Description

C.I. Acid Brown 235 is a synthetic azo dye belonging to the acid dye class, valued for its specific brown hue and affinity for protein-based fibers like wool, silk, and nylon. Its primary commercial value lies in providing consistent, high-tinctorial strength coloration with good leveling properties and wash fastness in demanding industrial dyeing processes. This product is essential for manufacturers in the textile, leather, and specialty paper industries seeking reliable and reproducible brown shades.

Application

• Primary dyeing and printing of wool and silk fabrics and yarns.
• Coloration of nylon fibers for carpets, apparel, and technical textiles.
• Leather dyeing for upholstery, footwear, and fashion accessories.
• Staining and coloring of specialty papers and packaging materials.
• As a colorant in the manufacture of inks and coatings.
• Used in biological staining applications for microscopy (specific grades).

Basic Information

Product Name	C.I. Acid Brown 235
CAS No.	12217-26-4
Molecular Formula	C32H24N8Na2O8S2
Molecular Weight	774.75 g/mol
Synonyms	Acid Brown 235; Acid Brown A-GRL; C.I. 30035; Acid Leather Brown GRL; Nylosan Brown E-RL; Telon Brown A-GRL; Acid Fast Brown GRL; Aminyl Brown E-RL
EINECS	Contact for details

Quality Control

Our C.I. Acid Brown 235 is manufactured under a strict quality management system. Every batch undergoes comprehensive testing for key parameters including color strength, shade, solubility, and impurity profile to ensure batch-to-batch consistency and compliance with industry standards. Certificates of Analysis (COA) detailing these results are available upon request.

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	Brown powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Ash Content	≤ 1.0%
Heavy Metals (as Pb)	≤ 50 ppm

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