Description

Direct Yellow 62 (C.I. 36900) is a synthetic, water-soluble disazo direct dye belonging to the benzidine derivative class. It is valued for its strong affinity to cellulosic fibers like cotton and rayon, providing good wash fastness and level dyeing properties. This dye is essential for manufacturers in the textile industry, particularly for producing yellow to orange shades on fabrics, paper, and leather.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose rayon, and other cellulosic fibers in exhaust and continuous dyeing processes.
• Paper Coloring: Used in the mass coloration of paper and paperboard to achieve consistent yellow hues.
• Leather Finishing: Employed in the dyeing of leather goods, providing color to finished products.
• Ink Formulation: A colorant component in the manufacture of certain inks and toners.
• Biological Staining: Potential use as a histological stain in laboratory settings.

Basic Information

Product Name	Direct Yellow 62
CAS No.	6409-90-1
Molecular Formula	C30H26N4Na2O8S2
Molecular Weight	680.66 g/mol
Synonyms	Direct Yellow 62; C.I. 36900; C.I. Direct Yellow 62; Direct Fast Yellow R; Direct Yellow R; Pontamine Fast Yellow R; Benzo Fast Yellow R; Sirius Supra Yellow R; Chlorazol Yellow R; Aizen Direct Fast Yellow R; 2,2'-[4,4'-Biphenylylenebis(azo)]bis[5-aminobenzenesulfonic acid] disodium salt
EINECS	229-077-7

Quality Control

Our Direct Yellow 62 is manufactured under strict quality management systems to ensure batch-to-batch consistency and performance. Each lot is tested against stringent in-house specifications for critical parameters including color strength, shade, solubility, and impurity profile. A Certificate of Analysis (COA) detailing these results is provided with every shipment.

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.

Specification

Item	Specification
Appearance	Yellow to orange-brown 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%
Solubility in Water	Conforms
pH (1% Solution)	6.0 - 8.0

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