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


Pigment Red 81 is pure bluish red powder and it is semi-transparent. The color shade of PR81 is suitable for the printing ink, and is mainly used in printing ink and coloring of stationary. PR81 is poor in solvent resistance, such as Alcohols, ketones and esters. It is relatively stable in paraffin and aromatics. In concentrated sulfuric acid, PR 81 will turn yellow, and if diluted, it is red. And if the aqueous solution meets sodium hydroxide it will be red precipitate

Chemical information

Color Index No: Pigment Red 81

Synonymum:Fast Pink Lake G;  Pigment 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



Sheetfed offset ink: ▲ Water-based ink: ▲
Heat set ink: △ NC ink: △
Cold set ink: ▲ Metal decorative ink: –
Gravure ink: – UV curing ink(offset): ◭
Silkscreen ink: – UV curing ink(Flexo): ◭
Coating Water based industrial paint: – Powder Coatings: –
Solvent based industrial paint: – Automotive coatings: –
Water based decorative paint : – Wood coatings: –
Solvent based decorative paint: – Amine curing epoxy coatings: –
Coil Coating: – Textile printing: –
Plastic PE: – PA: –
PP: – PC: –
PVC: – Pom: –
ABS: – Rubber: –
PUR: – Fibers: –

Packing methods

25kgs craft bag with pallets; 7-8MT in 20’FCL