Research Papers: Mechanics and Metrology of Teflon Encapsulated O-Rings: Non-Linear Force Dynamics in Composite Sealing System The Illusion of Safety: A Regulatory and Technical Analysis of Compliance Integrity in High-Performance Sealing Systems Engineering Research Report: Advanced Sealing Architectures for Liquid Helium Cryogenic Systems under High-Radiation Conditions Encapsulated O-Rings in Vacuum Translucent Encapsulated O-Rings