For all practical purposes seals should not leak visibly. Look at the seal in the water pump of your automobile or the seal in the air conditioning unit in your car and ask yourself if they are leaking. Fugitive emission regulations have changed the definition of leakage to less than a few parts per million depending upon the chemical involved. In other words there is plenty of wearable face left on seals when they are removed because of leakage. Seals are affected by pressure Extra heat is created at the faces.
Heat is almost always destructive.
The lapped faces will be distorted at some pressure. The elastomer will be extruded and become damaged at some pressure. Seals are affected by heat. All of the seal materials have an upper temperature limit. Its limit is determined by the type and grade of material being used.