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Physical Properties |
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Prolight® Polycarbonate (MarlonCS Longlife) has a good combination of physical, thermal and optical properties which make it a very suitable rooflight material.
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Impact Resistance
Of all glazing materials polycarbonate exhibits greatest resistance to impact over a temperature range of -40 to +130˚C. It is up to 200 times more resistant than glass. High impact resistance means that Prolight® is suitable for use in areas with a high risk of glazing breakage, such as areas prone to vandalism or hail storms, where other glazing materials might be inappropriate. |
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Falling Dart Impact Test
The impact test illustrated demonstrates the impact resistance of Prolight®. A striker of diameter 16mm contacts a sample of sheet placed on a support ring with inner diameter 38mm. A weight of 1.8Kg is dropped on to the striker from a height of 1.5m. The resulting impact energy of 27Nm only dents the sample: it does not crack or penetrate.
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| Physical Characteristics |
Value |
| Specific Gravity |
1.20 |
| Water Absorption |
24hrs @ 23˚C |
0.35% |
| Water Permeability |
1mm thick |
<2.28g/m2 |
| Tolerances |
sheets <5m |
-0, +10mm |
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sheets >5m |
-0, +25mm |
| Thermal Properties |
Value |
| Softening point - Vicat |
145-150˚C |
| Deflection temperature under load |
135-140˚C |
| Thermal conductivity |
0.21W/m˚C |
| Thermal transmittance @ 1mm |
5.7W/m2/˚C |
| Coefficient of linear expansion |
0.068mm/m/˚C |
| Service Temperature range (no loading) |
continuous |
-40 to +100˚C |
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short term |
-40 to +130˚C |
| Mechanical Properties |
Value |
| Tensile strength at yield |
>60MPa |
| Tensile strength at break |
>70MPa |
| Elongation at yield |
6-8% |
| Elongation at break |
>100% |
| Elastic Modulus |
>2300MPa |
| Impact strength (lzod notched @ 23˚C) |
900J/m |
| Resistance to impact 20mm diameter simulated hailstones impacting at 21m/s will not cause breakage. |
| Solar Transmission Properties |
| Colour |
ST (%) |
SHGC |
SC |
| Clear |
83 |
0.84 |
0.98 |
| Bronze 'A' |
55 |
0.63 |
0.73 |
| Opal 'EF' |
51 |
0.54 |
0.63 |
| Grey 'H' |
49 |
0.59 |
0.69 |
| Heat Guard |
15 |
0.30 |
0.34 |
| ST - Solar Transmission, SHGC - Solar Heat Gain Coefficient, SC - Shading Coefficient |
| Light Transmission |
Value |
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| Colour |
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| Clear |
88% |
| Bronze 'A' |
32% |
| Opal 'EF' |
46% |
| Grey 'H' |
29% |
| Heat Guard |
7% |
