Description

3-[[3,3'-Dimethyl-4'-[[4-[(Phenylsulfonyl)Oxy]Phenyl]Azo][1,1'-Biphenyl]-4-Yl]Azo]-4-Hydroxy-2,7-Naphthalenedisulfonic Acid Disodium Salt is a high-purity, water-soluble azo dye intermediate known for its excellent chromophore properties and stability. This compound is critical for synthesizing specialized dyes and pigments that require superior lightfastness and vibrant color strength. It is primarily sought by manufacturers in the textile, ink, and specialty coatings industries for producing high-performance colorants.

Application

• Textile Dyeing: As a key intermediate for synthesizing reactive and direct dyes for cotton, wool, and nylon, providing excellent wash and light fastness.
• Ink Manufacturing: Used in the production of high-quality pigments for inks in packaging, printing, and digital applications.
• Industrial Coatings: Serves as a colorant precursor in coatings for plastics, automotive finishes, and other industrial surfaces.
• Functional Dyes: Potential intermediate for dyes used in non-textile applications such as lasers, optical data storage, and liquid crystal displays (LCDs).
• Research & Development: Utilized in chemical research for developing novel chromophores and studying azo dye chemistry and photostability.

Basic Information

Product Name	3-[[3,3'-Dimethyl-4'-[[4-[(Phenylsulfonyl)Oxy]Phenyl]Azo][1,1'-Biphenyl]-4-Yl]Azo]-4-Hydroxy-2,7-Naphthalenedisulfonic Acid Disodium Salt
CAS No.	71701-30-9
Molecular Formula	C36H26N4Na2O10S3
Molecular Weight	824.77 g/mol
Synonyms	Acid Red 337; C.I. 17200; Disodium 4-hydroxy-3-[[4'-[4-(phenylsulfonyloxy)phenylazo]-3,3'-dimethylbiphenyl-4-yl]azo]naphthalene-2,7-disulphonate; 2,7-Naphthalenedisulfonic acid, 3-[[3,3'-dimethyl-4'-[[4-[(phenylsulfonyl)oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-4-hydroxy-, disodium salt; Azo dye intermediate 71701-30-9; C.I. Acid Red 337; Benzenesulfonic acid, 4-[[4'-[2-(4-hydroxy-2,7-disulfo-1-naphthalenyl)diazenyl]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]diazenyl]-, 1-(phenylmethyl) ester, disodium salt
EINECS	Contact for details

Quality Control

Our production of this azo dye intermediate adheres to strict quality control protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed using advanced techniques like HPLC to verify identity and assay. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications is provided with every shipment to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). The product is light-sensitive and should be handled accordingly to maintain stability. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble

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