Description

Sulfur Brown 37 is a synthetic organic dye belonging to the sulfur dye class, widely recognized for its excellent colorfastness properties. This high-performance dye is engineered to deliver deep, rich brown shades with superior wash and light fastness, making it a critical component for durable coloration. It is primarily utilized by the textile industry for dyeing cellulosic fibers like cotton, viscose, and linen, as well as in applications requiring robust and economical color solutions.

Application

• Textile Dyeing: Primary application for dyeing cotton, linen, hemp, and other cellulosic fibers to achieve durable brown shades.
• Denim Production: Used in the coloration of denim fabrics, contributing to classic and fashion-oriented brown tones.
• Yarn Dyeing: Suitable for batch and continuous dyeing processes of yarns intended for weaving and knitting.
• Fabric Printing: Employed in pigment printing pastes for textile printing applications.
• Leather Coloring: Application in dyeing leather goods where deep, fast colors are required.
• Paper Staining: Used for tinting specialty papers and paper products.

Basic Information

Product Name	Sulfur Brown 37
CAS No.	61951-90-4
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	C.I. Sulfur Brown 37; Sulfur Brown G; Sulfur Brown GD; C.I. 53015; D&C Brown No. 1; Leather Brown G; Kayaku Sulphur Brown G; Sulphur Brown G; Mitsui Sulphur Brown G
EINECS	Contact for details

Quality Control

Our Sulfur Brown 37 is manufactured under a strict quality management system to ensure batch-to-batch consistency and performance reliability. Quality parameters including shade, strength, solubility, and fastness properties are rigorously tested against established standards. A Certificate of Analysis (COA) detailing all relevant specifications is provided with each 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 away from incompatible materials. Maintain storage temperature between 15-25°C. Keep container tightly sealed when not in use to prevent moisture absorption and contamination.

Specification

Item	Specification
Appearance	Brown to Dark Brown Powder/Granules
Shade	Conforms to Standard
Strength	100% ± 3%
Moisture Content	≤ 5.0%
Water Solubility	Conforms to Standard
Particle Size (Through 80 mesh)	≥ 95%
Fastness to Washing	≥ 4 (Grey Scale)
Fastness to Light	≥ 4-5 (Blue Wool Scale)

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