This specification and its supplementary detail specifications cover interleaf carrier materials in the form of polyethylene film or coated paper tape or sheeting.These products have been used typically to support uncured resin-impregnated, fiber-reinforced tape or broadgoods for composites during shipment, storage, handling, and layup, and to separate layers of the composite tape on reels, but usage is not limited to such applications. Perforated material is used for layup on sprocket-driven tape-laying machines.