Beryllium copper parts are also an issue although the beryllium content
is only 0.3%-0.5% by weight.
Bruce
Bob Camp wrote:
Hi
The same caution applies to the beryllium in beryllium oxide heat spreaders.
You find them in old RF transistors and some RF tubes.
Bob
On Mar 10, 2010, at 6:45 PM, Bruce Griffiths wrote:
There's at least one known case where someone attempted to grind a beryllium
mirror substrate using conventional methods without proper control of dust
resulting in his death.
Bruce
Neville Michie wrote:
Just in case anyone finds a beryllium brick somewhere and tries to use it:
Beryllium is very very poisonous.
cheers,
Neville Michie
On 11/03/2010, at 10:08 AM, Bruce Griffiths wrote:
p...@pseng.org.uk wrote:
Looking at the specific heat of metals:
http://www.engineeringtoolbox.com/specific-heat-metals-d_152.html
Wouldn't Beryllium be better instead of aluminium?
I could foresee a few problems though eg machining holes at home, never mind
where to get a block from.
Phil
Actually in this application minimising the volume of the metal block rather
than its weight is probably better so one should use specific heat*density as a
figure of merit.
METAL Specific heat*density (W/J/cubic cm)
Aluminium 2.46
Beryllium 3.29
Copper 3.49
Silver 2.41
Iron 3.87
Thus copper and iron are better choices than Beryllium they also poses fewer
machining diffculties
Bruce
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