[DIYbio] Re: Can't find supplier for ~1 inch Viton stopper

I have recently used butyl rubber for sealing, it is very easy to work with & clean up easily (even vs. silicone), stays soft & rubbery indefinitely, stays tacky, and very high stretch.  Form it around the wire and neoprene sheath and tighten down washers on both sides, it will compress to form a gasket-seal (ooze out with mechanical compression).   It is also incredibly inexpensive.  There are different product qualities (purities?) so look into the source.  Cheaper versions are sold for automobile doors, HVAC seals, etc.  It will outgas (maybe forever?).  I think it could work well for you.  You'll need maybe a 3" length of 1/4" strip, to hand form into the shape you need, and the lengths you find to buy (comes in rolls) might be 10' etc (a few bucks a foot?), so you'll have enough to last a lifetime.


## Jonathan Cline
## jcline@ieee.org
## Mobile: +1-805-617-0223
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On Friday, August 29, 2014 1:30:13 AM UTC-7, Nathan McCorkle wrote:

looking to make a vacuum container wire feed-through, thinking I'll
drill a hole into an existing aluminum blocking plate (maybe with a
chamfer/angle to it), shove some piano wire through the stopper, then
shove that into the blocking plate and pump down. Maybe I'd extend the
existing blocking-plate screws and screw down a clamp on the stopper.