Description

Acid Yellow 99 is a synthetic organic dye belonging to the azo chemical class, valued for its bright and stable yellow hue. It is a critical component for achieving consistent and durable coloration in demanding industrial applications. This product is essential for manufacturers in the textile, leather, and paper industries seeking high-performance colorants for their processes.

Application

• Primary dye for wool, silk, and polyamide (nylon) fibers in the textile industry.
• Coloration of leather goods, providing excellent coverage and fastness properties.
• Manufacturing of colored paper and specialty paper products.
• Used in the formulation of inks for various printing applications.
• Potential use as a biological stain in microscopy and laboratory settings.
• Dyeing of anodized aluminum for decorative and identification purposes.

Basic Information

Product Name	Acid Yellow 99
CAS No.	10343-58-5
Molecular Formula	C16H13N4NaO4S
Molecular Weight	380.35 g/mol
Synonyms	Acid Fast Yellow A; C.I. 13900; Acid Yellow A; Lissamine Fast Yellow A; Wool Fast Yellow A; Acid Leather Yellow A; 7-Hydroxy-8-[(E)-phenyldiazenyl]-5-sulfonaphthalene-1-azo]-naphthalene-2-sulfonic acid disodium salt
EINECS	233-744-2

Quality Control

Our Acid Yellow 99 is manufactured under a strict quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against key parameters including color strength, shade, solubility, and impurity profile. Certificates of Analysis (COA) documenting purity and conformance to agreed specifications are available upon request.

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 incompatible materials. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95%
Moisture Content	≤ 5.0%
Water Solubility	Freely soluble
Ash Content	≤ 1.0%

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