Description

Disodium 7,7'-[Azobis(4,1-Phenylenecarbonylimino)]Bis[4-Hydroxy-3-[[2-Hydroxy-5-(Methylsulphonyl)Phenyl]Azo]Naphthalene-2-Sulphonate] is a high-purity, complex synthetic dye intermediate characterized by its azo and disulfonate functional groups. This compound matters for its role as a critical precursor in the production of high-performance, colorfast dyes and pigments, offering excellent thermal stability and chromophore properties. It is primarily needed by manufacturers in the textile, ink, and specialty coatings industries seeking to develop vibrant and durable colors.

Application

This advanced chemical intermediate serves as a key building block in several high-value industrial processes:

• Primary precursor for high-grade azo dyes used in textile coloring.
• Manufacturing of pigments for industrial inks, including printing and packaging inks.
• Synthesis of colorants for specialty coatings and paints requiring enhanced lightfastness.
• Research and development of novel chromophores for advanced material science applications.
• Production of color filters and optical materials.
• Potential intermediate in the synthesis of functional dyes for non-textile applications.

Basic Information

Product Name	Disodium 7,7'-[Azobis(4,1-Phenylenecarbonylimino)]Bis[4-Hydroxy-3-[[2-Hydroxy-5-(Methylsulphonyl)Phenyl]Azo]Naphthalene-2-Sulphonate]
CAS No.	70210-36-5
Molecular Formula	C52H34N8Na2O16S4
Molecular Weight	1192.1 g/mol (approx.)
Synonyms	Disodium 7,7'-(carbonyldiimino)bis[4-hydroxy-3-[2-(2-hydroxy-5-methylsulfonylphenyl)diazenyl]naphthalene-2-sulfonate]; C.I. Reactive Black 5 Intermediate; Azo Dye Intermediate 70210-36-5; Bis(azo) naphthalene disulfonate derivative; Reactive dye precursor; Tetrasulfonated bis-azo compound; CAS 70210-36-5
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and purity. Each lot is analyzed using advanced chromatographic and spectroscopic techniques to verify identity and assay. Certificates of Analysis (COA) detailing purity, impurity profile, and physical specifications are 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed when not in use to prevent absorption of atmospheric moisture, which can affect product performance and stability.

Specification

Item	Specification
Appearance	Dark colored powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 2.0%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%

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