Description

Acid Red 142 is a synthetic anionic dye belonging to the azo chemical class, widely recognized for its vibrant red color and good fastness properties. This dye matters for its excellent solubility in water and its strong affinity for protein-based fibers like wool, silk, and nylon, making it a staple for high-quality coloration. Industries that need it include textile manufacturers, leather tanners, and producers of specialty inks and paper, where consistent, brilliant red shades are required. Its reliable performance under acidic dyeing conditions makes it a preferred choice for demanding industrial applications.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers to achieve bright, wash-fast red shades.
• Leather Finishing: Used in the dyeing of leather goods, providing rich and uniform color penetration.
• Paper Coloring: Employed in the production of specialty papers, including decorative and packaging materials.
• Ink Manufacturing: A key component in formulating inks for ballpoint pens, stamp pads, and other writing instruments.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Wood Staining: Applied to impart a red hue to wood and wood-based products.

Basic Information

Product Name	Acid Red 142
CAS No.	6406-66-2
Molecular Formula	C22H14N4Na2O7S2
Molecular Weight	556.48 g/mol
Synonyms	Acid Fast Red A; C.I. Acid Red 142; Acid Leather Red D; Acid Red 2G; Acid Brilliant Red 3B; Naphthalene Red 4B; Acid Red EG; Wool Fast Red A; (4E)-5-Oxo-1-(4-sulfonatophenyl)-4-[(4-sulfonatophenyl)hydrazono]-3-pyrazolecarboxylic acid disodium salt
EINECS	229-077-4

Quality Control

Our Acid Red 142 is produced under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Every lot undergoes comprehensive testing, including spectrophotometric analysis for color strength and purity, HPLC for impurity profiling, and assessment of key physical parameters like solubility and ash content. A Certificate of Analysis (COA) detailing all test results is provided with each shipment to guarantee compliance with your technical specifications and industry standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed when not in use to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Red to dark red powder
Identification (IR)	Conforms to standard
Assay (Color Strength)	≥ 98%
Moisture Content	≤ 5.0%
Water Solubility	Clear solution
Ash Content	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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