Description

Acid Brown 402 is a high-performance, water-soluble acid dye belonging to the azo chemical class, identified by CAS No. 127830-16-4. It is valued for its excellent color fastness, brightness, and strong affinity for protein-based fibers like wool, silk, and nylon. This dye is essential for manufacturers in the textile and leather industries seeking consistent, vibrant brown shades with reliable batch-to-batch quality for their dyeing and printing processes.

Application

• Primary dyeing of wool, silk, and nylon textiles.
• Printing applications on protein fibers and polyamide materials.
• Leather dyeing for footwear, upholstery, and accessories.
• Coloration of specialty papers requiring acid-fast dyes.
• Blending with other acid dyes to achieve custom brown and earth-tone shades.
• Used in the manufacture of dyed feathers and furs.

Basic Information

Product Name	Acid Brown 402
CAS No.	127830-16-4
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Acid Brown 402; C.I. Acid Brown 402; Acid Leather Brown 402; Brown 402; Acid Fast Brown 402; Acid Dye Brown 402; Azo Brown Dye 402; Acid Nylon Brown 402
EINECS	Contact for details

Quality Control

Our Acid Brown 402 is manufactured under a strict quality management system to ensure consistent purity and performance. Each batch is tested against key parameters including color strength, shade, solubility, and fastness properties. A Certificate of Analysis (COA) detailing these results is provided with every shipment to guarantee compliance with your specifications.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed when not in use to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Brown Powder
Identification (IR)	Conforms
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Ash Content	≤ 1.0%
Shade	Conforms to Standard

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