Pigment Red 166

Pigment Red 166 is a very bright red pigment. The color strength of PR166 is not that good, but its hear stability is excellent in polyolefin. In HDPE, its heat resistance can reach 300℃/5min. PR166 also has excellent light fastness and it can reach grade 8 in transparent HDPE. However, its weather fastness is not suitable for the products that need to be outside for long time. it is suitable in the coloring of  polystyrene, polyacrylonitrile, and rubber. It is also recommended for high end industrial coating, package ink and metal decorative ink.

Product Details


Pigment Red 166 is general use red pigment. It has excellent heat resistance in plastics and good stability. It also has outstanding migration resistance and light fastness. It performs well in acid and alkali condition.

Chemical information 

Color Index No:C.I.20730

Synonyms:Cromophtal Scarlet R,  2-Naphthalenecarboxamide,N,N’-1,4-phenylenebis[4-[(2,5-dichlorophenyl)azo]-3-hydroxy-

Molecular Structure:

Pigment Red 166 molecular

Molecular Formula:C40H24Cl4N6O4 Molecular Weight:794.468
CAS No:3905-19-9/71819-52-8 Average Particle Size(um):
Density(g/cm3):1.57 EINECS No:223-460-6
Oil Absorption(g/100g):55 Specific surface(m2/g):26
Chemical Class:Disazo Melting point(/℃):340

Chemical resistance datas

Light fastness (Full) : 7-8 Light fastness(Tinting) : 7
Ethyl acetate:  5 Ethanol : 5
Heat stability (10min) :200 DOP:5
Acid: 5 Alkali : 5
Migration:5 Weather:4


Ink 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