Black Color Paste — Carbon Black in UPR/Epoxy (Universal)

Black Color Paste is a pre-dispersed carbon black (CAS 1333-86-4) pigment in a compatible resin carrier, formulated for direct addition to unsaturated polyester, vinyl ester, and epoxy resin systems to provide deep black coloration. Carbon black is the standard black pigment for composite resins due to its excellent UV absorption, heat stability, chemical resistance, and cost-effectiveness. The pre-dispersed paste format ensures consistent color strength and jetness without the dust, handling hazards, and dispersion difficulties associated with dry carbon black powder.

Carbon black pigments have an extremely fine primary particle size (10–80 nm depending on grade), creating a high surface area material that is notoriously difficult to disperse uniformly in resins without specialized milling equipment. The color paste pre-dispersion eliminates this difficulty — the carbon black is already milled to fineness (Hegman 6–7) and stabilized in the carrier resin with a polymeric dispersant. This provides consistent jetness (bluish-black undertone characteristic of high-quality carbon black), color strength, and UV absorption in the cured part.

Black carbon black pastes are used in black gelcoat formulations for marine decks, automotive body panels, and industrial equipment housings. In carbon fiber composite applications where cosmetic appearance requires a uniform black appearance, black carbon black pigment is added to the matrix resin to mask fiber pattern and surface texture variation. Carbon black also provides antistatic properties at higher loading (>2% carbon black in the cured resin), which is useful in electronic enclosure applications.