Description

Benzenesulfonic Acid, 5-[[2,4-Dihydroxy-5-[(4-Sulfophenyl) Azo]Phenyl]Azo]-2,4-Dimethyl-, Disodium Salt is a high-purity, water-soluble azo dye intermediate characterized by its disulfonated structure. This compound matters for its role as a critical precursor in synthesizing vibrant, lightfast, and washfast dyes and pigments for demanding industrial applications. It is primarily needed by manufacturers in the textile, leather, ink, and specialty chemical industries seeking to produce high-performance colorants.

Application

• Textile Dyeing: A key intermediate for producing acid dyes and direct dyes for coloring nylon, wool, silk, and paper.
• Leather Coloring: Used in the formulation of dyes for imparting deep, uniform colors to leather goods.
• Ink Manufacturing: Serves as a precursor for pigments used in printing inks, requiring good solubility and color strength.
• Specialty Pigments: Employed in the synthesis of pigments for plastics, coatings, and other polymeric materials.
• Biological Staining: Potential use as an intermediate for histochemical stains and indicators in laboratory settings.
• Research & Development: Used as a standard or building block in organic synthesis and color chemistry research.

Basic Information

Item	Details
Product Name	Benzenesulfonic Acid, 5-[[2,4-Dihydroxy-5-[(4-Sulfophenyl) Azo]Phenyl]Azo]-2,4-Dimethyl-, Disodium Salt
CAS No.	72749-81-6
Molecular Formula	C20H14N4Na2O9S2
Molecular Weight	556.45 g/mol
Synonyms	Acid Black 210; C.I. 300310; Disodium 5-[[2,4-dihydroxy-5-[(4-sulfophenyl)azo]phenyl]azo]-2,4-dimethylbenzenesulfonate; 2,4-Dimethyl-5-[[2,4-dihydroxy-5-[(4-sulfophenyl)azo]phenyl]azo]benzenesulfonic acid disodium salt; Azo dye intermediate 72749-81-6; Benzenesulfonic acid, 5-((2,4-dihydroxy-5-((4-sulfophenyl)azo)phenyl)azo)-2,4-dimethyl-, disodium salt
EINECS	Contact for details

Quality Control

Our Benzenesulfonic Acid, 5-[[2,4-Dihydroxy-5-[(4-Sulfophenyl) Azo]Phenyl]Azo]-2,4-Dimethyl-, Disodium Salt is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure consistent purity, color value, and chemical identity. Certificates of Analysis (COA) detailing key parameters such as assay, impurity profile, and solubility are available upon request to support your quality assurance protocols.

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 to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark brown to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Solubility (in Water)	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
pH (1% Solution)	6.0 - 8.0

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