Re: oil filled resonators

To: tesla-at-pupman-dot-com
Subject: Re: oil filled resonators
From: Bert Hickman <bert.hickman-at-aquila-dot-com>
Date: Fri, 18 Oct 1996 00:07:41 -0700
Tesla List wrote:
> 
> >From MALCOLM-at-directorate.wnp.ac.nzThu Oct 17 21:22:58 1996
> Date: Thu, 17 Oct 1996 19:29:47 +1200
> From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
> To: tesla-at-pupman-dot-com
> Subject: Re: oil filled resonators
> 
> Bert,
>         Thanks for this valuable information. But this is rather
> distressing. It looks as if some of the "best" plastics for our work
> are in fact the worst when it comes to oil immersion.
> 
> >                         25 Deg
> >                 Typical      With
> > Common          Trade           Mineral
> > Symbol:         Name              Oil
> > =======         =========       =======
> > ABS          Cycolac       *
> > CAB         Butyrate       *
> > CPVC            -          A
> > Epoxy Glass    G10         A
> > Epoxy               -          A
> > HDPE            -          B
> > LDPE            -          B
> > POM         Delrin         A
> > PA 6        Nylon 6        A
> > PA 66       Nylon 66       A
> > PC          Lexan          C
> > PET         Mylar          A
> > PI          Kapton         A
> > PMMA        Plexiglas      B
> > PP              -          C
> > PS              -          D
> > PTFE        Teflon         A
> > PUR             -          *
> > PVC             -          A
> > PVF             -          A
> > PVDF        Kynar          A
> >
> >    A: No significant impact
> >    B: Slight Swelling and absorbtion
> >    C: Moderate Attack. Limited Life
> >    D: Decomposes/Dissolves
> >    *: No Data Available
> 
> Polypropylene scores a "C"  and Lexan!! :(
> Polyethylene scores "B"  as does PMMA :(
> 
> Enjoy?  I think not but definitely worth knowing!
> 
> Thanks,
> Malcolm

Malcolm,

I wouldn't worry too much about a "B" - there's no mechanical
degredation involved. A C, however, may merit som concern...
Seems like everwhere you look, theres another tradeoff!!

-- Bert --