Description

4-Hydroxy-3-[(2-Hydroxy-1-Naphthyl)Azo]-5-Methylbenzenesulphonic Acid is a high-purity azo dye intermediate and analytical reagent. This compound is valued for its precise chemical structure, which is critical for producing consistent and vibrant colorants in demanding applications. It is primarily required by manufacturers in the dye and pigment industry, as well as by research laboratories for use as a chromogenic agent in chemical analysis.

Application

• Primary intermediate for the synthesis of high-performance azo dyes and pigments.
• Key component in the production of textile colorants for natural and synthetic fibers.
• Used in the formulation of specialized inks for printing and packaging.
• Acts as a chromogenic reagent in analytical chemistry for metal ion detection and complexometric titrations.
• Potential use in the development of functional dyes for non-textile applications, such as in optical media or sensors.
• Employed in research and development for novel colorant systems and photochemical studies.

Basic Information

Product Name	4-Hydroxy-3-[(2-Hydroxy-1-Naphthyl)Azo]-5-Methylbenzenesulphonic Acid
CAS No.	85136-63-6
Molecular Formula	C₁₈H₁₄N₂O₅S
Molecular Weight	370.38 g/mol
Synonyms	5-Methyl-4-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]benzenesulfonic acid; C.I. Mordant Yellow 5; Acid Mordant Yellow 5; Mordant Yellow 5; 4-Hydroxy-3-[(2-hydroxy-1-naphthalenyl)azo]-5-methylbenzenesulfonic acid; Benzenesulfonic acid, 4-hydroxy-3-[(2-hydroxy-1-naphthalenyl)azo]-5-methyl-; 1-Naphthalenesulfonic acid, 3,4-dihydro-3-[(2-hydroxy-5-methylphenyl)azo]-4-oxo-
EINECS	Contact for details

Quality Control

Our production of 4-Hydroxy-3-[(2-Hydroxy-1-Naphthyl)Azo]-5-Methylbenzenesulphonic Acid adheres to stringent quality protocols to ensure batch-to-batch consistency and reliability. Each lot is analyzed against comprehensive specifications, including identity, purity, and impurity profiles. Certificates of Analysis (COA) documenting these results are available upon request to support your quality assurance and regulatory compliance needs.

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). This material is light-sensitive (store away from light) and hygroscopic (moisture-sensitive); ensure containers are kept sealed to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	Orange to 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

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