Resurrecting this old thread to ask a question:
On the McMaster website, they have a chart showing the different uses for different types of o-rings: http://www.mcmaster.com/#o-rings/=ihx19n
(might have to click on "General Properties of O-Ring Materials" to get the table). In the Buna-N column, it says NR (not recommended) for alcohol.
Has anyone had a problem with the Buna-N type o-rings? Is there a better type that's come up in the last few years?