THERMOFORM Concrete formliners are rigid plastic liners that are used to achieve detailed patterns and textured concrete surfaces for precast architectural concrete. You may select from a variety of patterns, or custom order to fit your needs – at only a nominal additional cost. All patterns are available in two ranges: Single Use and Medium Reuse. The Single Use, made from styrene, is ideal where the formliner will be used only once. The Medium Reuse, can be used up to 10 times.