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Optical Properties Parylene exhibits very little absorption in the visible region and is,  therefore, transparent and colorless. Below about 280 mu both N and C absorb  strongly. Ultraviolet Spectra of Parylene C and N Both  parylenes are relatively featureless to at least 50 micron wavelengths (except  for a few characteristic peaks), especially in thin film form (<1  u). Radiation and Weathering Resistance Parylene C and N  films show a high degree of resistance to degradation by gamma rays in vacuum.  Tensile and electrical properties were unchanged after 100 megarad dosage at a  rate of 1.6 megarads per hour. Exposure in air leads to rapid  embrittlement. Although stable indoors, the parylenes are not recommended  for use outdoors when exposed to direct sunlight.