slip sheet

Noun

 * 1)  Sheet material, such as reinforced kraft paper, rosin-sized paper, polyester scrim or polyethylene sheeting, placed between two components of a roof assembly to ensure that no adhesion occurs between them and to prevent possible damage from chemical incompatibility, wearing or abrasion of the membrane.
 * 2)  A strong, thin pallet-sized sheet of plastic or fiberboard used to transport heavy items.
 * 3)  A sheet inserted between freshly printed pages to prevent them from sticking together.