Sandwich Panel Sheets
The sandwich panel consists of two facings of relatively thin metal sheet profiled preferably and of high strength enclosing a core, which is realtively thick and light but has adequate stiffness in a direction normal to face of the panel. The facings are of steel or aluminium. The core is made of polyurethane. The advantages of sandwich panel with polyurethane in the core over normal panels used for roofing or walling are as under:-
- High load bearing capacity at low weight
- Excellent and durable thermal insulation
- Absolute water and vapour barrier
- Excellent air tightness and free of thermal bridges which results in considerable energy savings.
- Surface finished facings providing resistance to weather and aggressive environments
- Capacity for rapid erection without lifting equipments; easier installation in hostile weather conditions
- Easy repair and replacement in case of damage
- Long life and very low maintenance cost
- Good sound insulation
- Reasonable fire reaction and resistance
The company envisages to produce sandwich panels for three applications. i.e Roofing, walling and cold room walling. The panels will use steel or aluminium sheets for facing and will be manufactured in thickness range of 30 to 120 mm. They will come in widths of 1000 mm to 1200 mm and maximum length of panel will be 15 meter. The typical panels will look as under:-
Table of Safe spans
Values guaranteed with external face in steel, 0.5 mm thick, and internal face in steel, 0.4 mm thick or with both faces in aluminium 0.6 thick with external face in aluminium, 0.6 mm thick, and internal face in steel, 0.5 mm thick. The spans l (m) as a function of a uniformly distributed overload P (kgf / m2) have been obtained from load tests carried out in Metecno laboratories, and provide a deflection f = l / 200 with a safety coefficient that complies with the UEAtc standards for insulated panels, which have been established and are implemented by primary European Certifying Organizations.
With external and / or internal steel thickness inferior to the above mentioned ones, the guarantee on the admissible loads for the spans indicated in the table is maintained, while it is not maintained on the deflection limit and thesafety coefficient.