Clear choices | Features

The properties of ETFE
	80 µm clear	100 µm clear	150 µm clear	200 µm clear	100 µm white	200 µm white

light transmittance	0.93	0.93	0.91	0.9	0.45	0.37
light reflectance	0.07	0.07	0.08	0.09	0.5	0.59

solar direct transmittance	0.94	0.93	0.92	0.91	0.55	0.47
solar reflectance	0.06	0.07	0.07	0.08	0.39	0.47
solar absorbence	0	0	0.01	0.01	0.06	0.06
total solar transmittance	0.94	0.93	0.92	0.91	0.57	0.49

short-wave shading coefficient	1.08	1.07	1.06	1.05	0.63	0.54
long-wave shading coefficient	0	0	0	0	0.03	0.02
total shading coefficient	1.08	1.07	1.06	1.05	0.66	0.56

UV transmittance to 380 nm	0.88	0.86	0.83	0.76	0.06	0.01
UV transmittance to 400 nm	0.89	0.87	0.83	0.79	0.13	0.06

mean solar gain factors	0.86	0.86	0.85	0.84	0.52	0.45

sample thickness (mm)	0.082	0.105	0.155	0.206	0.097	0.205

Source: ETFE Foil Cushions as an Alternative to Glass for Roofs and Atria