raden wrote:
In message , T i m
writes
On Sat, 11 Feb 2006 22:12:54 GMT, raden wrote:

In message , Harry Bloomfield
writes
T i m formulated the question :
Wasn't it also in the heatsink compound we used to use ..?

No, it was inside the actual device -usually the higher power rated
devices.

The main danger was from insulating heatsink washers - I've got some
somewhere. The danger being from inhaling beryllium dust if one got
broken

Were they the translucent ones you found under 2N3055's ;-)

No that would be nylon

Never. Mica usually..Mylar also used.

Beryllium is white and hard - a bit like ceramic


No, beryllium is a metal. Its beryllium OXIDE that is hard and white.