Description

7,7'-Ureylenebis[4-Hydroxy-3-[[3-[(2,4-Dihydroxyphenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulfonic Acid Sodium] Salt is a high-purity, complex azo dye intermediate essential for producing vivid and stable colorants. This compound is valued for its ability to form strong covalent bonds with substrates, resulting in excellent lightfastness and wash resistance in the final product. It is a critical raw material for manufacturers of industrial dyes, pigments, and specialty colorants targeting textiles, inks, and high-performance coatings.

Application

• Primary intermediate for the synthesis of high-performance azo dyes and pigments.
• Manufacturing of colorants for textile dyeing and printing, particularly for cotton and nylon.
• Production of specialty inks for packaging, security printing, and digital applications.
• Key component in formulating industrial and automotive coatings requiring superior color stability.
• Used in the development of paper colorants and functional dyes.
• Research and development of novel optical materials and sensors.

Basic Information

Product Name	7,7'-Ureylenebis[4-Hydroxy-3-[[3-[(2,4-Dihydroxyphenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulfonic Acid Sodium] Salt
CAS No.	6428-34-8
Molecular Formula	C52H32N10O14S2Na2
Molecular Weight	1122.96 g/mol
Synonyms	Direct Black 22 (C.I. 35435); Sodium 7,7'-ureylenebis(4-hydroxy-3-((3-((2,4-dihydroxyphenyl)azo)phenyl)azo)-2-naphthalenesulfonate); C.I. Direct Black 22; Direct Black 22, Sodium Salt; 7,7'-Ureylenebis[4-hydroxy-3-[[3-[(2,4-dihydroxyphenyl)azo]phenyl]azo]-2-naphthalenesulfonic acid] disodium salt; Direct Black 22A; Pontamine Black E
EINECS	229-213-1

Quality Control

Our production of this azo dye intermediate adheres to stringent ISO 9001 quality management protocols. Every batch is analyzed to meet precise chemical and physical specifications, ensuring consistency for downstream synthesis. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with each shipment to guarantee traceability and compliance with your formulation requirements.

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). This material is hygroscopic (moisture-sensitive); keep the original container tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Sulfated Ash	≤ 20.0%
Water Solubility	Conforms
Heavy Metals (as Pb)	≤ 20 ppm

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