Dielectric and thermal greases 

Dielectric and thermal greases are moisture-resistant sealants engineered for aircraft, automotive and marine ignition systems and spark-plug connections, cut-off circuits in electric wiring systems and connections.

They are used as sealants for cable connectors, battery terminals, rubber door seals, plastic and rubber O-rings, and as an assembly lubricant for various metal-on-plastic and metal-on-rubber combinations.
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By brands

MOLYKOTE
ARALDITE
DOWSIL
KRYTOX
SILASTIC
SYLGARD
BOSTIK
PERMABOND
ELECTROLUBE
MERBENIT
XIAMETER
REN
DEVCON
SOCOMORE
DUNA CORRADINI
VOLTALEF
AIRTECH
SYNTHENE
OSIXO
HB FULLER
HERAEUS