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Glazing Materials - Optical Properties

Optical properties of commonly used glazing materials.

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The ideal solar collecting energy glazing material is transparent to short-wave infrared radiation and opaque to long-wave radiation.

Optical properties of some typical glazing materials:

Short-wave Infrared Solar TransmittanceLong-Wave Infrared Transmittance
Window glass (float glass) 4 0.83 0.02
Low-iron glass 3 0.89 0.08
Acrylic Glass - Poly(methyl methacrylate) (common trade names Plexiglas, Limacryl, R-Cast, Perspex, Plazcryl, Acrylex, Acrylite, Acrylplast, Altuglas, Polycast, Oroglass and Lucite) 3 0.82 0.02
Polyvinyl Fluoride (known by his trade name Tedlar from DuPont) 0.1 0.92 0.22
Polyester, Mylar 0.1 0.87 0.18
  •  1 mm = 0.03937 in
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