| When thermoplastic
products are produced by reheating and thermoforming flat sheet
stock, the temperatures involved in thermoforming can degrade the
sheet and affect its long term durability. Manufacturing by extrusion
means controlled processing conditions which optimise heating and
minimise residual mechanical stresses. Residual stresses can cause
excessive warping, bowing, and waisting of sheets, which can in
turn give rise to difficulties achieving weather tight fitting of
roofs.
Sheet Lengths & Tolerances
Sheets are available in lengths up to 13m. Note that these should
be regarded as stock lengths for cutting; it is often impractical
to use sheets exceeding about 4m in length due to the allowances
that have to be made for thermal expansion.
Tolerances:
Lengths up to 5m; -0, +l0mm
Lengths over 5m; -0, +25mm Width +/- 5mm
Profile
& Rooflight Types
In addition to greca and sinusoidal profiles for domestic applications,
Marlon CS Longlife can be extruded in profiles which match commonly
available metal roofing and cladding profiles.
Marlon CS Longlife sheets can be used for rooflights in single skin
uninsulated roofs. They can also be used in insulated and composite
panel roofs in the form of double skin site assembled rooflights and
factory assembled insulating rooflights.
Product information sheets specify each profile, its installation,
and limitations on spanning capabilities for given sheet thicknesses
and applied loads. Marlon CS Longlife profiles are suitable for use
in new buildings, as well as replacing glass and other rooflighting
materials when renovating existing buildings. |
