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A comment on Super-hard metal 'four times tougher than titanium'. Parent comment

Re:Super-hard metal 'four times tougher than titanium' by bronson on Sunday July 24, 2016 @03:43PM (#12154507)
You're asking if rubber is considered hard? What type of rubber do you have in mind?
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Re:Super-hard metal 'four times tougher than titanium' by StavrosK on Sunday July 24, 2016 @06:26PM (#12155202)
Any, I guess. Tyre rubber is not easily deformed permanently, although I guess it is easy to scratch.
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