Description

Sodium Hydroxy[2-Hydroxy-3-[(2-Hydroxy-1-Naphthyl)Azo]-5-Nitrobenzenesulphonato(3-)]Chromate(1-) is a complex chromium azo dye, also known as Mordant Black 11, with the CAS number 6370-15-6. This metallized dye is valued for its ability to form stable, deep-colored complexes with various metal ions, offering excellent light and wash fastness properties. It is primarily utilized in the textile industry for dyeing wool, silk, and nylon, as well as in specialized analytical chemistry applications as a metallochromic indicator.

Application

• Textile Dyeing (Mordant Dye): Primary application for dyeing protein fibers like wool and silk, as well as polyamide fibers like nylon, producing deep, fast shades of black and gray.
• Analytical Chemistry Reagent: Used as a metallochromic indicator in complexometric titrations, particularly for the determination of calcium, magnesium, and other metal ions.
• Leather Dyeing: Employed in the coloring of leather goods where high color fastness is required.
• Ink Formulation: A component in the manufacture of specialized inks requiring specific color properties and stability.
• Research & Development: Serves as a key intermediate or reference standard in chemical synthesis and dye research laboratories.
• Histological Staining: Potential use in biological staining techniques for microscopy.

Basic Information

Item	Details
Product Name	Sodium Hydroxy[2-Hydroxy-3-[(2-Hydroxy-1-Naphthyl)Azo]-5-Nitrobenzenesulphonato(3-)]Chromate(1-)
CAS No.	6370-15-6
Molecular Formula	C17H11CrN3NaO8S
Molecular Weight	492.34 g/mol
Synonyms	Mordant Black 11; C.I. 14645; Chromazol Black E; Eriochrome Black T; Solochrome Black T; Acid Chrome Black T; Sodium 2-Hydroxy-1-(2-hydroxy-1-naphthylazo)-6-nitro-4-sulfonato-1-naphtholatochromate(1-); 1-Naphthol, 2-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]-5-nitrobenzenesulfonic acid chromium complex sodium salt
EINECS	228-925-3

Quality Control

Our Sodium Hydroxy[2-Hydroxy-3-[(2-Hydroxy-1-Naphthyl)Azo]-5-Nitrobenzenesulphonato(3-)]Chromate(1-) is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for dye content, purity, and performance characteristics. A comprehensive Certificate of Analysis (COA) detailing identity, assay, and impurity profiles is provided with every shipment to guarantee batch-to-batch consistency and compliance with your application requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This compound is hygroscopic (moisture-sensitive); therefore, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product performance and stability.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (Dye Content)	Min. 85%
Loss on Drying	Max. 5.0%
Water Solubility	Freely 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.