The Certification of Polycarbonate Transparencies - An Appeal for Reasonable Requirements,
SIERRACIN CORP SYLMAR CALIF
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This paper looks at the physical properties of polycarbonate relative to glass and acrylic. It explores the current FAACAA certification requirements for glass and acrylic, and the ways polycarbonate can be damaged in the manufacturing processes. In conclusion, it urges the FAACAA to treat polycarbonate windows as transparent structure and, recognizing the extent of the service life of aircraft glazings, not impose load factor requirements in excess of those required for other pressurized structure. It also urges the ASTM to develop standard procedures to evaluate as-processed polycarbonate to insure the finished product is free from induced strength or fatigue defects. Finally, it suggests the Air Force the major user of polycarbonate in transparencies should evaluate the effects of long-term environmental exposure on the structural characteristics of lazing materials including glass, acrylic and polycarbonate and their appropriate interlayers.