Re: oil filled resonators

To: tesla-at-pupman-dot-com
Subject: Re: oil filled resonators
From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
Date: Thu, 17 Oct 1996 19:29:47 +1200

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