Quote Originally Posted by not2big View Post
In my opinion, based on six years of pumping, time under vacuum is a critical factor.

When I first started pumping, it would take up to 20 minutes at 5 hg before I started to pack the cylinder. Now I can start packing the cylinder at 5 hg after 5 minutes of pumping.

From another perspective, at 5 hg I can fully pack the cylinder after 30 minutes of pumping. At 4 hg it takes 30 - 40 minutes.
Are you able to pack the cylinder in about 20 minutes at a lower hg pressure now?