Environmental Engineering Reference
In-Depth Information
Figure 6.4 Development of surface cracks on PP surfaces on exposure to a
filtered xenon light source (600 W/m 2 ) at 42°C and at different durations
of exposure.
Source: Reproduced with permission from Yakimets et al. (2004).
Once the mechanical integrity of the plastic is drastically reduced, diurnal
hot-cold cycles, action of animals, and friction from rainwater and wind
movement can break up the surface as well as the bulk of weakened
 
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