Patent ID: 8097331

Claim:
A mold release sheet disposed between a mold and a material to be molded, the mold release sheet comprising expanded graphite, characterized in that: the N 2 gas permeability represented by the following equation (1) is from 5.0×10 −7 cm 2 /s to 1.0×10 −4 cm 2 /s, N 2 Gas permeability= Q·L /(Δ P·A ), (1) where Q is the gas flow rate (Pa·cm 3 /s), ΔP is the pressure difference (Pa) between two chambers, A is the gas transmission area (cm 2 ) of the mold release sheet, which is the area of a passage that allows the two chambers to communicate with each other, and L is the thickness (cm) of the mold release sheet.