HETRON FR 650 Series resins are flame retardant(1) 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-40 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%
HETRON FR 650 INF-40 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.