5001-72-9

Basic information

• Product Name: Direct Red 31
• Synonyms: disodium 7,7'-iminobis[4-hydroxy-3-(phenylazo)naphthalene-2-sulphonate];Direct Pink 12B;2-Naphthalenesulfonic acid, 7,7-iminobis4-hydroxy-3-(phenylazo)-, disodium salt;7,7'-iminobis[4-hydroxy-3-(phenylazo)-2-naphthalenesulfonic aci disodium sa;Benzo Rhoduline Red B;C.I. Direct red 31;C.I.Direct Red 31(29100);Chloramine Rose B,Pyrazol Pink 2B
• CAS NO: 5001-72-9
• Molecular Formula: C32H21N5Na2O8S2
• Molecular Weight: 713.64738
• EINECS: 225-669-8
• Product Categories: Dyes and Pigments;Organics
• Mol File: 5001-72-9.mol
• Article Data: 0

Chemical Properties

• Appearance: /
• CAS DataBase Reference: Direct Red 31(CAS DataBase Reference)
• NIST Chemistry Reference: Direct Red 31(5001-72-9)
• EPA Substance Registry System: Direct Red 31(5001-72-9)

Safety Data

• Hazardous Substances Data: 5001-72-9(Hazardous Substances Data)

Usage

Description

Direct Red 31 is a synthetic azo dye characterized by its resistance to acids and alkalis, light fastness, and ability to produce stains and fading effects. It is commonly used in various industries for coloring and staining purposes.

Uses

Used in Textile Industry:
Direct Red 31 is used as a coloring agent for dyeing and printing textiles. Its acid and alkali resistance properties make it suitable for use in various dyeing processes, while its light fastness ensures the color remains vibrant even after exposure to sunlight.
Used in Leather Industry:
Direct Red 31 is used as a staining agent for leather products. Its ability to produce stains and fading effects allows for the creation of unique and visually appealing patterns on leather surfaces.
Used in Paper Industry:
Direct Red 31 is used as a coloring agent for paper and paper products. Its resistance to acids and alkalis makes it suitable for use in various paper manufacturing processes, while its light fastness ensures the color remains consistent over time.
Used in Cosmetics Industry:
Direct Red 31 is used as a coloring agent in the cosmetics industry, particularly in the formulation of lipsticks, blushes, and other makeup products. Its acid and alkali resistance properties ensure the color remains stable and vibrant throughout the product's shelf life.
Used in Food Industry:
Direct Red 31 is used as a coloring agent in the food industry, particularly in the production of confectionery, beverages, and other food products. Its ability to produce stains and fading effects allows for the creation of visually appealing products, while its acid and alkali resistance properties ensure the color remains consistent during processing and storage.
Used in Analytical Chemistry:
Direct Red 31 is used as an indicator in various analytical chemistry applications, such as the determination of metal ions and pH measurements. Its color changes in response to changes in pH or the presence of specific metal ions, making it a useful tool for qualitative and quantitative analysis.
Overall, Direct Red 31 is a versatile dye with a wide range of applications across different industries, thanks to its unique properties and characteristics.

Standard

Acid Resistance

Fading

Stain

ISO

3-4

AATCC

3-4

InChI:InChI=1/C32H23N5O8S2.2Na/c38-31-25-13-11-23(15-19(25)17-27(46(40,41)42)29(31)36-34-21-7-3-1-4-8-21)33-24-12-14-26-20(16-24)18-28(47(43,44)45)30(32(26)39)37-35-22-9-5-2-6-10-22;;/h1-18,33-35H,(H,40,41,42)(H,43,44,45);;/q;2*+1/p-2/b36-29-,37-30-;;