Description

Acidyellowa4R is a synthetic organic dye belonging to the azo dye class, identified by CAS No. 70865-95-1. This high-purity colorant is valued for its strong, stable yellow hue and excellent compatibility with various substrates. It is primarily utilized in industrial applications where consistent color performance and batch-to-batch reliability are critical. Key sectors requiring this product include textile dyeing, paper coloration, and specialty ink manufacturing.

Application

• Textile Dyeing: Used for dyeing natural and synthetic fibers, including cotton, wool, and polyamide, to achieve vibrant yellow shades.
• Paper Coloring: Employed in the production of colored paper, tissues, and packaging materials.
• Ink Formulation: A key pigment for manufacturing printing inks, including flexographic and packaging inks.
• Leather Finishing: Applied in the dyeing process for leather goods to provide uniform and durable coloration.
• Plastics and Polymers: Incorporated as a colorant for masterbatches and polymer resins.
• Research & Development: Serves as a reference standard or intermediate in chemical synthesis and analytical laboratories.

Basic Information

Product Name	Acidyellowa4R
CAS No.	70865-95-1
Molecular Formula	C16H12N4Na2O7S2
Molecular Weight	502.40 g/mol
Synonyms	Acid Yellow A4R; C.I. Acid Yellow 151; Acid Yellow 151; Acid Yellow A-4R; Acid Yellow AR; Acid Yellow 4R; Acid Yellow A4R (C.I. 151); 2,7-Naphthalenedisulfonic acid, 5-(acetylamino)-4-hydroxy-3-[(2-methylphenyl)azo]-, disodium salt
EINECS	Contact for details

Quality Control

Our Acidyellowa4R is manufactured under a strict quality management system to ensure it meets the high standards required for industrial applications. Each batch is tested for critical parameters including color strength, purity, and solubility. A Certificate of Analysis (COA) documenting these results is available for every shipment to guarantee traceability and compliance with your specifications.

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 and sources of ignition.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Clear solution
Ash Content	≤ 1.0%

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