Description

Sulphur Blue 7 is a synthetic organic dye belonging to the sulfur dye class, known for its deep blue color and excellent fastness properties. This compound is valued for its ability to produce durable, wash-fast, and light-fast colorations on cellulosic fibers. It is a critical component for manufacturers in the textile industry requiring consistent, high-quality blue shades. The product is supplied as a high-purity powder, ensuring reliable performance in industrial dyeing processes.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, and other cellulosic fibers to achieve deep navy and black shades.
• Leather Processing: Used in the dyeing of leather goods, providing rich, uniform blue colors with good rub fastness.
• Paper Coloring: Employed in the production of specialty colored papers and boards.
• Ink Formulation: A pigment source for certain types of printing inks requiring sulfur-based colorants.
• Denim Production: Used in specific processes to achieve classic indigo and blue denim finishes.
• Industrial Coatings: Incorporated into coatings where its color stability is beneficial.

Basic Information

Product Name	Sulphur Blue 7
CAS No.	1327-57-7
Molecular Formula	C34H20N6Na4O16S8
Molecular Weight	1084.98 g/mol
Synonyms	Sulfur Blue 7; C.I. 53440; C.I. Sulphur Blue 7; Sulphur Blue BN; Sulphur Blue BNF; Sulphur Blue 7BN; Hydron Blue R; Kayaku Sulphur Blue 7; Sulphur Navy Blue; Leuco Sulphur Blue 7
EINECS	215-483-8

Quality Control

Our Sulphur Blue 7 is manufactured under a strict quality management system. Every batch is tested to ensure it meets precise specifications for color strength, shade, solubility, and impurity profiles. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing results for key parameters such as assay, moisture content, and heavy metals. Our quality commitment ensures batch-to-batch consistency for your production processes.

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). Keep away from strong oxidizing agents and incompatible materials. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Dark Blue to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Color Strength	100% ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Ash Content	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Particle Size (Passing 80 mesh)	≥ 95%

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