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Torr Seal is an excellent sealant, bonding to many materials (i.e. metals, ceramics, and glass) for vacuum systems that are designed to reach pressures as low as 10-9 Torr from -45ºC to 120ºC.
Epoxy with a high electrical resistivity for vacuum sealing and structural bonding.
Silver-filled epoxy glue with high electrical and thermal conductivities for structural bonding.
A silicone resin designed to be a sealant on systems that are being evacuated down to ultra-high vacuum.