Hardness test: In this test a scratch is made on brick surface with a hard thing. If that doesn’t left any impression on brick then that is good quality brick. - Study24x7
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25 Mar 2019 03:56 PM study24x7 study24x7

Hardness test:

In this test a scratch is made on brick surface with a hard thing. If that doesn’t left any impression on brick then that is good quality brick.

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