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In article ,
says...
In article ,
"DeepDiver" wrote:

wrote in message
oups.com...

You want scratch resistance and you want it now? Try the close cousin
to the armor, aluminum oxide. Used for bar scanner windows.

Also known as corundum.

I believe you probably meant "carborundum"...

Corundum is natural crystalline aluminum oxide, Carborundum
is a tradename for manmade silicon carbide.

Ned Simmons