Description

Acid Brown 440 is a synthetic organic dye belonging to the acid dye class, characterized by its brown hue and good affinity for protein-based fibers. This product is valued for its ability to provide consistent, level dyeing with good wash and light fastness properties on substrates like wool, silk, and nylon. It is a critical component for manufacturers in the textile, leather, and paper industries seeking reliable and vibrant coloration.

Application

• Primary dyeing of wool, silk, and nylon textiles and yarns.
• Coloration of leather goods, including footwear, apparel, and accessories.
• Dyeing of specialty paper products and packaging materials.
• Used in the formulation of inks for various printing applications.
• Potential use as a biological stain in laboratory and microscopy settings.
• Coloration of food casings and other non-food contact applications where colorfastness is required.

Basic Information

Product Name	Acid Brown 440
CAS No.	93376-15-9
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Acid Brown 440; C.I. Acid Brown 440; Acid Leather Brown 440; Brown 440; Acid Dye Brown 440; Acid Fast Brown 440; Leather Brown 440; DyStar® Acid Brown 440 (Trade Name)
EINECS	Contact for details

Quality Control

Our Acid Brown 440 is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets defined specifications for strength, shade, and purity. Certificates of Analysis (COA) documenting key parameters are available upon request to support your quality assurance and regulatory compliance needs.

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 or granules
Identification (IR)	Conforms to standard
Assay (Color Strength)	≥ 98%
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Shade	Conforms to standard
Fastness Properties	To be specified per grade

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