Description

C.I.Direct Yellow 32 is a substantive anionic dye belonging to the direct dye class, valued for its strong affinity to cellulosic fibers without the need for a mordant. Its primary commercial value lies in providing a bright, economical, and wash-fast yellow coloration in aqueous dyeing processes. This product is essential for manufacturers in the textile, paper, and leather industries seeking efficient and consistent dyeing results.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, rayon, and other cellulosic fibers to achieve a bright yellow shade.
• Paper Coloring: Used in the mass coloration of paper products, including tissue, packaging, and specialty papers.
• Leather Finishing: Imparts color to leather goods, offering good penetration and uniformity on tanned hides.
• Ink Formulation: Serves as a colorant in the manufacture of certain types of inks, including those for flexographic and packaging applications.
• Biological Staining: Can be utilized in specific histological or microbiological staining protocols as a contrast agent.

Basic Information

Product Name	C.I. Direct Yellow 32
CAS No.	12222-57-0
Molecular Formula	C30H26N4Na2O8S2
Molecular Weight	680.66 g/mol
Synonyms	Direct Yellow G; Direct Fast Yellow G; C.I. 29050; Direct Yellow 5G; Sirius Yellow G; Benzo Fast Yellow G; Chloramine Yellow G; Diphenyl Yellow G; Pyrazol Yellow G; Diazol Yellow G; Direct Yellow GG; Atlantic Direct Yellow G
EINECS	235-415-6

Quality Control

Our production of C.I. Direct Yellow 32 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Each lot is analyzed for key parameters including color strength, shade, solubility, and impurity profile to meet industry specifications. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and conformance is available for every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents. The product is light-sensitive; prolonged exposure to light should be avoided to prevent degradation.

Specification

Item	Specification
Appearance	Brownish-yellow to reddish-yellow 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 (Clear solution at specified concentration)
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.