Pigment Red 81

Pigment Red 81 is a red powder pigment with bluish shade. with bright color and high tinting power, which meets the standard red used in four-color plate inks. It has low solvent resistance in alcohols, ketones and esters or their mixtures, but is more stable in solvents such as aromatic hydrocarbons and paraffin wax. Light resistance: Level 5, heat resistance: 120°C. In the ink, it presents a bright red that is difficult to replace with other pigments.

Product Details

Basic information of Pigment Red 81 :

Color Index No: Pigment Red 81

Synonymum:Fast Pink Lake G; C.I. Pigment Red 81;  Pigment Fast Pink Toner,FAST PINK TONER;

Molecular Structure:

Pigment Red 81 molecular

Molecular Formula:C28H31N2O3 CAS No:12224-98-5
Molecular Weight:2262.9919 EINECS No:235-424-7
Density(g/cm3):1.85 Average particle size(nm):120
Specific surface(m2/g):60 Oil Absorption(g/100g):45-55
Melting point:N/A ChemicalClass:Triarylcarbonium,

PTMA type

Chemical resistance datas:

Light fastness (Full) : 4 Ethanol : 2-3
Light fastness(tinting) : 3-4 Acid :4
Heat stability (10min) : <140℃ Toluene : 3-4
Ethyl acetate : 3 Alkali : 4-5
Water : 4 Paraffine : 4-5

Feature of Pigment Red 81 :

1.Pigment Red 81 is pure bluish red powder and it is semi-transparent.

2.The color shade of Pigment Red 81 is suitable for the printing ink, and is mainly used in printing ink and coloring of stationary.

3.Pigment Red 81 is poor in solvent resistance, such as Alcohols, ketones and esters

4.Pigment Red 81 is relatively stable in paraffin and aromatics

5.In concentrated sulfuric acid, Pigment Red 81 will turn yellow, andif diluted,it is red.  And if the aqueous solution meets sodium hydroxide it will be red precipitate

Application of Pigment Red 81 :

Water based ink, cold set ink, sheet fed ink, NC ink, UV curing(offset and flexo ink),PA ink