HETRON FR 650 Series resins are flame retardant polyester resins. Composites made with HETRON FR 650 Series resins have been tested and have achieved a Class 1 Flame Spread per ASTM E-84 without addition of synergists such as antimony trioxide.

HETRON FR 650 INF-20 resin is a low viscosity promoted resin optimized for the infusion process. This grade may also be used for resin transfer molding. It exhibits excellent glass wet out properties.

APPLICATIONS AND USE
HETRON FR 650 Series resins, depending on the grade selected, can be used in hand lay-up, spray-up, filament winding and infused flame retardant applications. Markets include architectural, mass transit, passenger rail, electrical and mine ducting.