Vacuum Furnace Door Seal Grease

The vacuum grease smooth out small irregularities on the sealing surfaces and the surface of the o ring and thereby improves particularly at low degrees of deformation the sealing effect.

Vacuum furnace door seal grease. If the pumping system is operating correctly then one of these failure modes is likely the cause. The types of lubricants for vacuum service fall into three general categories. 1 if the door that houses the lip seal rotates the lip seal should be lubricated with dry graphite powder. The door seal on a vacuum furnace sees some of the highest wear and tear through normal operation.

Reapply a thin coating of vacuum grease as necessary. Here the vapor pressure of the grease should be noted increases greatly with the temperature and should be well below the desired operating pressure. The first q a community for vacuum furnace end users and operators. 2 if the door has a true autoclave design whereas the locking ring rotates around the stationary door then either vacuum grease and or graphite dust may be utilized.

Graphite powder should be used on the lip seal. A damaged door seal vacuum furnace leaks and or hot zone contamination. Vacuum grease which you should use on the face of the seal and why methods for keeping the seal off the ground and clean during the installation process. Figure 11 16 debris ladden door seal.

A wet organic or silicone compound based oils and greases b dry lubricants including ptfe teflon and metal dichalcogenide compounds e g. Do not grease the lip seal. Molybdenum disulfide tungsten diselenide and c metal on metal combinations. Wipe the door o ring and flange with a clean lint free rag before closing the door.

Clean the chamber door or bottom head flange and lightly grease the o ring with a thin coating of high quality vacuum grease. As such it tends to be the cause of pump down issues about 80 of the time. The role of lubricants in vacuum furnace seals. Click here to access the step by step instructions for the o ring or lip seal installation on a rotating vacuum furnace door.

Despite what one may think excess vacuum grease does not aid in sealing and should be removed as it is a getter for shop debris which will interfere with the o ring s ability to seal. Inspect and wipe clean this seal each time the door is opened after a furnace cycle. How to seal a leaking o ring with grease.