Martin Eastburn fired this volley in news:N%
:

IIRC BeCu tools are non-conductive.

YRI (you recall incorrectly). Beryllium copper and beryllium bronze are
"non-sparking alloys". They're used in explosive environments (of which I
have some experience), because they will not raise a spark when struck
against themselves or other metal surfaces.

Beryllium/copper/tin/zinc alloys are used all the time for springs and
electrical contacts in fixtures, switches, and machinery.

LLoyd