What kind of materials are usually used for bonding conductors?

This would depend vastly on the bonding that’s being carried out, whether its a safety earth style bond or a specific RF Bond. For RF bonds using RF braid then flat copper braid is the normal with the general rule of thumb, the shorter and wider the bond, the more effective it is. For metal plate bonding then Copper plate provides a good bond although there are other metals that will provide just as good a bond without the tarnish issue. Generally once bonds are in place then a milli-ohm measurement should be taken to ensure bonding between two metal surfaces has been made efficiently and the number to aim for is below 2.5 milliohms.

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