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Corriboard is a popular, lightweight, waterproof polypropylene sheet product used in general sign making. In white and in heavier grades, this sheet is used for election posters. It is waterproof and and provides an excellent robust form of signage for both indoor and outdoor event signage. The sheet can be printed directly, or alternatively is ideal for the application of plotter graphics. Orange corriplast is often used by civil contractors in temporary road signage and directional signs.