silicon - but silica , an oxide of silicon usually in the

SiO2 family.

Vance

Vance, I agree with you that the castings are
infused with silica. The element used for IC
wafers is, however, indeed silicon. Great care
is used to prevent oxides when making
semiconductors until making insulating layers.
Ok off topic, sorry Paul! Bill Jepson

I wonder how far they are infused. I think you can grind off the
surface layer and castings will weld fine.

Paul Lamar

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