• Most uPVC pipes have installed underground or under cover, exposed piping 
  applications are steadily increasing. Extensive testing, under rigorous 
  laboratory conditions and in the field in tropical, sunlight has proved 
  that, uPVC pipes which are exposed to direct sunlight for more than 6 months
  is likely to loose it's color the impact strength is also reduced. But the 
  tensile strength remains unaltered. Tests have shown that the color lose is 
  limited to a depth of 0.15mm after approximately 12 months.
  The fact that tensile strength is not a affected means the pressure rating 
  of uPVC pipes and fittings remain constant. Reduction in pipe impact 
  strengthwas apparent after two years of exposure to weathering and
  ultraviolet radiation. 
  However considering the high impact strength of uPVC the reduction is not 
  significant enough to warrant concern. These laboratory findings are 
  reinforced by the excellent performance achieved by pipes in actual 
  installation.
  Especial additives are added to PVC to make pipe and fittings resistant 
  to ultraviolet effects applying coating is also suggested to block the 
  ultraviolet radiation from affecting the uPVC pipe. The most common coat, 
  which is used for above ground service, is water-based latex paint.
  

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