I got a catalog a while ago from Berghof/America (800-544-5004) that was
all Teflon products. Very comprehensive. They do sell stopcocks.
Mike Knierman
knierman@lilly.com
>Hello,
>I have a BUCHI rotavap purchased from Brinckmann Co. I suspect that
>some vacuum grease may contaminate the product when the continuos feed
>is using during the evaporation of hexane/IPA mixture solution.
>Unfortunately, Brinckmann does not have Teflon stopcocks. Does anybody
>know the place where the custom Teflon stopcock can be ordered? Any
>problems with the Teflon "leaking" under vacuum?
>Also, the prep. HPLC Rainin system has a prep. rack with polypropylene
>funnels that are not resistant to IPA and have a limited resistance to
>hexane. I wonder if anybody used Teflon lining or custom ordered glass
>funnels?
>
>Thanks,
>Michael Breslav
>R.W.Johnson PRI
>Spring House, PA
>