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Technical Information

Fire
The thermoplastic glazing materials have been tested in accordance with the relevant British Standards with the following results:
Test Polycarbonate Standard Acrylic PVCu
BS 2782: 1970 Method 508 A Flame retartant Not flame retardant Flame retardant
BS 2782: 1970 Method 508 D
Very low flammability
Flammable Very low flammability
BS 476: Part 7: 1971 Surface spread of flame (or 1987) * Class 1 (see note) * Class 3 * Class 1
BS 476: Part 8: 1972 Fire resistance of elements of building construction ** Less than 1/2 hour ** Less than 1/2 hour ** Less than 1/2 hour
BS 476: Part 3: 1958 External fire exposure roof tests AA DDX Not applicable
Building Reg. Appendix A Approved Document B TP(a)* TP(b)* TP(a)*
* when tested in 3mm thickness and over ** Assumed results Note: Materials which achieve class IY can be regarded as having an AA designation
Weight
3mm Polycarbonate - 4.5kg/m2 3mm PVCu - 4.5kg/m2
Relative Impact & Breakage Resistance
6mm Georgian Wired Glass 3mm PVCu - approximately 50 times stronger than the glass 3mm Polycarbonate - unbreakable within the limits of the test comparison
Thermal Transmission (U Value)
Polycarbonate Single Skin - 3mm 5.4w/m2/degree C Polycarbonate Double Skin - 3mm 2.6w/m2/degree C
Light Transmission (Based on 3mm)
Polycarbonate clear - approximately 82% Polycarbonate opal - approximately 50%
PVCu
Clear - approximately 85% Opal - approximately 72%
Cast Acrylic
Clear - approximately 92% Opal - approximately 78%
All Astrofade rooflights can be supplied in bronze to control solar gain and glare
Material Light Transmission Total Solar Energy Transmission
Bronze Polycarbonate 50% 55%
Bronze PVCu 60% 69%
© 2019 Astrofade Ltd. All rights reserved. Registered in England No. 03647279.
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