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Re: [TCML] Form materials, losses, carbon tracking, sealing
On Dec 14, 2007, at 3:18 PM, Dr.Hankenstein wrote:
I'm not so sure if using paper concrete forms is such a bad idea if
you take care to make a careful selection and remove the "inked"
layer, properly dry and varnish the form. For example, here is a
picture of a 12" by 48" coil built by Dr. Spark producing about a 8
foot spark. This coil uses a cement form and has produced arcs in
excess or 14 feet with no problem!
http://www.drspark.org/images/wwt2007/1281.JPG
Just one little data point on this topic:
Many "cement forms" (one popular brand being "Sonotube") are lined
with wax to promote easy separation from the concrete once it has
cured. As someone who likes to glue his form supports (end plugs)
into place, the presence of that wax was frustrating.
Long after I stopped using sealed cardboard forms, I discovered that
the same companies sell non-waxed versions of their tube for use as
shipping containers. They are just harder (but not impossible) to
find than the waxed versions.
- Bill "Gomez" Lemieux
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