Air Release Additive for Epoxy Resin Systems

Air Release Additive for Epoxy Resin Systems is a specialized defoaming and air-release agent formulated for use in epoxy casting resins, infusion epoxies, and potting compounds where entrained air must be eliminated before and during cure. Epoxy resins are typically higher in viscosity than UPR systems and have longer cure windows, which can allow air bubbles to become trapped and stabilized by the increasing viscosity before they can rise to the surface. This is critical in optically clear casting applications, electrical potting, and structural infusion composites where void content directly affects performance.

Epoxy-compatible air release additives function at the bubble-liquid interface by reducing the dynamic surface tension of the epoxy system, allowing micro-bubbles to coalesce into larger bubbles that rise more rapidly through the resin mass before gelation. Unlike UPR systems where cure is rapid, epoxy systems benefit from extended low-viscosity hold times during room-temperature cure or elevated-temperature pre-gel stages that allow air release to proceed more completely.

For clear epoxy systems (river tables, art resin, optical casting), air release agents must be optically compatible — non-turbid, non-clouding, and non-yellowing. Specially purified organic ester or modified acrylic additives provide effective air release without optical effects. For high-performance structural epoxy infusion (wind blades, marine hulls, aerospace), the additive must not affect mechanical properties, resin viscosity profile, or pot life beyond acceptable limits. Separate optimized grades exist for low-viscosity infusion resins and high-viscosity casting systems.