Description

C.I. Acid Brown 268 is a synthetic acid dye belonging to the azo chemical class, valued for its specific brown hue and strong affinity for protein-based fibers like wool, silk, and nylon. This dye is engineered to deliver excellent color fastness properties, including good lightfastness and washfastness, making it a reliable choice for demanding coloration processes. It is primarily utilized by manufacturers in the textile, leather, and paper industries seeking consistent, high-quality brown shades for their products.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers and fabrics to achieve durable brown shades.
• Leather Finishing: Used in the coloration of leather goods, providing rich and even brown tones with good penetration.
• Paper Staining: Employed for tinting specialty papers, including decorative and packaging materials.
• Ink Formulation: A colorant component in the manufacture of certain inks for industrial or specialty printing.
• Biomaterial Staining: Potential use in laboratory settings for histological staining of biological tissues.

Basic Information

Product Name	C.I. Acid Brown 268
CAS No.	72827-69-1
Molecular Formula	C32H24N12Na4O16S4
Molecular Weight	1088.88 g/mol
Synonyms	Acid Brown 268; Acid Leather Brown D; C.I. 34932; Acid Brown D-2R; Leather Brown D; Acid Brown DR; Brown 268 (Acid Dye); 2-Naphthalenesulfonic acid, 7-[[4-[[2,4-diamino-5-[(4-sulfophenyl)azo]phenyl]azo]-1-naphthalenyl]azo]-3-[[4-[[2,4-diamino-5-[(4-sulfophenyl)azo]phenyl]azo]-1-naphthalenyl]azo]-, tetrasodium salt
EINECS	Contact for details

Quality Control

Our production of C.I. Acid Brown 268 adheres to stringent quality control 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 industry specifications. A comprehensive Certificate of Analysis (COA) detailing all test results 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 strong oxidizing agents.

Specification

Item	Specification
Appearance	Brown powder
Identification (IR)	Conforms
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 50 ppm
Shade	Conforms to Standard

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