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 T-20 resin is a low viscosity, promoted, thixotropic, version. It exhibits excellent wet-out properties and low drainage when applied to vertical surfaces. This resin is formulated to contain 35% styrene.

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.