Description

4-[(4-Hydroxy-1-Naphthyl)Azo]Naphthalenesulphonic Acid is a specialized azo dye intermediate known for its distinct chromophoric properties. This compound is valued for its role in synthesizing high-performance dyes and pigments with excellent color fastness and stability. It is primarily required by manufacturers in the textile, ink, and specialty chemical industries for producing vivid and durable colorants.

Application

• Primary intermediate for the synthesis of azo dyes and pigments used in textile coloring.
• Key component in manufacturing printing inks for packaging and commercial printing.
• Used in the production of colorants for plastics and synthetic polymers.
• Potential use as a staining agent or colorimetric reagent in laboratory and analytical applications.
• Intermediate for specialty dyes used in leather and paper industries.
• Research and development of novel functional dyes for non-textile applications.

Basic Information

Product Name	4-[(4-Hydroxy-1-Naphthyl)Azo]Naphthalenesulphonic Acid
CAS No.	23481-28-9
Molecular Formula	C₂₀H₁₄N₂O₄S
Molecular Weight	378.40 g/mol
Synonyms	4-[(4-Hydroxy-1-naphthyl)azo]naphthalene-1-sulfonic acid; 1-Naphthalenesulfonic acid, 4-[(4-hydroxy-1-naphthalenyl)azo]-; C.I. 15865; Acid Orange 20 (related); 4-(4-Hydroxy-1-naphthylazo)-1-naphthalenesulfonic acid; 1-Naphthalenesulfonic acid, 4-[(4-hydroxy-1-naphthyl)azo]-; 4-Hydroxy-1-naphthylazonaphthalenesulfonic acid
EINECS	Contact for details

Quality Control

Our 4-[(4-Hydroxy-1-Naphthyl)Azo]Naphthalenesulphonic Acid is produced under strict quality management systems. Every batch undergoes rigorous analytical testing to ensure consistent purity and performance as a dye intermediate. Certificates of Analysis (COA) detailing identity, assay, and impurity profiles are available upon request to support your quality assurance protocols.

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 nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 1.0%

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