A plastic hermetic seal (PHS) was developed which is practical used up to operating pressure 35MPa.
This PHS was experimentally confirmed to have superior pressure endurance and high reliability compared with conventional glass hermetic seals.
By elasto-plastic analysis, deformation of metal flow and subsequent plastic compressive force were analyzed which determine the performance of PHS. The effects of thickness of base metal and clearance of plastic and base metal were clarified.
Also, an approximate evaluation equation of the extraction force of PHS was developed and compared with actual values.
Many kinds of environmental tests of PHS were conducted. This PHS was proven to have a pressure endurance of 500-600 PMa and long time endurance for oil immersion at temperatures up to 100°C.
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