HFS (R PTFE Film No Adhesive, Pure White 16 x 60 inch ; Thickness 0.35mm ; 60inch Long/Roll ; Cut to Any Size; 1 roll of 60"x16" Sheet Line your HFS oven shelves with these sheets for easy and quick clean-up. Silicone can absorb solvents, not allowing them to release during vacuum heating, but PTFE is 100% resistant to absorption. Thichness 0.0135 inch, 0.35mm easy to cut any sizes you need