Description

C.I. Direct Yellow 100 is a high-performance, water-soluble disazo direct dye belonging to the benzidine derivative class. This dye is valued for its strong affinity to cellulosic fibers, providing excellent build-up and good wet fastness properties without the need for a mordant. It is primarily used in the textile industry for dyeing cotton, viscose, and other natural fibers, as well as in the paper and leather industries for coloration applications. Our supply ensures consistent color strength and batch-to-batch uniformity critical for industrial production.

Application

• Primary dyeing of cotton and viscose rayon fabrics and yarns.
• Coloration of paper products, including specialty papers and packaging materials.
• Dyeing of leather goods, offering good penetration and color depth.
• Used in the manufacture of ink for specific printing applications.
• Potential use as a biological stain in laboratory settings (subject to specific grade purity).
• Blending with other direct dyes to achieve a wide range of yellow and green shades.

Basic Information

Product Name	C.I. Direct Yellow 100
CAS No.	12222-59-2
Molecular Formula	C30H26N4Na2O8S2
Molecular Weight	680.66 g/mol
Synonyms	Direct Fast Yellow GC; Direct Yellow GC; C.I. 29025; Direct Yellow 100; Benzoic acid, 5-[[4'-[(2,6-diamino-3-methyl-5-sulfophenyl)azo][1,1'-biphenyl]-4-yl]azo]-2-hydroxy-, disodium salt; Sirius Yellow GC; Chloramine Yellow GC; Pontamine Fast Yellow GC
EINECS	Contact for details

Quality Control

Our C.I. Direct Yellow 100 is manufactured under a strict quality management system. Every batch is tested to ensure it meets precise specifications for color strength, shade, and solubility. We provide comprehensive Certificates of Analysis (COA) that detail purity, impurity profiles, and physical-chemical parameters, ensuring traceability and compliance with your quality 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). Keep away from strong oxidizing agents. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Brownish-yellow to reddish-brown powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Within agreed tolerance
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
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.