OC™ – 303 is a low viscosity, medium reactivity, non pre accelerated, non thixotropic unsaturated polyester resin based on Orthophthalic acid. It is a quick curing unsaturated polyester resin suitable for hand lay up. This resin has good clarity and improved wettability with fiberglass. Due to its special stabilization OC™ – 303 is mainly intended to manufacture roofing sheets, corrugated sheets, etc.