cap problems

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: cap problems
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Thu, 11 Jun 1998 22:44:13 -0500
• Approved: tesla-at-stic-dot-net

----------
From:  Hollmike-at-aol-dot-com [SMTP:Hollmike-at-aol-dot-com]
Sent:  Thursday, June 11, 1998 6:24 AM
To:  tesla-at-pupman-dot-com
Subject:  Re: cap  problems

Bob,
   I haven't looked at material compatability charts as of yet, but it sounds
like the oil attacked the acrylic and the tape.  It also sounds like the poly
absorbed the oil and swelled, causing the acrylic to shatter, once weakened by
the oil.  It sounds like your cap will survive once you replace the acrylic
with something more compatible.  
     You should also measure the capacitance again.  The swelling of the poly
surely has changed the capacitance and you may have to add a plate or two to
get back to your design capacitance.
   You should try to contact the manufacturer of this oil and see if they can
provide you with a commpatibility chart for it.  It sounds as though a thick
sheet of polypropylene might be ok for sandwiching the cap, but it may soften
and swell like the dielectric.  How about glass plates for sandwiching the
works?  It would be more easily breakable, but would not be attacked by the
oil.  
  Good Luck.
Mike Hollingsworth

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