Pigment Red 166(UN8158 Cromophtal Scarlet R ) Chemical Name:Disazo Scarlet; Cromophtal Scarlet R CAS No.: 3905-19-9 EU No.: 223-460-6 C.I. NO.: 20730 Chemical Formula: C40H24Cl4N6O4 Molecular Weight: 794.50 Physical and Chemical Properties of Pigment Red 166 PH Value: 6.7 Density (g/cm3 ): 1.5 Oil Absorption (ml/100g): 50 Light: 8 Heat (°C): 250 Water: 5 Linseed Oil: 5 Acid: 5 Alkali: 5 Application of Pigment Red 166:Plastic,paint,textile printing