3132 Big Pink [English name] 3132-Fast Red; CIPigment Red 21 (12300) [structure or formula] [character] red powder. Issolved insoluble in water, oil, ethanol and paraffin. [Use] is a widely used azo red pigment. Mainly for paint, ink, leather, latex products, inks, cosmetics, stationery and coloring. Preparation or sources] was by diazotization after naphthol AS coupling and the. [Other] have excellent acid, alkali, light fastness properties. Properties (Physical Properties) 1, Shade (with standard): Approximate ~ micro; 2, tinting strength (as standard): 95-105%; 3, moisture: ≤1.5%; 4, water soluble matter: ≤1.5 %; 5, oil absorption: 30-40%; 6, sieve residue (20 mesh): ≤5%; 7, light resistance: ≥6 level; 8, heat resistance: 120 ℃