Description

C.I. Acid Yellow 131 is a synthetic organic dye belonging to the azo class, widely recognized for its bright and stable yellow hue. This high-performance colorant is valued for its excellent light and wash fastness properties, making it a reliable choice for demanding applications. It is primarily utilized in the textile industry for dyeing polyamide fibers like nylon, as well as in the coloration of leather, paper, and certain specialty inks.

Application

• Textile Dyeing: Primary application for dyeing nylon and polyamide fibers to achieve vibrant, fast yellow shades.
• Leather Coloring: Used in the dyeing of leather goods, providing good penetration and color uniformity.
• Paper Staining: Employed in the production of colored papers and paper products.
• Ink Formulation: Suitable for specialty inks where a stable yellow colorant is required.
• Wood Staining: Can be used in formulations for staining wood and related materials.
• Biological Staining: Potential use as a microscopic stain in specific biological applications.

Basic Information

Product Name	C.I. Acid Yellow 131
CAS No.	58856-86-3
Molecular Formula	C16H13N4NaO4S
Molecular Weight	380.35 g/mol
Synonyms	Acid Yellow 131; Acid Leather Yellow GRL; C.I. 23290; Nylosan Yellow E-GRL; Telon Yellow GRL; Acid Fast Yellow E-GRL; 7-Hydroxy-8-[(E)-(4-nitrophenyl)diazenyl]naphthalene-1,3-disulfonic acid sodium salt; Sodium 7-hydroxy-8-[(E)-(4-nitrophenyl)diazenyl]naphthalene-1,3-disulfonate
EINECS	Contact for details

Quality Control

Our C.I. Acid Yellow 131 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 such as color strength, shade, solubility, and impurity profile. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance tests is provided with every shipment to guarantee it meets your application 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). This product is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Ash Content	≤ 1.0%

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