Usually some form of high density polyethylene (HDPE) or a variety
called UHMW - ultra high molecular weight which is quite slippery and
used as an inexpensive substitute for TFE in sliding bearings, e.g.
conveyer strips, low speed sleeve bearings, and part handling machines.
UHMW is not fun to machine because it is so slippery and gummy.
Both are not UV resistant, although it might take a while for thick
panels to degrade sufficiently to be a problem. It's biggest advantage
is it is cheap. Polyethylene is also a very good RF insulator if
protected from exposure, but not very strong.
On 4/21/2012 8:30 PM, Bob K6UJ wrote:
> I brought this up in a post about dipole center supports and thought I would
> ask the towertalk gang about this.
> I keep looking at those white cutting boards and wonder if they would work
> for antenna stuff. Anyone know what type of plastic they are ?
> The ones I have seen are about 1/2" thick and look like they are begging to
> be used for antenna support projects. They are white and look and feel like
> teflon, but I'm sure they are not, hihi.
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