The ambient temperature in near-equatorial regions may reach 50-55°C. However, the plastic samples exposed under such extreme conditions may reach about

Table 5.4 Annual Average Incident Solar Radiation for Different Geographic Locations WorldWide


Incident Solar Radiation, kLy/year

Florida (USA) Arizona (USA) Almeria (Spain) Basel (Switzerland) Dhahran (Saudi Arabia) Melbourne (Australia) Singapore

77°C. Usually, the plastic surface temperature is significantly higher than the surrounding air temperature. Exposed sample temperature plays an important role in degradation during weathering. The greenhouse films are exposed to heat stress at the point of contact with metallic framework.

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