Description

Direct Blue 151 is a synthetic, water-soluble azo dye belonging to the direct dye class, widely recognized for its strong affinity to cellulosic fibers. Its primary value lies in providing a deep, vibrant blue shade with excellent build-up and good wet fastness properties on cotton, viscose, and other natural materials. This dye is essential for manufacturers in the textile industry seeking efficient and cost-effective coloring solutions for yarn, fabric, and garment production. Direct Blue 151 CAS NO 110735-25-6 is also utilized in the paper and leather industries for its substantive coloring power.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cotton, viscose, rayon, and other cellulosic fibers to achieve deep blue shades.
• Paper Coloring: Used in the surface coloring and tinting of paper products, including specialty papers and packaging materials.
• Leather Finishing: Applied in the dyeing of leather goods, providing rich color for footwear, apparel, and upholstery.
• Ink Formulation: Serves as a colorant in the manufacture of certain inks, particularly for non-impact printing and specialty applications.
• Biological Staining: Employed in some histological and microbiological staining procedures as a contrast agent.

Basic Information

Product Name	Direct Blue 151
CAS No.	110735-25-6
Molecular Formula	C34H24N6Na4O16S4
Molecular Weight	1028.86 g/mol
Synonyms	Direct Blue 151; C.I. Direct Blue 151; Direct Blue 2B; Direct Blue B2RL; Amanil Sky Blue 2B; Atul Direct Sky Blue 2B; Dinamine Sky Blue 2B; Solophenyl Blue 2B; Sirius Blue 2B; C.I. 24175
EINECS	Contact for details

Quality Control

Our Direct Blue 151 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Each lot undergoes comprehensive analytical testing, including spectrophotometric analysis for strength and shade, HPLC for purity, and assessments of solubility and fastness properties. A Certificate of Analysis (COA) detailing all relevant specifications is provided with every shipment to support your quality assurance protocols.

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); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Dark Blue to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to Standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Fastness Properties	Contact for details

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