Silicon Sputtering target
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Sputtering target.
This is supposedly a boron doped silicon sputtering target. I have not researched whether that is a sensible claim or not, though it does look and feel like silicon.
Source: eBay seller matky
Contributor: Theodore Gray
Acquired: 10 September, 2004
Price: $37
Size: 4"
Purity: 99%