Mohs Hardness Scale U S National Park Service All tempered glass passes the 9H scratch test, so retailers technically aren't lying about 9H hardness Typical glass sits at 55 on the Mohs scale, with tempered glass usually around 7 Geologists do it according to the Mohs Scale of Hardness There That's your "hardness" joke for the post Now down to business, with the hardest (and softest) scale there is
Mohs Hardness Scale Ultra Tec Faceting Diamond is the hardest known material on the Mohs scale and has a Mohs hardness of 10, so it can produce a scratch on the surface of say, Corundum — Mohs value 9 — but not the other way around Notable from their Day 1 tests is that the Apple Watch Sport screen does scratch but only after going pretty far down the Moh’s hardness scale (7-rated) into the unlikely to ever happen category
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