical parameters including color strength, shade, solubility, and impurity profile. Certificates of Analysis (COA) detailing these results are available upon request to support your quality assurance protocols.

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.

Specification

Item	Specification
Appearance	Red to dark red powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Color Strength	100 ± 3%
Moisture Content	Max. 5.0%
Water Solubility	Conforms
pH (1% Solution)	6.0 - 8.0
Ash Content	Max. 1.0%

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