Description

Sodium 3-[(1,5-Dihydroxy-2-Naphthyl)Azo]-4-Hydroxy-5-Nitrobenzenesulphonate is a synthetic azo dye intermediate of significant commercial importance. Its value lies in its role as a key precursor for producing high-performance dyes and pigments, particularly those requiring specific shades and fastness properties. This compound is essential for manufacturers in the textile, leather, and specialty ink industries seeking to develop vibrant and durable colorants.

Application

• Primary intermediate in the synthesis of azo dyes and pigments for textiles and fabrics.
• Key component in the production of leather dyes, providing deep, stable coloration.
• Used in the formulation of specialty inks, including those for packaging and security printing.
• Precursor for paper colorants and coatings.
• Potential use in the research and development of functional dyes for non-textile applications.
• Employed in analytical chemistry as a chromogenic reagent or standard.

Basic Information

Product Name	Sodium 3-[(1,5-Dihydroxy-2-Naphthyl)Azo]-4-Hydroxy-5-Nitrobenzenesulphonate
CAS No.	5979-27-1
Molecular Formula	C17H10N3NaO8S
Molecular Weight	439.33 g/mol
Synonyms	Acid Black 52; C.I. 15711; 3-[(1,5-Dihydroxy-2-naphthyl)azo]-4-hydroxy-5-nitrobenzenesulfonic acid sodium salt; Sodium 4-hydroxy-3-[(1,5-dihydroxy-2-naphthyl)azo]-5-nitrobenzenesulfonate; Benzenesulfonic acid, 3-[(1,5-dihydroxy-2-naphthalenyl)azo]-4-hydroxy-5-nitro-, monosodium salt; 1-Naphthol-3,7-disulfonic acid azo derivative sodium salt (related); Azo dye intermediate for Acid Black 52
EINECS	227-795-2

Quality Control

Our Sodium 3-[(1,5-Dihydroxy-2-Naphthyl)Azo]-4-Hydroxy-5-Nitrobenzenesulphonate is produced under a rigorous quality management system to ensure batch-to-batch consistency and purity. Each lot is analyzed to confirm identity, strength, and the absence of critical impurities. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials and sources of ignition. The product is light-sensitive; prolonged exposure to light should be avoided to maintain stability.

Specification

Item	Specification
Appearance	Dark brown to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Loss on Drying	Max. 2.0%
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	Max. 20 ppm
Related Substances (HPLC)	Contact for details
Solubility	Soluble in water; sparingly soluble in organic solvents

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