| The couplings used with glass equipment are important from two main points of view : |
| --They must ensure the effective seal of the joint. --They should not induce any undue stress in the glass. --They must be reliable in all service conditions. |
| In this section we have covered couplings to join glass components together as well as to join glass component with a other metal equipment. |
| PTFE bellows are available for normal and vacuum applications together with flanges to connect them to glass or non-glass equipment. |