Description

Acid Brown 349 is a synthetic acid dye belonging to the azo dye class, known for its excellent affinity for protein fibers like wool, silk, and nylon. This dye offers superior color fastness properties, including good lightfastness and washfastness, making it a reliable choice for demanding textile applications. It is primarily used by manufacturers in the textile and leather industries for dyeing and printing, providing consistent and vibrant brown shades.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers to achieve durable brown hues.
• Leather Coloring: Used in the dyeing of leather goods, providing rich and uniform color penetration.
• Paper Staining: Employed for specialty paper products requiring specific color tones.
• Ink Formulation: A component in the manufacture of inks for various industrial printing applications.
• Biomaterial Staining: Potential use in laboratory settings for staining biological materials in microscopy.

Basic Information

Product Name	Acid Brown 349
CAS No.	72827-73-7
Molecular Formula	C32H20N8Na4O14S4
Molecular Weight	1010.86 g/mol
Synonyms	Acid Leather Brown P-2R; C.I. Acid Brown 349; Acid Brown 349 (C.I. 34900); 2,7-Naphthalenedisulfonic acid, 5-[[4-[[2-(aminosulfonyl)-4-nitrophenyl]azo]-1-naphthalenyl]azo]-3-[[4-[[2-(aminosulfonyl)-4-nitrophenyl]azo]-1-naphthalenyl]azo]-4-hydroxy-, tetrasodium salt; Tetrasodium 5,3-bis[[4-[(2-sulfamoyl-4-nitrophenyl)azo]naphthalen-1-yl]azo]-4-hydroxynaphthalene-2,7-disulfonate
EINECS	Contact for details

Quality Control

Our Acid Brown 349 is manufactured under a stringent quality management system. Each batch undergoes comprehensive analytical testing, including spectrophotometric analysis for strength and shade, to ensure it meets precise coloristic and chemical specifications. Certificates of Analysis (COA) detailing purity, dye content, and impurity profiles are provided with every shipment to guarantee batch-to-batch consistency and performance reliability for your production processes.

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 nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product performance. Keep away from incompatible materials.

Specification

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

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