Description

Disodium 6-Amino-4-Hydroxy-5-[(4-Nitro-2-Sulphonatophenyl)Azo]Naphthalene-2-Sulphonate is a high-purity, water-soluble azo dye intermediate essential for producing vibrant and stable colorants. This compound matters for its role as a key precursor in synthesizing specific acid dyes and pigments, offering excellent tinctorial strength and compatibility with various substrates. Industrial manufacturers in the textile, leather, and specialty ink sectors rely on this consistent-quality intermediate to ensure the performance and colorfastness of their final products.

Application

• Primary intermediate for the synthesis of acid dyes used in wool, silk, and nylon textile dyeing.
• Key component in the production of leather dyes, providing deep, uniform coloration.
• Used in the manufacture of paper colorants for specialty and decorative papers.
• Precursor for inkjet ink pigments, particularly for industrial and textile printing applications.
• Employed in research and development for creating novel functional dyes with specific optical properties.
• Potential use as a staining agent or colorimetric indicator in analytical chemistry and laboratory research.

Basic Information

Item	Details
Product Name	Disodium 6-Amino-4-Hydroxy-5-[(4-Nitro-2-Sulphonatophenyl)Azo]Naphthalene-2-Sulphonate
CAS No.	6441-91-4
Molecular Formula	C16H9N4Na2O10S2
Molecular Weight	534.37 g/mol
Synonyms	Acid Red 337; C.I. 17200; 6-Amino-4-hydroxy-5-[(4-nitro-2-sulfophenyl)azo]-2-naphthalenesulfonic acid disodium salt; Disodium 6-amino-4-hydroxy-5-[(4-nitro-2-sulfonatophenyl)azo]naphthalene-2-sulfonate; Azo dye intermediate 6441-91-4; 2-Naphthalenesulfonic acid, 6-amino-4-hydroxy-5-[(4-nitro-2-sulfophenyl)azo]-, disodium salt; C.I. Acid Red 337
EINECS	229-237-8

Quality Control

Our production of Disodium 6-Amino-4-Hydroxy-5-[(4-Nitro-2-Sulphonatophenyl)Azo]Naphthalene-2-Sulphonate adheres to stringent quality management protocols to ensure batch-to-batch consistency and reliability. The product undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to meet exacting industry specifications. Certificates of Analysis (COA) documenting all key parameters are provided with every shipment to support your quality assurance processes.

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 opening to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 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.