For those of you who have rotary evaporators or other chemistry glassware in the kitchen, what do you use to grease the ground glass taper/ ball joints so that the lubricant does not either absorb or introduce flavors into the product?
Thus far I have not found anything that is a GRAS food additive marketed as a vacuum grease, but I have found some very expensive fluorinated/ PTFE compounds (Santovac 5GB) that would be insoluble in any food items being run through the system.
Best Answer
Many manufacturers and manuals say that you shouldn't grease them. However, for parts of the process you may be able to use Taylor ice cream machine lubrication or Vaseline (see below).
Dave Arnold who also runs the Cooking Issues blog, is the king of RotoVap in the kitchen. There is a full article over here on Dispensery Grade where he discusses RotoVap in the kitchen.
Here's an excerpt from the comment section of the article:
If you go with vaseline, make sure you get the food-grade version.