HC300 is constructed from a polyester resin with glass filament reinforcement. Flexible polyester additive claims increased toughness, and thin wall cross-sections without fracture. The material is claimed to be less rigid than 100% epoxy composites and compliant for most applications. In addition, polyester resin compliancy saves a claimed 35% on costs associated with mill bit replacement, as compared to typical epoxy resin materials.
 
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