Description

4-Chloro-5-Hydroxynaphthalene-2,7-Disulphonic Acid is a key naphthalene-based intermediate and dye precursor with significant industrial utility. Its value lies in its functionalized structure, which allows for further chemical modifications to create a range of specialized colorants and functional chemicals. This compound is primarily required by manufacturers in the dye and pigment industry, as well as by research and development laboratories focused on organic synthesis and material science.

Application

• Dye and Pigment Intermediate: A crucial building block for the synthesis of azo dyes, acid dyes, and reactive dyes, particularly for textiles and leather.
• Chemical Synthesis: Used as a starting material or intermediate in the production of more complex organic compounds and specialty chemicals.
• Research & Development: Serves as a valuable reagent in academic and industrial R&D for exploring new synthetic pathways and functional materials.
• Analytical Chemistry: Can be employed as a standard or reagent in specific analytical methods and calibration processes.

Basic Information

Product Name	4-Chloro-5-Hydroxynaphthalene-2,7-Disulphonic Acid
CAS No.	90-21-1
Molecular Formula	C₁₀H₇ClO₇S₂
Molecular Weight	338.74 g/mol
Synonyms	4-Chloro-5-hydroxy-2,7-naphthalenedisulfonic acid; 5-Hydroxy-4-chloro-2,7-naphthalenedisulfonic acid; 2,7-Naphthalenedisulfonic acid, 4-chloro-5-hydroxy-; 4-Chloro-5-hydroxynaphthalene-2,7-disulfonic acid; 90-21-1; 4-Chloro-5-hydroxynaphthalene-2,7-disulphonate; 4-Chloro-5-hydroxynaphthalenedisulfonic acid
EINECS	201-976-5

Quality Control

Our 4-Chloro-5-Hydroxynaphthalene-2,7-Disulphonic Acid is produced under strict quality management protocols. Each batch undergoes rigorous analytical testing to ensure identity, purity, and consistency. A comprehensive Certificate of Analysis (COA) detailing specifications such as assay, impurity profile, and physical characteristics is provided with every shipment to guarantee it meets your technical 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 (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling.

Specification

Item	Specification
Appearance	Off-white to light brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%

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