Molybdenum disulfide tungsten diselenide and c metal on metal combinations.
Vacuum furnace door seal grease.
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.
Click here to access the step by step instructions for the o ring or lip seal installation on a rotating vacuum furnace door.
Graphite powder should be used on the lip seal.
Do not grease the lip seal.
Here the vapor pressure of the grease should be noted increases greatly with the temperature and should be well below the desired operating pressure.
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.
The role of lubricants in vacuum furnace seals.
The types of lubricants for vacuum service fall into three general categories.
Lubricants for vacuum service are a diverse family of highly formulated products.
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.
A wet organic or silicone compound based oils and greases b dry lubricants including ptfe teflon and metal dichalcogenide compounds e g.
Figure 11 16 debris ladden door seal.
How to seal a leaking o ring with grease.
As such it tends to be the cause of pump down issues about 80 of the time.
Reapply a thin coating of vacuum grease as necessary.
Clean the chamber door or bottom head flange and lightly grease the o ring with a thin coating of high quality vacuum grease.
If the pumping system is operating correctly then one of these failure modes is likely the cause.
Wipe the door o ring and flange with a clean lint free rag before closing the door.
Inspect and wipe clean this seal each time the door is opened after a furnace cycle.
1 if the door that houses the lip seal rotates the lip seal should be lubricated with dry graphite powder.
On o ring seals look for cracks lack of elasticity flat spots dirt and metallic fines.
The first q a community for vacuum furnace end users and operators.
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.
