Re: Invar low expansion metal

Yes, it pretty much looks like stainless, and it's slightly magnetic like 410 SST. I have some 1" diameter bars of invar 36 in my shop that were purchased surplus several years ago for a few $$. Who knows, someday they may find their way into an optical apparatus.

Invar is just nickel and iron, so only a total Green weenie or OSHA bureaucrat would try and label it as a hazardous material. The only hazard I can imagine in working it is if I dropped a bar on my toes!

Larry Bourdillon wrote:
"Ed Majden" <epmajden@xxxxxxx> wrote in message news:BF50BF97.3D90C%epmajden@xxxxxxxxxx

in article dgfpso$o78$1@xxxxxxxxxxxxxxxxxxx, Malcolm Stewart at
malcolm_stewart@xxxxxxxxxxxxxxxxxxxxxxxx wrote on 9/16/05 18:00:

  Expensive is right!  WOW!  I didn't know it was harmful either!  I'd
better try something less harmful.  Thanks to all for the information.

Ed



Invar is just another nickel-iron alloy, one with a low CTE. Nickel itself can be an irritant to the skin of some individuals (it's no longer much used in the plating of eyeglass frames, etc.). Appearance wise, Invar looks much like a darkish, dull stainless steel. Perhaps there's another alloying constituent that is "harmful".

...larry 


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