RE: drying coil forms

• To: tesla-at-pupman-dot-com
• Subject: RE: drying coil forms
• From: "ROBERT CRESSLER" <59CREROB-at-MENASHA-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Wed, 08 Dec 1999 12:13:56 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

   ted,justin,all,
                    
snip
       I am using thinwall (1/8") Plexiglas for my secondary. yes, it costs
much more, but it is not hydroscopic and does not require and extensive
drying and sealing procedure.
snip
          acrylics (cast,extruded) are indeed hygroscopic , for  comparison
rigid PVC has a water  
absorption of .04-.4%  and  acrylics with .2-.3%  (wt. gain after 24hours
per ASTM D570)
This has come up before and I am still unclear as what dictates (or why)  a
superior coil form.To really confuse   me the dissipation factor at 1Khz
for acrylics is .02-.03 and PVC is.009-.017 !!?? 

Robert 

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