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

Red Color Paste is a pre-dispersed red pigment in a compatible resin carrier, available in iron oxide red (CI Pigment Red 101, CAS 1309-37-1) and organic red (perylene or azo red) grades for use in unsaturated polyester, vinyl ester, and epoxy resin systems. Iron oxide red provides durable, weather-resistant red coloration at low cost, suitable for industrial, construction, and architectural composite applications. Organic red grades (perylene PR179, azo PR112) provide higher chroma, brighter red hue, and lower specific gravity but at higher cost and with greater sensitivity to UV degradation in outdoor applications.

Iron oxide red pigments are preferred for applications exposed to outdoor weathering, heat (stability to >300°C), and chemical environments because of their exceptional durability and non-migration. In reinforced concrete repair mortars, epoxy floor coatings, and construction panel gelcoats, iron oxide red provides stable color without fading. In the composite industry, iron oxide red paste is used in red-tinted gelcoats for industrial tanks, marine fittings, and architectural cladding.

Organic red paste (perylene or quinacridone type) is chosen where high chroma and vivid red color is the priority and where UV stabilization can compensate for organic pigment's lower outdoor fastness. Automotive FRP parts, sports equipment composites, and decorative furniture panels in indoor or UV-stabilized applications use organic red paste for the best color aesthetics. The choice between iron oxide and organic red is primarily a trade-off between durability (iron oxide) and color brightness (organic).