Pigment Yellow 191

Brand	Fineland Chem
Color Index	Pigment Yellow 191
Color Index No	18795
CAS No	129423-54-7
EC No	403-530-4
Chemical Group	Azo Lake
Chemical Formula	C₁₇H₁₃CaClN₄O₇S₂

Introduction

Pigment Yellow 191 (PY191) with heat resistance up to 300 °C in HDPE and 330 °C in polycarbonate, along with lightfastness of grade 7-8 and excellent migration resistance in PVC, Pigment Yellow 191 is a premium red-shade yellow pigment for high-end plastic applications.

Best Selling

PY191 – DuraPlast®HGR-2 ⬇️TDS

This is a reddish-yellow pigment with semi-transparent properties and good color strength, offering good dispersibility and thermal stability, suitable for plastic applications.

Physical Properties

Test Item	Specification
Density (g/cm3 )	1.7-1.8
Specific Surface Area(m2/g)	10-30
Oil Absorption(g/100g)	30-60
PH Value	5.0-7.5
Bulk Density (lb/gal)	3-5
Total impurities(ppm)≤	600

Fastness Properties

Heat Resistance (℃)	300	Alkali Resistance (1-5)	5
Light Resistance (Full Shade, 1-8)	7	Migration Resistance(1-5)	5
Light (Reduced tinting, 1-8)	6	Ethyl Acetate (1-5)	4
Weather Resistance (1-5)	4	Ethanol (1-5)	4
Acid Resistance (1-5)	5	MEK (1-5)	4

Application

Printing Ink: Discover high-performance ink pigments for various printing technologies including water-based, solvent-based, offset, inkjet, UV curing, and decorative applications. More Details

Paint and Coating: Explore a wide range of coating pigments tailored for paints, oils, automotive finishes, industrial applications, concrete, cement, and ceramics. More Details

Plastic and Masterbatch: Browse a comprehensive selection of plastic pigments designed for PE, PVC, EVA, rubber, and a variety of engineering plastics. More Details

Special Use: Find specialized pigments offering unique effects and functionalities for textiles, resins, glazes, metallic finishes, fluorescence, and anti-corrosion needs. More Details

Advantages

Excellent Heat Resistance
Pigment Yellow 191 demonstrates outstanding thermal stability, maintaining color integrity without deformation at 300 °C in HDPE and up to 330 °C in polycarbonate.
Superior Lightfastness
With a lightfastness grade of 7–8, it offers long-lasting color durability under UV exposure and outdoor conditions.
Outstanding Migration Resistance
In plasticized PVC, PY191 shows excellent anti-migration properties, ensuring stable color and appearance during long-term use.
Good Solvent and Chemical Resistance
The pigment resists solvents and chemical attack, maintaining its performance even in harsh processing environments.

Synonyms

Yellow KGR	Versal Yellow RL	Pyrazolone Yellow HGR	Yellow HGR 31
Plasco Yellow 191	CAS No.: 129423-54-7	Hostprint Yellow HGR 31	PV Fast Yellow HGR
Pigment Brilliant Yellow HGR	C.I. Pigment Yellow 191 (C.I. 18795)	Benzenesulfonic acid, 4-chloro-2-[[4,5-dihydro-3-methyl-5-oxo-1-(3-sulfophenyl)-1H-pyrazol-4-yl]azo]-5-methyl-, calcium salt (1:1)