Fiberglass Doors Uniflex is a supplier of FRP Doors, Frames and Accessories for Industrial / Commercial Applications such as Laboratories and Pharmaceutical, Food and Beverage, Chemical, Zoos and Aquariums, Pulp and Paper, Poultry, Utilities, Municipalities, Government, and many others. Our standard FRP Door sets the standards in the industry for tough, corrosion-resistant, fiberglass doors. Working closely with chemical manufacturers, Uniflex tailors the resin formula specifically to match the conditions where the door will be installed. Our unique one-piece stile and rail system provides our doors with outstanding strength and dimensional stability – no warping or bow racking, ever.