Yellow Color Paste — Iron Oxide / Organic Yellow (Universal UPR/Epoxy)

Yellow Color Paste is a pre-dispersed yellow pigment in a compatible resin carrier, available in iron oxide yellow (CI Pigment Yellow 42, CAS 51274-00-1, FeOOH-based) and organic yellow (isoindoline PY139, benzimidazolone PY154, or azo PY74) grades for thermoset resin systems. Iron oxide yellow provides durable, heat-stable yellow coloration for industrial and construction composites; organic yellow grades provide higher chroma and brightness for decorative and automotive applications.

Iron oxide yellow (goethite, FeOOH) is the workhorse pigment for yellow gelcoats in industrial tank linings, outdoor FRP panels, and construction products. It has excellent outdoor fastness (Lightfastness 7), is heat-stable up to 177°C (above which it dehydrates to red iron oxide), and is non-toxic. In yellow safety-colored fiberglass pipe, tank, and vessel insulation, iron oxide yellow provides the required visible color coding without UV fading. The relatively low chroma of iron oxide yellow (muddier, earthier tone) is acceptable for industrial applications but not for vivid decorative uses.

Organic yellow grades (PY139 isoindoline, PY154 benzimidazolone) provide high chroma, clean yellow hue similar to Pantone 102 or RAL 1016, suitable for decorative panels, sports equipment, and consumer products. These grades require adequate UV stabilization (HALS + benzotriazole) for outdoor use. PY139 and PY154 are among the more lightfast organic yellows available, providing 5–8 years outdoor service with full UV stabilization. Monoazo yellows (PY74) are less expensive but have lower lightfastness (3–4 outdoors) and are not recommended for UV-exposed applications.