and the edges of the bag are sealed to the table top by suitable means such as tape the bag is equipped with an inlet tube such that the atmosphere within it may be withdrawn by connecting the inlet tube to a vacuum pump when vacuum pressure is applied to the inlet tube of the bag the bag collapses and exerts vacuum pressure against the lay up areas at least 22 34 of mercury vacuum should be maintained next the lay up table including all of the lay up areas and the vacuum bag are placed in an oven and cured at 350 u00b0 f u00b1 10 u00b0 f for 120 u00b1 10 minutes mercury vacuum should be maintained between 22 34 and 28 34 during this procedure finally the table vacuum bag and lay up areas are removed from the oven alternatively the lay up table and vacuum bag and lay up areas may be placed in an autoclave at room temperature while maintaining a vacuum pressure within the vaccum bag between 22 and 28 34 of mercury the pressure in the autoclave may be then raised to 45 psi u00b1 5 psi and the temperature increased to 350 u00b0 f u00b1 10 u00b0 f or 120 minutes once the autoclave pressure is up to 45 psi u00b1 5 psi the vacuum is not essential but may be maintained following this procedure the workpieces are cooled within the autoclave to a temperature below 140 u00b0 f and removed from the autoclave the laminated squares of layers no 2 and.