Acrylics (Poly Methyl Methalcrylate, or PMMA) are a proven, reliable material for Pressure Vessel for Human Occupancy (PVHO) windows. The current codes and standards reflect a first-generation development of defining a nonmetallic for pressure vessel application. Subsequent investigations in material science as well as decades of operational experience indicates the code-specified 10,000 cycle limit for some flat disc acrylic ASME PVHO windows may be eliminated using criteria consistent with the ASME Boiler and Pressure Vessel Code

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