Doing without rubber gaskets

Air lock doors must be sealed when closed to prevent loss of the air in a lunar colony. An alternative to using polymeric gaskets is using glass rope gaskets. The edges of the door, the door frame and the glass gasket itself should be heated to the temperature at which the glass is pliable. The gasket is forced into the space to be sealed and allowed to cool. This should provide an adequate seal. To open the door the gasket would either be reheated or broken.