Pigment Yellow 191

The color shade of Pigment Yellow 191 is similar to that of PY83, with better heat resistance but with low coloring power. The heat resistance of PY 191  in high-density polyethylene (HDPE, 1/3 Standard depth) is 300℃, and there is no dimensional deformation. It has good light fastness (level 7-8).In PVC application, It also has excellent migration.In  polycarbonate application, the temperature resistance is up to 330°C. And in United States, it is mainly applied for the coloring of traffic paint.

Product Details


Pigment Yellow 191 is reddish shade yellow powder, and suitable for the coloring of plastics.Its heat stability in HDPE is 290 degree. It also has excellent opacity and migration resistance, and is widely applied in ABS and PVC products. PY191 is eco friendly and halogen free pigments.

Chemical information 

Color Index No: Pigment Yellow 191

Synonyms:Pigment Brilliant HGR; Pyrazolone Yellow HGR; 4-chloro-2-4,5-dihydro-3-methyl-5-oxo-1-(3-sulfophenyl)-1H-pyrazol-4-ylazo-5-methyl-, calcium salt (1:1)

Molecular Structure:

Pigment Yellow 191 molecular

Molecular Formula:C17H13CaClN4O7S2 Molecular Weight:524.97
CAS No:129423-54-7 EINECS No:403-530-4
Density(g/cm3):1.75 Particle size:300um
Specific surface(m2/g):20 Oil Absorption(g/100g):45-55
Melting point:N/A Chemical Class:Monoazo Yellow, Ca salt

Chemical resistance datas

Light fastness (Full) : 6-8 Light fastness(Tinting) : 6-7
DOP:   5 Ethanol : 5
Heat stability (10min) :300℃ Ethyl acetate : 5
Acid: 3 Alkali : 5
White spirit:5 Weather:3


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: △

▲Very suitable    ◭Suitable   Δ Limited suitable    -Not suitable

Packing methods

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