Description

Calcium Hydrogen 3-Hydroxy-4-[(4-Methyl-2-Sulphonatophenyl)Azo]Naphthalene-2,7-Disulphonate is a high-purity, water-soluble azo dye complex valued for its vibrant color and excellent stability. This compound is engineered to deliver consistent performance and batch-to-batch reliability for demanding industrial applications. It is primarily utilized by manufacturers in the textile, paper, and specialty ink industries seeking a robust and effective coloring agent.

Application

• Textile Dyeing: As a key colorant for dyeing cotton, wool, silk, and nylon fibers, providing good wash and light fastness.
• Paper Coloring: Used in the production of colored papers, boards, and specialty packaging materials.
• Ink Formulation: A critical component in the manufacture of inks for writing, printing, and stamping applications.
• Leather Finishing: Employed in dyeing processes for leather goods to achieve uniform and durable coloration.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Industrial Pigments: Can be processed into lakes or used as an intermediate for producing other pigment forms.

Basic Information

Product Name	Calcium Hydrogen 3-Hydroxy-4-[(4-Methyl-2-Sulphonatophenyl)Azo]Naphthalene-2,7-Disulphonate
CAS No.	79953-84-7
Molecular Formula	C17H11CaN2O10S3 (or related salt form)
Molecular Weight	Contact for details
Synonyms	Acid Red 337 (Calcium Salt); C.I. 17210; Calcium 3-Hydroxy-4-[(4-methyl-2-sulfophenyl)azo]-2,7-naphthalenedisulfonate; 3-Hydroxy-4-[(4-methyl-2-sulfophenyl)azo]-2,7-naphthalenedisulfonic Acid Calcium Salt; Azo Rubine; Acid Leather Red 2B; Acid Leather Red BG
EINECS	Contact for details

Quality Control

Our production of Calcium Hydrogen 3-Hydroxy-4-[(4-Methyl-2-Sulphonatophenyl)Azo]Naphthalene-2,7-Disulphonate adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for color strength, purity, and solubility. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with each shipment to guarantee compliance and traceability.

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, which can affect product performance.

Specification

Item	Specification
Appearance	Reddish-brown to dark red powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Loss on Drying	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.