Description

C.I. Acid Brown 37 is a synthetic azo dye belonging to the acid dye class, valued for its ability to impart a durable brown color to protein-based fibers like wool, silk, and nylon. Its primary commercial significance lies in its excellent wash and light fastness properties, ensuring color integrity in finished textile products. This dye is essential for manufacturers in the textile, leather, and specialty paper industries seeking consistent and vibrant brown shades.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers and fabrics.
• Leather Coloring: Used for dyeing leather goods, providing rich brown tones.
• Paper Staining: Employed in the production of specialty colored papers and packaging.
• Ink Formulation: A component in the manufacture of certain inks for industrial marking.
• Biological Staining: Potential use as a histological stain in laboratory settings.
• Wood Staining: Applied for coloring wood and wood-based products.

Basic Information

Product Name	C.I. Acid Brown 37
CAS No.	61724-05-8
Molecular Formula	C22H14N6Na2O9S2
Molecular Weight	624.49 g/mol
Synonyms	Acid Brown 37; Acid Leather Brown 2GL; Acidol Brown M-BRL; Amido Brown BRL; Airedale Brown BRL; Atul Acid Brown BRL; C.I. 17580; Acid Fast Brown BRL; Dermacid Brown BRL; Nylosan Brown E-BRL; Sandolan Brown E-BRL; Supranol Brown BRL; Telon Brown BRL
EINECS	262-967-7

Quality Control

Our production of C.I. Acid Brown 37 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 the demanding standards of the textile and leather industries. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and conformance to specification is provided with 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). Keep away from incompatible materials and sources of ignition. The product is light-sensitive and should be stored away from direct light exposure to maintain stability.

Specification

Item	Specification
Appearance	Brown powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Solubility in Water	Conforms
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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