Pigment Red 8

Pigment Red 8(Permanent Red F4R) is a pure blue red pigment powder. It has bright shade and high tinting strength. It is mainly applied in coloring of water based inks and water-based printing pastes. The transparent type may recrystallize in packaging printing inks and this affects the transparency and color power. But PR8 is sensitive to sterilization treatment and varnish and its heat resistance is 140℃/30min. This pigment is also used for printing on fabrics that needs low light fastness.

Product Details


Pigment Red 8 is bright red powder with bluish shade. It is easy to be dispersed and has good fastness to bleed.It has good acid resistance but poor alkali resistance. I alkali, it can only keep 20mins at 150 degree. In concentrated sulfuric acid, PR 8 is light yellow red and after dilution, it will become a red precipate.It will become bright and blue red in concentrated nitric acid

Chemical information 

Color Index No: Pigment Red 8

Synonymum:Pigment Permanent Red F4R,N-(4-chlorophenyl)-3-hydroxy-4-[(2-methyl-5-nitrophenyl)azo]naphthalene-2-carboxamide, n-(4-chlorophenyl)-3-hydroxy-4-[(2-methyl-5-nitrophenyl)azo]-2-naphthalenecarboxamide,2-Naphthalenecarboxamide,N-(4-chlorophenyl)-3-hydroxy-4-(2-methyl-5-nitrophenyl)azo

Molecular Structure:

Pigment Red 8 molecular

Molecular Formular: C24H17ClN4O4 CAS No: 6410-30-6
Molecular Weight: 460.87 EINECS No: 229-100-4
Density(g/cm3): 1.45 Average particle size(nm): 200
Specific surface(m2/g): 40-50 Oil Absorption(g/100g): 40-50
Melting point: 305℃ Chemical Class: Naphthol AS

Chemical resistance datas

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