||Provides protection against some thicker liquids and dust, however it is not waterproof. It is also somewhat brittle and subject to cracking in high impact or high vibration applications. Up to 2600°F.
||Provides a very good seal with excellent mechanical strength. However, it's adherence to Teflon or silicone rubber lead wire is only fair. It is rated up to 265°F and bonds well to Duraflex lead wire.
||Provides similar mechanical properties as epoxy potting. Up to 600°F.
- RTV Potting, when used in combination with silicone rubber insulated lead wire, provides the best seal of all options.
- The down side to silicone is that it is limited to 500ºF and while extremely flexible, it is not as strong mechanically as other options.
- Although the RTV is rated for 500ºF, silicone rubber leads are only rated to 392ºF. An option is to use Duraflex lead wire instead. Duraflex is rated to 1000ºF and has a heavy silicone coating.
- While Duraflex is not sold as a waterproof wire, it performs very well in wet environments.
- Another option is to use crimped on leads, then the power pins are sealed where they enter the heater and the type of lead wire does not matter.