Description

4-[(5-Chloro-4-Methyl-2-Sulphophenyl)Azo]-3-Hydroxynaphthalene-2,7-Disulphonic Acid, Calcium Salt is a high-purity, water-soluble azo dye intermediate essential for producing vivid and stable colorants. Its primary value lies in its ability to impart bright, lightfast shades, particularly in the red to violet spectrum, when incorporated into final dye formulations. This compound is a critical raw material for manufacturers in the textile, ink, and specialty coatings industries seeking consistent batch-to-batch performance.

Application

• Primary intermediate for the synthesis of acid dyes and direct dyes used in textile printing and dyeing of nylon, wool, and silk.
• Key component in the production of pigments and lake colors for inks, including packaging and security inks.
• Used in the formulation of specialty colorants for paper coatings and decorative papers.
• Intermediate for functional dyes with potential applications in biological staining and analytical chemistry.
• Raw material for colorants used in the leather tanning and finishing industry.
• Starting point for developing customized dye molecules for research and high-value niche applications.

Basic Information

Item	Details
Product Name	4-[(5-Chloro-4-Methyl-2-Sulphophenyl)Azo]-3-Hydroxynaphthalene-2,7-Disulphonic Acid, Calcium Salt
CAS No.	84696-60-6
Molecular Formula	C17H9CaClN2O10S3 (or related hydrate forms)
Molecular Weight	Contact for details
Synonyms	Calcium 4-[(5-chloro-4-methyl-2-sulfophenyl)azo]-3-hydroxy-2,7-naphthalenedisulfonate; C.I. Acid Red (related shades); 5-Chloro-4-methyl-2-[(3-hydroxy-2,7-disulfo-1-naphthalenyl)azo]benzenesulfonic acid, calcium salt; Azo dye intermediate 84696-60-6; Calcium salt of hydroxynaphthalene disulfonic acid azo dye; Red 3B Lake intermediate (generic); Benzenesulfonic acid, 5-chloro-4-methyl-2-[(3-hydroxy-2,7-disulfo-1-naphthalenyl)azo]-, calcium salt
EINECS	Contact for details

Quality Control

Our production of this azo dye intermediate adheres to strict quality management systems to ensure purity and consistency for downstream synthesis. Every batch is analyzed using advanced techniques like HPLC and spectrophotometry to confirm critical parameters such as assay, hue strength, and impurity profile. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and physical specifications is provided with each shipment 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 ambient temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect product performance and handling.

Specification

Item	Specification
Appearance	Dark red to violet powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	Max. 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.