Description

Disodium 2-[(2-Hydroxynaphthyl)Azo]Naphthalene-1,5-Disulphonate is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its primary value lies in its role as a key precursor for synthesizing vibrant and stable acid dyes and pigments, particularly for polyamide fibers like nylon and wool. This compound is essential for manufacturers in the textile, leather, and specialty ink industries seeking to produce high-quality, colorfast products. The CAS number for this compound is 59970-88-6.

Application

• Primary Intermediate for Acid Dyes: Serves as the crucial building block for manufacturing a wide range of acid dyes used on nylon, wool, and silk textiles.
• Leather Dyeing: Used in the formulation of dyes for coloring leather goods, providing good penetration and fastness.
• Ink & Toner Production: Employed in the synthesis of pigments for specialty inks, including inks for packaging and security applications.
• Paper Coloring: Finds application in the production of dyes for coloring paper products where specific shade and stability are required.
• Research & Development: Utilized in chemical R&D laboratories for developing new dye molecules and studying azo coupling reactions.
• Biological Staining (Histology): Certain derivatives may be explored for use as biological stains in microscopy, though this is a more specialized application.

Basic Information

Item	Details
Product Name	Disodium 2-[(2-Hydroxynaphthyl)Azo]Naphthalene-1,5-Disulphonate
CAS No.	59970-88-6
Molecular Formula	C20H12N2Na2O8S2
Molecular Weight	534.42 g/mol
Synonyms	Acid Red 337 (C.I. 17200); Disodium 6-hydroxy-5-[(2-hydroxy-1-naphthyl)azo]naphthalene-1,5-disulfonate; 1,5-Naphthalenedisulfonic acid, 2-[(2-hydroxy-1-naphthalenyl)azo]-, disodium salt; Naphthalene-1,5-disulfonic acid, 2-[(2-hydroxynaphthyl)azo]-, disodium salt; C.I. Acid Red 337; Azo Rubine S; Azo Rubine; Acid Leather Red S-GR
EINECS	261-983-5

Quality Control

Our production of Disodium 2-[(2-Hydroxynaphthyl)Azo]Naphthalene-1,5-Disulphonate adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and spectrophotometry for color strength, to ensure consistency and performance. A detailed Certificate of Analysis (COA) documenting purity, assay, and impurity profiles is provided with each shipment to guarantee traceability and compliance with your specifications.

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). Keep away from strong oxidizing agents and incompatible materials. The product is light-sensitive (store away from light) and hygroscopic (moisture-sensitive); prolonged exposure to air and humidity should be avoided to maintain stability.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Water Content	Max. 5.0%
Sulfated Ash	Max. 30.0%
Heavy Metals (as Pb)	Max. 20 ppm
Solubility (in Water)	Clear, complete solution

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