High Quality of Direct Red 28 CAS 573-58-0 C. I. 22120

• CAS No.: 573-58-0
• Formula: C32h22n6na2o6s2
• EINECS: 209-358-4
• Classification: Polycyclic Aromatic Hydrocarbons
• Shape: Powdery
• Grade Standard: Industrial Grade
• Model NO.: SUREST-110
• Source: Arene Separation
• Shelf Life: 2 Years
• Stock: Available
• Molecular Weight: 696.66
• Water Solubility: Soluble
• Color: Brownish Red
• Melting Point: 360 ºC
• Transport Package: 25kg or 200 Kg/Barrel
• Specification: 98%min
• Trademark: Surest
• Origin: China
• HS Code: 3204140000
• Production Capacity: 1000 Tons Yearly

Product Description

Direct Red 28
 

Name	Direct Red 28
Synonyms	C.I. 22120; Disodium 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis(4-aminonaphthalene-1-sulphonate)
Molecular Structure
Molecular Formula	C32H22N6Na2O6S2
Molecular Weight	696.66
CAS Registry Number	573-58-0
EINECS	209-358-4

Properties

Melting point	360 ºC
Water solubility	soluble

Chemical Property/Description

It is a brown-red powder, yellow-red in water and orange in alcohol.

Main Uses:

Used widely in cotton; The dyeing of viscose, because it is easy to turn blue in the face of acid, and there is no appropriate treatment method to improve its wet treatment fastness, so since the advent of insoluble azo dyes and direct acid-resistant red 4BS, the use of this product in dyeing has been decreasing, but the amount is quite large in the paper industry.

It can also be used as an acid-base indicator, that is, Congo red test paper, pH3.5 (blue purple) -5.2 (red). In addition, it is also used for biological staining and analytical reagents.

Used as an adsorption indicator for the determination of halides, thiocyanates and zinc. It is used as a color developing agent for determination of thiophosphate herbicide by thin layer chromatography.

It is also used as a biological stain.