Cardboard secondary forms

• To: "tesla-at-pupman-dot-com" <tesla-at-pupman-dot-com>
• Subject: Cardboard secondary forms
• From: iragroff <iragroff-at-cobweb-dot-net>
• Date: Fri, 08 Nov 1996 21:24:54 -0500

Cardboard tubes are available under the tradename of "Sonotubes". They
are used as forms for concrete pillars and are available in 8 foot
lengths in diameters  from 6 inches to 24 inches. These inexpensive
tubes are very sturdy and will soak up your favorite resin or other
impregnating medium. They have a clear film on the inside (to give a
smooth finish to the concrete) but this is easily peeled out.
  I have used these tubes in another hobby(amateur telescope building )
and they are nice to work with. I think they would be lighter and less
lossy than PVC pipe. They are available from most building supplies
jobbers.
								Ira

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