Description

Disodium 8-[[3-[(Ethylphenylamino)Sulphonyl]-4-Methylphenyl]Azo]-7-Hydroxynaphthalene-1,3-Disulphonate is a high-purity, water-soluble azo dye intermediate known for its excellent chromophore properties. This compound is critical for manufacturers requiring consistent, high-quality colorants with strong tinctorial strength and good solubility profiles. It is primarily utilized by producers of dyes and pigments for textiles, inks, and specialty coatings who demand reliable performance and batch-to-batch consistency.

Application

• Primary intermediate for the synthesis of acid dyes and direct dyes used in textile coloration, particularly for nylon, wool, and silk.
• Key precursor in manufacturing pigments for inks, including those used in packaging and commercial printing.
• Used in the production of specialty colorants for leather and other natural substrates.
• Component in the formulation of functional dyes for non-textile applications, such as paper and detergents.
• Research and development chemical for novel azo-based chromophores in advanced material science.
• Potential use in the synthesis of dye-sensitized materials for photochemical applications.

Basic Information

Product Name	Disodium 8-[[3-[(Ethylphenylamino)Sulphonyl]-4-Methylphenyl]Azo]-7-Hydroxynaphthalene-1,3-Disulphonate
CAS No.	68214-56-2
Molecular Formula	C25H21N3Na2O9S3
Molecular Weight	665.61 g/mol
Synonyms	Acid Red 337 (C.I. 17200); Disodium 8-[[3-[(ethylphenylamino)sulfonyl]-4-methylphenyl]azo]-7-hydroxynaphthalene-1,3-disulfonate; C.I. Acid Red 337; 8-[[3-[(Ethylphenylamino)sulfonyl]-4-methylphenyl]azo]-7-hydroxynaphthalene-1,3-disulfonic acid disodium salt; Ethylphenylamino Azo Naphthol Disulfonate; Azo dye intermediate 68214-56-2; 1,3-Naphthalenedisulfonic acid, 8-[[3-[(ethylphenylamino)sulfonyl]-4-methylphenyl]azo]-7-hydroxy-, disodium salt
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality management systems to ensure it meets the high standards required for industrial synthesis. Every batch is tested using advanced analytical techniques, including HPLC and spectrophotometry, to confirm identity, purity, and chromatic properties. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical specifications is provided with each shipment to guarantee traceability and performance consistency for your manufacturing processes.

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 (moisture-sensitive) nature, the container must be kept sealed when not in use to prevent absorption of atmospheric moisture, which can affect product performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Sulfated Ash	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Clear solution
λmax (Visible Spectra)	Contact for details

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