Benzimidazolone Yellow Pigment

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Benzimidazolone Yellow is a high-performance green shade yellow benzimidazolone pigment, designed to have improved weatherfastness and higher tint strength than pre-existing Pigment Yellow 151 grades.

Benzimidazolone Yellow is a high-performance green shade yellow azo pigment designed to have improved weatherfastness and higher tint strength than pre-existing Pigment Yellow 151 grades. It has good gloss retention, tinting strength, and enhanced outdoor durability. It is considered a coloristic match with better weather resistance and the highest chroma compared to competitive grades. This yellow azo pigment has been registered according to the REACH regulation. It is on the following chemical inventories: US TSCA, EU, Japan, Australia, Korea, China, Canada, Philippines, New Zealand, and Taiwan.

Pigment Information
Pigment Classification:Synthetic Organic
Colour Index:Pigment Yellow 151 (13980)
Chemical Name:Benzimidazolone (monoazo, acetoacetyl, H4G)
Chemical Formula:C18H15N5O5
Chemical Structure:Benzimidazolone Chemical Structure
CAS No.:31837-42-0
Series No.:4
ASTM Lightfastness
Physical Properties
Specific Surface:0.9 m2/g
Density:1.6 g/cm3
Bulk Volume:16 l/kg
Refractive Index:1.721
Oil Absorption:52 ml oil / 100 grams pigment
Health and SafetyNo acute or known chronic health hazards are associated with this product’s anticipated use (most chemicals are not thoroughly tested for chronic toxicity). Always protect yourself against potentially unknown chronic hazards of this and other chemical products by keeping them out of your body. Do this by avoiding ingestion, excessive skin contact, and inhaling spraying mists, sanding dust, and vapors from heating. Conforms to ASTM D-4236.

For a detailed explanation of the terms in the table above, please visit Composition and Permanence.

Origin and History

The first azo pigment, tartrazine yellow, PY100, still used in artists’ paints, was patented in 1884. β-naphthol azo pigments were introduced from 1895 to 1911 and are still in production. The first Hansa yellow, PY1, was patented in 1909, and the first diarylide was synthesized in 1911. Because their importation from Germany was forbidden during World War I, American manufacturers began to study azo dyes in depth. Benzimidazolone pigments were first prepared in 1960, the same year the diazo condensation pigments were introduced to the United States. Azo pigments have become the largest class of synthetic organic pigments because of their ease of preparation and wide range of colors.

Pigment Names
Common Names:

Aureolin (hue)
Aureolin Modern
Aureolin Yellow (hue)
Azo Yellow
Azo Yellow (Aureolin)
Benzimidazo H4G
Benzimidazo Yellow H4G (green shade)
Benzimidazolone Yellow
Canary Yellow
CI Pigment Yellow 151
DCC 7151 Benzimidazolone Yellow
Gafast Pigment Yellow 151
Hostaperm Yellow H4G
John Deere Yellow
Monoazo Yellow
Permanent Yellow Light
Pigment Yellow 151



Benzimidazolone pigments are monoazos containing benzimidazolone moiety as part of the coupling component. As the benzimidazolone ring of the coupling component imparts significant lightfastness, several pigments have been synthesized to provide a broad color range for this subclass. The acetoacetylarylamides range from greenish-yellow to orange, whereas the Naphthol AS types are red, carmine, violet, and brown.

Permanence and Compatibility

Benzimidazolone pigments have outstanding bleed resistance, lightfastness, and moderate heat resistance. The lightfastness of some benzimidazolones approaches that of quinacridones and phthalocyanine. Benzimidazolones also possess high heat stability (usually to 260°C, although some members of this class are stable only to 200°C); some are among the most heat-stable organic. The general structure of diazo condensation pigments: (a) yellow series and (b) brown, red, and violet series pigments. Benzimidazolones are used in artists’ paints, for coloring plastics, automotive coatings, and colored pencils and wood stains.

Oil Absorption and Grinding

Benzimidazolone yellow absorbs a large amount of oil—for every 100 grams of benzimidazolone yellow, 52 grams of linseed oil is needed to form a coherent paste, the oil absorption value for this pigment.


Benzimidazolone yellow is not considered toxic; however, care should be used in handling the dry powder pigment to avoid inhaling the dust. All toxicological studies showed no signs of toxicity to humans or the environment.

For more information on handling pigments, please visit How to Safely Handle Art Materials and Pigments.


Benzimidazolone yellow is not among organic pigments that contain inadvertent polychlorinated biphenyls (PCB) or dichlorobenzidine (DCB) compounds.

More Information
BrandRublev Colours
VendorNatural Pigments
Processing TimeUsually ships the next business day.
Pigment TypeOrganic, Synthetic
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Benzimidazolone Yellow Pigment
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