Methods of forming a ceramic component and a high temperature mold for use therewith are provided. The method includes providing a fixture having a receiving surface configured to receive an unfired ceramic component. The method includes applying a continuous high temperature membrane to a surface of the unfired ceramic component. The method includes covering the continuous high temperature membrane and unfired ceramic component with a high temperature loose media. The method includes heating the unfired ceramic component to a firing temperature. The high temperature mold includes the fixture and a support structure forming a compartment surrounding the fixture. The mold allows the high temperature loose media to be contained within the compartment and to cover the continuous high temperature membrane. The continuous high temperature membrane and high temperature loose media are evenly distributed over the uncured ceramic component and operable to provide constant pressure during processing using the mold.