How to seal a system containing ethanol, but low friction?
Still working on my solar device (in Copenhagen now), and it's coming along fairly nicely. Should hopefully have a full instructable in a couple of weeks.
However, I'm having problems at the moment trying to keep the thing water tight, where the axle leaves the system, taking out the rotational motion.
I'm using the bearing housing from an old bike wheel (photos to come) and I've got it sealed well where it's attached to wall of the container, but the ethanol is flowing pretty freely through the bearings themselves. I need it not to.
I could use something like an O ring to seal the axle, but friction is a big issue. I wanted to pack the whole axle and bearing housing with grease, but grease dissolves in ethanol.
Is there anything grease like which isn't soluble in alcohol? Salt, maybe?
Cheers all. (Nearly there...)