Connector insulation
- phenolic
siver/silver/teflon or silver/nickle/phenolic
bakelite - is this the same as phenolic?
polystyrene or polyethylene insulators melt when heat applied from soldering
Delrin insulating material is a little better but still can get soft at soldering temperature.
Teflon insulating material is very good and are increasingly available.
phenolic insulating material that was very good at soldering temperature.