Description

3-[(5-Chloro-2-Hydroxy-3-Sulfophenyl)Azo]-4-Hydroxy-1-Naphthalenesulfonic Acid Disodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. This compound is valued for its ability to impart vivid and stable color properties in demanding industrial applications. It is primarily sought after by manufacturers in the textile, leather, and specialty ink industries for the synthesis of high-performance dyes and pigments.

Application

• Textile Dyeing: A key intermediate for producing acid dyes and direct dyes used on wool, silk, and nylon fabrics.
• Leather Finishing: Used in the formulation of dyes for coloring leather goods, providing good penetration and color fastness.
• Paper Coloring: Employed in the manufacture of dyes for specialty papers and paper products requiring specific hue and brightness.
• Ink Manufacturing: Serves as a precursor for pigments used in inks for writing, printing, and packaging.
• Biological Staining: Potential use as an intermediate for histological stains in laboratory and diagnostic applications.
• Research & Development: Utilized as a standard or building block in chemical research for synthesizing novel chromophores and functional materials.

Basic Information

Product Name	3-[(5-Chloro-2-Hydroxy-3-Sulfophenyl)Azo]-4-Hydroxy-1-Naphthalenesulfonic Acid Disodium Salt
CAS No.	5858-45-7
Molecular Formula	C16H9ClN2Na2O8S2
Molecular Weight	502.81 g/mol
Synonyms	Acid Red 88; C.I. 15620; Disodium 5-[(5-chloro-2-hydroxy-3-sulfophenyl)azo]-4-hydroxy-1-naphthalenesulfonate; 5-[(5-Chloro-2-hydroxy-3-sulfophenyl)azo]-4-hydroxy-1-naphthalenesulfonic acid disodium salt; Azorubin S; Cl 15620; Food Red 5; Lissamine Red 2G; Wool Fast Red 2G
EINECS	227-500-7

Quality Control

Our production of 3-[(5-Chloro-2-Hydroxy-3-Sulfophenyl)Azo]-4-Hydroxy-1-Naphthalenesulfonic Acid Disodium Salt adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing to ensure consistent purity, color strength, and compliance with relevant industry specifications. A detailed Certificate of Analysis (COA) is provided with each shipment, documenting key parameters such as assay, impurity profile, and solubility.

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 tightly sealed after use to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual ≤ 1.0%, Total ≤ 3.0%

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