| 摘要 |
[Problems] An object is to provide a mold release sheet, made of expanded graphite, that can achieve high product quality and that can remarkably improve the work efficiency and production yield when silicon carbide, aluminum nitride, or the like is produced by compressing. [Means for Solving the Problems] A mold release sheet (4) disposed between silica powder M and an inner face of an outer member 1b of a mold and made of expanded graphite, characterized in that: the gas permeability represented by the following equation (1) is 1.0x10-4 cm2/s or less, Gas permeability=Q.L/(DeltaP.A), (1) where Q is the gas flow rate (Pa.cm3/s), DeltaP is the pressure difference (Pa) between two chambers, A is the gas transmission area (cm2) 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.
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