Description

7-Hydroxy-8-[[4-(Phenylazo)Phenyl]Azo]Naphthalene-1,3-Disulphonic Acid is a high-purity, synthetic azo dye intermediate of significant commercial importance. Its value lies in its ability to impart vibrant and stable colors, making it a critical precursor in the production of specialized dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking reliable and consistent raw materials for their formulations.

Application

• Primary Intermediate for Azo Dyes: Serves as a key building block in the synthesis of acid dyes, direct dyes, and reactive dyes, particularly for coloring polyamide fibers like wool and nylon.
• Textile Industry: Used in the manufacturing of dyes that provide excellent color fastness and brightness on natural and synthetic fabrics.
• Ink Formulation: Employed in the production of high-performance inks for various printing applications, including packaging and specialty papers.
• Pigment Manufacturing: Acts as a precursor in the creation of organic pigments used in plastics, coatings, and paints.
• Laboratory & Research: Utilized as a standard or reagent in chemical research focused on dye chemistry, photochemistry, and material science.
• Specialty Chemical Synthesis: Functions as an intermediate for more complex chemical entities in pharmaceutical and agrochemical research (where applicable).

Basic Information

Product Name	7-Hydroxy-8-[[4-(Phenylazo)Phenyl]Azo]Naphthalene-1,3-Disulphonic Acid
CAS No.	25317-39-9
Molecular Formula	C22H15N4O7S2
Molecular Weight	503.51 g/mol
Synonyms	Acid Red 299 (C.I. 18130); 1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[(4-phenylazophenyl)azo]-; 8-[(4-Phenylazophenyl)azo]-7-hydroxy-1,3-naphthalenedisulfonic acid; C.I. Acid Red 299; Azo Dye Intermediate AR299; 7-Hydroxy-8-(p-phenylazophenylazo)naphthalene-1,3-disulfonic acid; Mordant Red 19 (related class)
EINECS	Contact for details

Quality Control

Our 7-Hydroxy-8-[[4-(Phenylazo)Phenyl]Azo]Naphthalene-1,3-Disulphonic Acid is produced under a stringent quality management system. Every batch undergoes rigorous analytical testing to ensure high purity, consistent composition, and batch-to-batch reliability. Standard testing includes identification (IR), assay (HPLC), and control of key impurities. A comprehensive Certificate of Analysis (COA) detailing all specifications and results is provided with each shipment.

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 when not in use to prevent absorption of atmospheric moisture. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark red to brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%
Solubility	Soluble in water, alkaline solutions

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