Description

Sodium 6-Hydroxy-5-[[4-(o-Tolylazo)-o-Tolyl]Azo]Naphthalene-2-Sulphonate is a high-purity, water-soluble azo dye intermediate essential for producing vivid and stable colorants. This compound matters for its role in creating specialized dyes with excellent light and wash fastness properties for demanding applications. It is primarily needed by manufacturers in the textile, ink, and specialty coatings industries seeking reliable and consistent color performance.

Application

• Primary intermediate for the synthesis of high-performance azo dyes and pigments.
• Key component in the production of textile dyes for cotton, wool, and synthetic fibers.
• Used in formulating printing inks for packaging and commercial printing.
• Manufacture of colorants for leather and paper products.
• Potential use in the synthesis of specialized lakes and toners for plastics and coatings.
• Research and development of novel functional dyes for non-textile applications.

Basic Information

Product Name	Sodium 6-Hydroxy-5-[[4-(o-Tolylazo)-o-Tolyl]Azo]Naphthalene-2-Sulphonate
CAS No.	7357-71-3
Molecular Formula	C24H18N4NaO4S
Molecular Weight	481.48 g/mol
Synonyms	Acid Orange 156; C.I. 26501; Sodium 6-hydroxy-5-[(2-methyl-4-[(2-methylphenyl)azo]phenyl)azo]naphthalene-2-sulphonate; 2-Naphthalenesulfonic acid, 6-hydroxy-5-((2-methyl-4-((2-methylphenyl)azo)phenyl)azo)-, sodium salt; Azo Dye Intermediate 7357-71-3; 6-Hydroxy-5-((2-methyl-4-((2-methylphenyl)azo)phenyl)azo)-2-naphthalenesulfonic acid sodium salt
EINECS	Contact for details

Quality Control

Our production of Sodium 6-Hydroxy-5-[[4-(o-Tolylazo)-o-Tolyl]Azo]Naphthalene-2-Sulphonate adheres to stringent quality protocols to ensure batch-to-batch consistency and purity for industrial synthesis. Our products undergo rigorous quality testing to ensure compliance with industry standards. Certificates of Analysis (COA) are available upon request, detailing key parameters such as assay, impurity profile, and solubility.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, 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 performance and handling.

Specification

Item	Specification
Appearance	Orange to brown powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
Solubility (in Water)	Clear solution
Heavy Metals (as Pb)	≤ 20 ppm

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