Description

4,4'-Bis[(4-Ethoxyphenyl)Azo]Stilbene-2,2'-Disulphonic Acid is a high-purity, synthetic organic compound belonging to the class of azo dyes and stilbene derivatives. This chemical is valued for its strong chromophoric properties and its role as a key intermediate in the synthesis of specialized colorants and optical brightening agents. It is primarily sought by manufacturers in the dyes and pigments, textile processing, plastics, and specialty chemical synthesis industries for developing products with enhanced color fastness and fluorescence.

Application

• Optical Brightening Agent (OBA) Intermediate: A critical precursor in the manufacture of stilbene-based fluorescent whitening agents used in paper, textiles, and detergents.
• Dye and Pigment Synthesis: Serves as a key intermediate for producing high-value azo dyes, particularly for applications requiring yellow to orange hues with good light stability.
• Textile Industry: Used in the formulation of specialty dyes and finishes to enhance the brightness and whiteness of synthetic and natural fibers.
• Polymer and Plastics Additive: Incorporated into polymer matrices to impart specific optical properties or as a marker/tracer in material science research.
• Analytical Chemistry: Potential use as a chromogenic reagent or standard in spectrophotometric analysis and research.
• Specialty Chemical Manufacturing: Employed as a building block for synthesizing more complex molecules in pharmaceutical and agrochemical research.

Basic Information

Item	Detail
Product Name	4,4'-Bis[(4-Ethoxyphenyl)Azo]Stilbene-2,2'-Disulphonic Acid
CAS No.	10359-84-9
Molecular Formula	C30H28N4O8S2
Molecular Weight	636.70 g/mol
Synonyms	4,4'-Bis[(4-Ethoxyphenyl)azo]stilbene-2,2'-disulfonic acid; 2,2'-(1,2-Ethenediyl)bis[5-[(4-ethoxyphenyl)azo]benzenesulfonic acid]; Fluorescent Brightener ER; Tinopal ER; Stilbene Brightener; Azo Stilbene Disulfonic Acid Derivative; 4,4'-Bis(4-ethoxyphenylazo)stilbene-2,2'-disulphonic acid; CI 40622
EINECS	Contact for details

Quality Control

Our production of 4,4'-Bis[(4-Ethoxyphenyl)Azo]Stilbene-2,2'-Disulphonic Acid adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity, spectrophotometry for color value, and identification via IR and NMR, to ensure it meets precise customer specifications and industry benchmarks. Certificates of Analysis (COA) documenting all critical parameters are provided as standard to guarantee traceability and supply chain integrity.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at controlled room temperature (15-25°C). Keep away from strong oxidizing agents and incompatible materials. Due to its complex organic structure, prolonged exposure to elevated temperatures or humidity should be avoided to maintain product stability.

Specification

Item	Specification
Appearance	Yellow to orange powder or crystalline solid
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 95.0% (Typical 97-99%)
Loss on Drying	≤ 2.0 %
Sulfated Ash	≤ 0.5 %
Heavy Metals (as Pb)	≤ 20 ppm
Absorbance (λ max)	Conforms to reference

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