Description

C.I. Acid Brown 429 is a synthetic acid dye belonging to the azo chemical class, widely recognized for its specific brown hue and excellent dyeing properties. This product is valued for its strong affinity to protein fibers like wool, silk, and nylon, providing good wash and light fastness. It is primarily utilized by manufacturers in the textile, leather, and paper industries for coloring applications where a durable brown shade is required. The compound is identified by the CAS registry number 134687-47-1.

Application

• Primary dyeing of wool and silk fabrics and yarns.
• Coloration of nylon fibers and polyamide-based textiles.
• Leather dyeing for footwear, apparel, and upholstery.
• Paper staining and tinting for specialty papers.
• Ink formulation for specific printing applications.
• As a colorant for non-food contact polymers and plastics.

Basic Information

Product Name	C.I. Acid Brown 429
CAS No.	134687-47-1
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Acid Brown 429; C.I. 20195; Acid Leather Brown 429; Acid Fast Brown 429; Brown Acid Dye 429; Acid Dye Brown 429; Acidol Brown 429 (Trade Name); Supranol Brown 429 (Trade Name)
EINECS	Contact for details

Quality Control

Our C.I. Acid Brown 429 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent shade, strength, and purity. A detailed Certificate of Analysis (COA) documenting parameters such as color strength, solubility, and impurity profile is provided with each shipment to guarantee it meets your specific application requirements.

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.

Specification

Item	Specification
Appearance	Brown powder or granules
Identification (IR)	Conforms to standard
Color Strength	100% ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Shade	Conforms to standard
Solubility in Water	Conforms

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