Description

Hexasodium Hydrogen Bis[4-Hydroxy-3-[(2-Hydroxy-5-Nitro-3-Sulphophenyl)Azo]-6-[(Sulphomethyl)Amino]Naphthalene-2-Sulphonato(5-)]Chromate(7-) is a complex chromium-based azo dye, also known as Acid Black 52. This high-performance dye is valued for its excellent color fastness and strong affinity to protein-based fibers like wool and silk. It is primarily needed by manufacturers in the textile, leather tanning, and specialty ink industries for producing deep, durable black shades.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon to achieve deep black and navy shades with good wash and light fastness.
• Leather Processing: Used in the dyeing and finishing of leather goods, providing uniform and rich coloration.
• Ink Manufacturing: A key component in the formulation of specialty inks for writing, printing, and marking.
• Paper Coloration: Employed for tinting specialty papers where color stability is required.
• Biological Staining: Potential use as a histological stain in laboratory settings due to its metal-complex structure.
• Research & Development: Serves as a chemical intermediate or reference standard in synthetic chemistry and dye research.

Basic Information

Product Name	Hexasodium Hydrogen Bis[4-Hydroxy-3-[(2-Hydroxy-5-Nitro-3-Sulphophenyl)Azo]-6-[(Sulphomethyl)Amino]Naphthalene-2-Sulphonato(5-)]Chromate(7-)
CAS No.	6408-22-6
Molecular Formula	C34H18CrN8Na6O22S6
Molecular Weight	1371.04 g/mol (approx.)
Synonyms	Acid Black 52; C.I. 15711; Chromate(7-), bis[4-hydroxy-3-[(2-hydroxy-5-nitro-3-sulfophenyl)azo]-6-[(sulfomethyl)amino]-2-naphthalenesulfonato(5-)]-, hydrogen, hexasodium salt; Hexasodium 3-hydroxy-4-[(2-hydroxy-5-nitrophenyl)azo]-6-[(sulfomethyl)amino]-2-naphthalenesulfonato(5-)]chromate(7-); Acid Leather Black NB; Dermina Black B; Supranol Fast Black B; Telon Fast Black B
EINECS	229-077-1

Quality Control

Our production of Acid Black 52 adheres to stringent quality protocols to ensure batch-to-batch consistency and performance. Every lot is tested against industry-standard specifications for parameters such as dye content, shade, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing purity, strength, and physical properties is provided with each shipment to guarantee compliance with your application 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). Due to its hygroscopic nature, the container must be kept sealed to prevent moisture absorption, which can affect product performance and flow characteristics.

Specification

Item	Specification
Appearance	Black to dark blue powder
Identification (IR)	Conforms to structure
Assay (Dye Content)	Min. 95%
Moisture Content	Max. 5.0%
Water Solubility	Completely soluble
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	Max. 20 ppm
Chromium Content	Contact for details

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