Description

Acid Red 337 is a synthetic monoazo acid dye known for its bright and vivid red color. This high-performance dye is valued for its excellent tinctorial strength, good lightfastness, and strong affinity for protein-based and polyamide fibers. It is primarily used by manufacturers in the textile, leather, and paper industries seeking durable and vibrant coloration. Acid Red 337 CAS NO 39280-63-2 is a key component for producing a range of red shades in various dyeing and printing applications.

Application

• Primary dyeing and printing of wool, silk, and nylon textiles.
• Coloration of leather goods, including footwear, garments, and upholstery.
• Manufacture of paper products requiring colored coatings or mass coloration.
• Ink formulation for specialized inks and toners.
• Dyeing of feathers and other natural protein materials.
• As a colorant for certain types of anodized aluminum.
• Research and development applications in analytical chemistry as a staining agent.

Basic Information

Product Name	Acid Red 337
CAS No.	39280-63-2
Molecular Formula	C22H14N4Na2O7S2
Molecular Weight	556.48 g/mol
Synonyms	Acid Red 337; C.I. Acid Red 337; 2,7-Naphthalenedisulfonic acid, 4-hydroxy-3-[(2-methoxy-5-methyl-4-sulfophenyl)azo]-, disodium salt; Acid Leather Red G; Nylosan Red F-3GL; Telon Red F3G; Supranol Red GW; Lanasyn Red S-2GL; Acid Fast Red E-3GL
EINECS	254-418-6

Quality Control

Our Acid Red 337 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. The product undergoes comprehensive testing, including spectrophotometric analysis for color strength and shade, and purity assessment via HPLC. A Certificate of Analysis (COA) detailing specific test results is provided with every shipment to guarantee compliance with your technical requirements.

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
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
Dye Content (HPLC)	≥ 85.0%
pH (1% Solution)	6.0 - 8.0

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