Description

Trisodium 3-Hydroxy-4-[(4-Sulphonatophenyl)Azo]Naphthalene-2,7-Disulphonate is a high-purity, water-soluble azo dye intermediate and analytical reagent. This compound is valued for its strong chromophoric properties and consistent performance in demanding industrial and laboratory processes. It is essential for manufacturers and researchers in the dye, pigment, and analytical chemistry sectors who require a reliable and high-quality source of this specific chemical entity.

Application

• Dye and Pigment Intermediate: A key precursor in the synthesis of acid dyes, direct dyes, and food colorants, particularly for shades of orange and red.
• Analytical Chemistry Reagent: Used as a complexometric indicator and a chromogenic agent in spectrophotometric analysis and titration methods.
• Biological Staining: Employed in histological and cytological staining procedures for microscopic examination.
• Textile Industry: Utilized in the dyeing and printing of protein fibers like wool and silk, as well as polyamide fibers.
• Ink Manufacturing: Serves as a colorant component in the formulation of specialty inks.
• Research & Development: A critical compound for chemical research, particularly in studies involving azo chemistry and color science.

Basic Information

Product Name	Trisodium 3-Hydroxy-4-[(4-Sulphonatophenyl)Azo]Naphthalene-2,7-Disulphonate
CAS No.	50880-65-4
Molecular Formula	C16H9N2Na3O10S3
Molecular Weight	562.39 g/mol
Synonyms	Acid Orange 7, Sodium 4-[(4-Sulfophenyl)azo]-3-hydroxynaphthalene-2,7-disulfonate; C.I. 15510; Orange II; Tropaeolin D; 3-Hydroxy-4-(4-sulfophenyl)azo)naphthalene-2,7-disulfonic acid trisodium salt; D&C Orange No. 4; Food Orange 2
EINECS	256-705-4

Quality Control

Our Trisodium 3-Hydroxy-4-[(4-Sulphonatophenyl)Azo]Naphthalene-2,7-Disulphonate is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets stringent specifications for dye and reagent applications. Certificates of Analysis (COA) documenting assay, impurity profile, and physical properties are available upon request.

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. The product is light-sensitive and should be stored away from direct light exposure.

Specification

Item	Specification
Appearance	Orange to red powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	28.0 - 35.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm

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