[curiouscat]

Our regular grease seems to dissolve away leading to leaky ground glass joints. The reaction we are working on has MEK (methyl ethyl ketone) as a solvent and is heated to ~55 C.  Reaction runs for ~12 hours.

Any sugesstions for what grease might work? I was thinking of the silicones but wanted to get opinions from the real lab rats.

[discodermolide]

I presume this is normal scale?
How about using a ptfe sleeve. I only applied grease to the very top of the joint.
Is the joint damaged in any way?

[curiouscat]

I presume this is normal scale?

Yep. 5 Litres or so.

How about using a ptfe sleeve. I only applied grease to the very top of the joint.

I'll try that. Never thought of it. Thanks.

Is the joint damaged in any way?

Not visibly, no. It is old glassware though. Might be worn a bit.