Ultraviolet Degradation: A reduction in certain performance limits caused by exposure to ultraviolet light.
Granules: Crushed rock coated with ceramic material, applied to the exposed surface of asphalt roofing products to add color and reduce ultraviolet degradation. Copper compounds added to these help make them algae resistant.
Further, the whole fabric is treated to resist ultraviolet degradation, a factor which normally contributes to the short life-span of plastic films in greenhouse applications.
 See also: Ground, Roofing, Drain, Water, Wood
  
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