Direct Red 187
Name:C.I.Direct Red 187,C.I.40275
Molecular Structure: Azo,Stilbene
C.I.Direct Red 187,C.I.40275,CAS 1325-64-0,Cuproxon Red BL
Molecular Formula:
Molecular Weight:
CAS Registry Number: 1325-64-0
Manufacturing Methods : in reflux (or a little take pressure), under the condition of sodium hydroxide solution in (E)-2-(2-sulfo-4-nitrostyryl)-5-nitrobenzenesulfonic acid and 3-Sulfo-5-aminosalicylic acid diazo, and 2-Amino-4-methylanisole coupled to a heating products.
Properties and Applications: yellow light red. Moderate soluble in water for orange brown, not soluble in alcohol. The strong sulfuric acid for blue-black, diluted for ash brown. The dye solution to join strong hydrochloric acid have dark brown precipitation; Add thick sodium hydroxide solution has the purple precipitation.
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
| Fading | Stain | Fading | Stain | ||||
| ISO | 3 | 2 | 5-6 | 3 | 3 | ||
List of Suppliers:
Cuproxon Red BL( CBW Chemie GmbH Bitterfeld-Wolfen )