Description

Sodium 3-[(4-Amino-2,5-dimethoxyphenyl)azo]-4-hydroxybenzenesulphonate is a high-purity azo dye intermediate widely used in the synthesis of specialized dyes and functional colorants. It serves as a critical building block for developing lightfast, pH-responsive, and metal-complexable dyes with precise spectral properties. This compound is essential for manufacturers in the textile, inkjet ink, analytical reagent, and specialty polymer industries requiring reproducible chromophore performance under controlled processing conditions. Sodium 3-[(4-Amino-2,5-Dimethoxyphenyl)Azo]-4-Hydroxybenzenesulphonate CAS NO 85895-90-5 delivers consistent batch-to-batch quality for R&D and scale-up applications.

Application

• Intermediate for synthesizing acid and metal-complex dyes for wool, silk, and nylon dyeing
• Chromogenic component in pH-indicating analytical reagents and diagnostic test strips
• Functional dopant in electrochromic polymers and smart window coatings
• Key precursor for high-performance disperse dyes used in polyester digital textile printing
• Research-grade material for studying azo-hydrazone tautomerism and photoisomerization kinetics
• Building block in the development of bioconjugatable dyes for life science labeling

Basic Information

Product Name	Sodium 3-[(4-Amino-2,5-dimethoxyphenyl)azo]-4-hydroxybenzenesulphonate
CAS No.	85895-90-5
Molecular Formula	C15H15N3O7SNa
Molecular Weight	403.36 g/mol
Synonyms	Acid Red 296; C.I. Acid Red 296; Sodium 4-amino-3-[(2,5-dimethoxy-4-phenylazo)phenyl]sulfonate; 4-[(4-Amino-2,5-dimethoxyphenyl)azo]benzene-1,3-disulfonic acid, monosodium salt; Sodium 3-[(4-amino-2,5-dimethoxyphenyl)azo]-4-hydroxybenzenesulfonate; NSC 62542; Dye Intermediate AR-296; 3-[(4-Amino-2,5-dimethoxyphenyl)azo]-4-hydroxybenzenesulphonic acid sodium salt
EINECS	284-592-0

Quality Control

Our products undergo rigorous quality testing to ensure compliance with industry standards. Certificates of Analysis (COA) are available upon request. All batches conform to stringent purity and impurity profile requirements aligned with ACS Reagent Grade specifications for dye intermediates. Testing includes identity confirmation (IR, HPLC), assay quantification, heavy metals screening (<10 ppm), residual solvent analysis, and water content determination — all performed in ISO/IEC 17025-accredited laboratories.

Storage

Preserve in a tightly closed container, protected from light. Store at 15–25°C in a dry, well-ventilated area. Due to its hygroscopic nature, minimize exposure to ambient humidity and avoid repeated opening of the container. Keep away from strong oxidizing agents and incompatible materials such as strong acids or alkalis.

Specification

Item	Specification
Appearance	Red to reddish-brown crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.5%
Loss on drying	≤ 1.5%
Heavy metals (as Pb)	≤ 10 ppm
Residue on ignition	≤ 0.5%
Water content (Karl Fischer)	≤ 1.2%

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