slip sheet
noun1
Business, Construction, Manufacturing, Roofing 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.
3
Media, Printing, Publishing A sheet inserted between freshly printed pages to prevent them from sticking together.