Description

7-Hydroxy-8-[[4'-[(4-Hydroxyphenyl)Azo][1,1'-Biphenyl]-4-Yl]Azo]Naphthalene-1,3-Disulphonic Acid is a high-purity, synthetic azo dye intermediate of significant industrial importance. Its value lies in its ability to impart vivid and stable coloration, making it a critical precursor for high-performance pigments and dyes. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking reliable and consistent colorant production.

Application

• Primary Intermediate for Azo Dyes & Pigments: Serves as a key building block in the synthesis of high-quality, complex azo colorants.
• Textile Dye Manufacturing: Used in producing dyes for coloring natural and synthetic fibers, offering good wash and light fastness.
• Industrial Ink Formulation: A crucial component in the manufacture of pigments for printing inks, including packaging and publication inks.
• Specialty Coatings and Paints: Employed to create pigments for automotive, industrial, and decorative coatings requiring durability.
• Plastics and Polymers Coloring: Utilized in the production of colorants for mass-coloration of plastics and synthetic materials.
• Research & Development: Acts as a standard or reagent in chemical research for developing new chromophores and functional materials.

Basic Information

Product Name	7-Hydroxy-8-[[4'-[(4-Hydroxyphenyl)Azo][1,1'-Biphenyl]-4-Yl]Azo]Naphthalene-1,3-Disulphonic Acid
CAS No.	117-33-9
Molecular Formula	C34H22N4O8S2
Molecular Weight	678.69 g/mol
Synonyms	Direct Brown 1; C.I. 30045; 7-Hydroxy-8-[(4'-[(4-hydroxyphenyl)azo][1,1'-biphenyl]-4-yl)azo]naphthalene-1,3-disulfonic acid; Azo Brown; 1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[[4'-[(4-hydroxyphenyl)azo][1,1'-biphenyl]-4-yl]azo]-; C.I. Direct Brown 1; Pontamine Brown BRL; Sirius Brown BRL
EINECS	204-178-7

Quality Control

Our production of 7-Hydroxy-8-[[4'-[(4-Hydroxyphenyl)Azo][1,1'-Biphenyl]-4-Yl]Azo]Naphthalene-1,3-Disulphonic Acid adheres to stringent quality management systems to ensure batch-to-batch consistency and purity. Our products undergo rigorous quality testing to ensure compliance with industry standards. Certificates of Analysis (COA) detailing key parameters such as assay, impurity profile, and physical specifications are available upon request.

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. Due to its complex organic structure, prolonged exposure to elevated temperatures or direct light should be avoided to maintain stability.

Specification

Item	Specification
Appearance	Brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility	Soluble in alkaline water

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