Polyethylene is a useful transmission material for far infrared sampling.  Polyethylene is non-absorbing beyond 14 microns.  Transmission is about 80%.
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Poly Sheet

Polyethylene Sheets - 12" x 12" (Specify thickness)
List Price $127.00
Poly Sheet

Polyethylene Sheets - 24" x 24" (Specify thickness)
List Price $190.00