Description

4-Hydroxynaphthalene-1,5-Disulphonic Acid is a key aromatic sulfonic acid derivative used as a versatile intermediate in the synthesis of dyes and pigments. Its molecular structure, featuring both hydroxyl and sulfonic acid groups, makes it a crucial building block for creating azo dyes and other colorants with specific properties. This compound is essential for manufacturers in the dye, textile, and specialty chemical industries seeking to produce vibrant and stable colors.

Application

• Primary Intermediate for Azo Dyes: Serves as a key coupling component in the production of acid dyes, direct dyes, and reactive dyes for textiles, leather, and paper.
• Pigment Manufacturing: Used in the synthesis of organic pigments for inks, plastics, and coatings, providing good lightfastness and color strength.
• Chemical Synthesis: Acts as a versatile intermediate for further chemical transformations, including the production of more complex sulfonated compounds.
• Research & Development: Employed in laboratory settings for the development of new dye molecules and functional materials.

Basic Information

Product Name	4-Hydroxynaphthalene-1,5-Disulphonic Acid
CAS No.	117-56-6
Molecular Formula	C₁₀H₈O₇S₂
Molecular Weight	304.30 g/mol
Synonyms	1,5-Naphthalenedisulfonic acid, 4-hydroxy-; 4-Hydroxy-1,5-naphthalenedisulfonic acid; 1-Naphthol-4,8-disulfonic acid; 4-Hydroxynaphthalene-1,5-disulfonic acid; Chicago acid; SS acid; 1,5-Acid; 4-Hydroxy-1,5-NDSA
EINECS	204-204-5

Quality Control

Our production of 4-Hydroxynaphthalene-1,5-Disulphonic Acid adheres to stringent quality management protocols to ensure batch-to-batch consistency and purity. Each lot is analyzed against comprehensive specifications, including assay, impurity profile, and physical characteristics. Certificates of Analysis (COA) documenting these results are provided with every shipment to support your quality assurance processes.

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 and strong bases. The material is hygroscopic (moisture-sensitive); ensure containers are kept tightly sealed when not in use.

Specification

Item	Specification
Appearance	Off-white to light brown crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
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.