This is a common issue with rotary seals or really any type of seals. Yes, as Sculley noted you can use PTFE O-rings to minimize this issue, but you may be changing one problem for another. Couple of things to consider: 1. Are you over compressing the O-rings? 2. Is the surface finish on your shaft too good? 3. Is your O-ring groove dimensioned properly? 4. Is your O-ring too soft? Consider trying a slightly harder one, this may require a compound change. Niel Leon engineering.com |