4,4

4,4"-Diamino-2,2'-Stilbenedisulfonic Acid CAS#81-11-8

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High Reactivity as an Intermediate: Serves as a key intermediate in the production of fluorescent whitening agents and optical brighteners, ensuring efficient downstream synthesis.

Excellent Water Solubility: The presence of sulfonic acid groups provides strong water solubility, facilitating easy processing and formulation.

Functional Chemical Structure: Contains both amino and sulfonic acid groups on a stilbene backbone, enabling versatile chemical modifications and high performance in dye synthesis.

Wide Industrial Application: Widely used in textile and paper industries, supporting the production of high-quality dyes and brightening agents.
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Product Description

Melting point300 °C
Density1.4732 (rough estimate)
Vapor pressure1.3hPa at 25℃
Refractive index1.6510 (estimate)
Storage tempKeep in dark place,Inert atmosphere,Room temperature
SolubilityAqueous Base (Slightly)
Pka-1.58±0.50(Predicted)
FormCrystalline Powder
ColorCream to yellow-brown
Water Solubility<0.1 g/100 mL at 23 ºC
Merck14595
BRN629516
StabilityStable. Combustible. Incompatible with iron, strong oxidizing agents.
LogP-1.7--1.42 at 25℃
CAS DataBase Reference81-11-8(CAS DataBase Reference)
EPA Substance Registry SystemAmsonic acid (81-11-8)

Safety Information

Hazard CodesC,Xn
Risk Statements34-22-36/37/38-20/21/22
Safety Statements24/25-45-36/37/39-26-22
RIDADRUN 2583
RTECSWJ6603000
TSCAYes
HS Code29215900
Hazardous Substances Data81-11-8(Hazardous Substances Data)


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