Re: Dielectric Constants and Breakdown Voltages (fwd)

To: "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
Subject: Re: Dielectric Constants and Breakdown Voltages (fwd)
From: Tesla List <tesla-at-stic-dot-net>
Date: Wed, 12 Nov 1997 08:48:04 -0600
Approved: tesla-at-stic-dot-net


From:	DamDeName-at-aol-dot-com [SMTP:DamDeName-at-aol-dot-com]
Sent:	Wednesday, November 12, 1997 6:47 AM
To:	tesla-at-pupman-dot-com
Subject:	Re: Dielectric Constants and Breakdown Voltages (fwd)


Hello all,
   With regard to the puncture voltage an dielectric 
constant of mylar -- 7500 v ? (not 750 v ? )

   In either respect --- I recall some comment 
that mylar was not good for caps for T.C. service --
if  this is so (meaning my memory is not failing me) :>)
howcome ??? --- It seems worthwhile esp.if the 7500
V/mil is accurate ---

regards,
                 Sandy


 
 ---------- Forwarded message ----------
 Date: Fri, 7 Nov 1997 19:32:37 -0700
 From: Ken & Pat Prentice <prentice-at-sympatico.ca>
 To: tesla-at-pupman-dot-com
 Subject: Dielectric Constants and Breakdown Voltages
 
 Good day Ladies and Gentlemen
 
      I'm new and have been lurking for some time.. and thought that this
might help as a quick reference... I found this in one of the old electronic
mags.  (set your font Courier to see this properly)
 
    INSULATOR              DIE..CONST.    PUNCTURE VOLTS/0.001 inch
 ==================================================================
 Air.................................1.0.........  30
 Window Glass........................7.8......... 200
 Polyethylene........................2.3......... 450
 Paper (bond)........................3.0......... 200
 Polycarbonate (Lexan)...............2.9......... 400
 Teflon..............................2.1.........1000
 Polystyrene.........................2.6......... 500
 Epoxy Circuit board.................5.2......... 700
 Pyrex................................4.8......... 335
 Plexiglas...........................2.8......... 450
 PVC (rigid type)....................2.9......... 725
 Silicone RTV........................3.6......... 550
 Polyethylene Terphthalate (Mylar)...3.0.........7500
 Nylon...............................3.2......... 407
 Mineral Oil, Squibb.................2.7......... 200
 Shellac.............................3.3......... 200
 
 All measured at 1 MHz