The compression jig is placed in the Pressure Vessel, and filled with demi water. Subsequently, the complete Pressure Vessel is kept in an oven at a temperature of 110°C for 70 days.
After the expiry of the test time, the compression jig is taken from the Pressure Vessel. The Prestressing is released from the O-rings. After 30 minutes of acclimatization, the plastic deformation is measured.