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Transmission
Of Light
Spectral Transmission Of Polycarbonate Sheeting
Polycarbonate sheet is transparent to wavelengths of light between
385nm at the lower limit and approximately 5000nm at the upper limit.
Importantly polycarbonate is opaque to infra-red radiation: light
in the visible spectrum entering a building is absorbed by the interior
and contents and re-radiated as long wave infrared radiation, which
cannot be re-transmitted back through the polycarbonate sheeting.
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Consequently in addition to being an excellent insulating material
Marlon ST Longlife also retains heat inside buildings due to the greenhouse
effect which it creates.
Light Transmission
Thickness
(mm) |
Colour |
Light Transmission (%)
BS4203: Part 1:1980 |
Shading
Coefficient |
16 (Triple) |
Transparent |
82 |
0.95 |
16 (Triple) |
Bronze 'B' |
31 |
0.56 |
16 (Triple) |
Opal 'L' |
64 |
0.90 |
16 (Triple) |
Opal 'V' |
51 |
0.83 |
16 (Triple) |
Heat Guard |
22 |
0.38 |
16 (Triple) |
Bronze Opal |
30 |
0.42 |
16 (Triple) |
Heat Guard Opal |
13 |
0.32 |
The table shows the total amount of light transmitted by the various
thicknesses and finishes of Marlon ST Longlife.
Light Transmission
Sheet
Thickness
(mm) |
Clear S |
Bronze B |
Opal V |
Heat Guard
EG |
Bronze Opal
BT/U |
Heat Guard Opal
EG/TU |
4 Twinwall |
88 |
- |
- |
- |
- |
- |
6 Twinwall |
88 |
55 |
50 |
- |
- |
- |
8 Twinwall |
88 |
46 |
57 |
- |
- |
- |
10 Twinwall |
88 |
46 |
58 |
- |
- |
- |
16 Triplewall |
82 |
31 |
51 |
22 |
30 |
13 |
16 M wall |
76 |
- |
48 |
- |
- |
- |
20 Triplewall |
79 |
31 |
51 |
- |
- |
- |
25 Fivewall |
68 |
15 |
30 |
- |
- |
- |
30 Twinwall |
82 |
31 |
- |
- |
- |
- |
32 XX wall |
64 |
- |
- |
- |
- |
- |
35 XX wall |
- |
- |
40 |
- |
- |
- |
Transmission
Reflection And Absorption Of Light By Polycarbonate Sheeting.
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