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Foam board is made of a polystyrene foam core. It is sandwiched between two clay-coated papers. Their thickness typically ranges from 3/16″ to 1/2″. However, you can get even thicker.
It is one of the most common types of signage, and you may have seen it several times in schools or at the store. Two different names are used, foam boards and foam core boards; however, they are sometimes used interchangeably.