Description

C.I.Acid Yellow 163 is a synthetic acid dye belonging to the azo chemical class, valued for its bright, stable yellow hue. It is engineered to deliver excellent color fastness and dyeing uniformity on protein-based fibers like wool, silk, and nylon. This product is essential for manufacturers in the textile, leather, and specialty paper industries seeking reliable and vibrant coloration. Its consistent performance makes it a key component for producing high-quality dyed goods for global markets.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers, offering good wash and light fastness.
• Leather Finishing: Used for coloring leather goods, providing rich and even shades.
• Paper Staining: Employed in the production of specialty and decorative papers.
• Ink Formulation: A colorant component for certain types of inks and toners.
• Biological Staining: Potential use as a microscopic stain in laboratory settings (subject to specific grade purity).

Basic Information

Product Name	C.I.Acid Yellow 163
CAS No.	12235-25-5
Molecular Formula	C16H12N4Na2O8S2
Molecular Weight	514.40 g/mol
Synonyms	Acid Yellow 163; C.I. 13245; Acid Leather Yellow N-2R; Acid Fast Yellow E-3G; Acid Yellow E-3G; Acid Yellow N-2R; 7-Hydroxy-8-[(E)-(4-nitrophenyl)diazenyl]-1,3-naphthalenedisulfonic Acid Disodium Salt; 1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[(E)-2-(4-nitrophenyl)diazen-1-yl]-, sodium salt (1:2)
EINECS	Contact for details

Quality Control

Our production of C.I.Acid Yellow 163 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is tested against key parameters including color strength, shade, solubility, and impurity profiles. Certificates of Analysis (COA) documenting these results are provided to guarantee the product meets your specific 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). Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Ash Content	≤ 30.0%

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