Fiberglass Reinforced Polyester (FRP) Door and Aluminum Frame System The Fieldstone textured face sheets are .120” thick, class C(flame spread), with UV clear coat protection. The Fieldstone textured face sheets will never rust, crack or rot. The aluminum vertical edges used with this door construction are the same three colors, Anodized Black, Dark Bronze and Clear offered with the Pebble textured faces. Now Available Fire Rated and Hurricane Rated! The FRP Door System is a Fiberglass Reinforced Polyester door and aluminum frame intended primarily for exterior openings such as schools, restaurants, or any opening in high use and abuse areas. The hurricane rated FRP Door System is a Fiberglass Reinforced Polyester (FRP) door and aluminum frame that is resistant from hurricane force winds and debris. Perfect for anywhere a strong, light-weight opening is required to withstand abuse. The fire rated FRP Door complements our standard FRP door, but features a fire-resistant composite or mineral core that can be used in openings rated up to 90 minutes.