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Glazing Materials - Optical Properties

Optical properties of some 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.

Typical optical properties of some common glazing materials are indicated below:

Material	Thickness (mm)	Short-wave Infrared Solar Transmittance	Long-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

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