Products name | Indigo(C.I Vat Blue 1#) | constitutional formula | | molecular formula | C16H10N2O2 | molecular weight | 262 | nature | This product is dark-blue uniform powdery or granular. It cannot be dissolved in water and common organic solvents such as ethanol and aether. Its melting point in the closed capillary is 390-392°C, and it begins sublimating slowly at 290°C. It has very good sunburn endurance and application performance. | test condition | HG/T 2750-1996 | appearance | dark-blue uniform powder or granule | (1) Original powder | content | %≥94.0 | particbe size(60mesh) | %≥96.0 | moisture | %≤1.0 | Fe3+ | <200PPM | (2) Pelleting | content | %≥94.0 | moisture | %≤1.0 | Fe3+ | <200PPM | (3) Promoter | content | %≥93.0 | moisture | %≤0.8 | Fe3+ | <200PPM | use | Reducing indigo to be dyestuff, which can be mainly used in dyeing cotton fabric, and otherwise can be made to 5.5'-7.7'- tetrabromo indigo, and then be used in biochemical and indicators, etc. | |