Description

J Acid CAS NO 87-02-5 is a high-purity, naphthalene-based intermediate essential for the synthesis of azo dyes and pigments. This compound is valued for its ability to impart bright, lightfast shades of red, violet, and blue, making it a cornerstone chemical for colorant manufacturers. It is primarily required by industries involved in the production of textiles, inks, and specialty papers, where consistent color quality and batch-to-batch reliability are critical.

Application

• Primary intermediate for the synthesis of azo dyes and pigments, particularly for cotton and other cellulose fibers.
• Manufacturing of reactive dyes used in textile printing and dyeing processes.
• Key building block for acid dyes applied to wool, silk, and nylon.
• Production of direct dyes for paper coloring and ink formulations.
• Used in research and development of specialty colorants and high-performance pigments.
• Intermediate in the synthesis of certain optical brighteners and fluorescent whitening agents.

Basic Information

Product Name	J Acid
CAS No.	87-02-5
Molecular Formula	C10H9NO4S
Molecular Weight	239.25 g/mol
Synonyms	6-Amino-4-hydroxy-2-naphthalenesulfonic acid; 6-Amino-1-naphthol-3-sulfonic acid; 2-Amino-5-naphthol-7-sulfonic acid; 7-Amino-4-hydroxy-2-naphthalenesulfonic acid; J Acid (free acid); J-Acid; J Acid (dye intermediate)
EINECS	201-719-2

Quality Control

Our J Acid is manufactured under a stringent quality management system to ensure high purity and consistent performance. Each batch is tested against rigorous internal specifications, which typically include assay (HPLC), identification (IR), and control of key impurities. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and compliance with your quality 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). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product quality.

Specification

Item	Specification
Appearance	Off-white to grayish powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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