9H Glass Tempered Glass Screen Protectors for iPhone (XR and 11)
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The Screen is 6.06 Inches
WHAT IS 9H HARDNESS?
Many people use the tempered glass today without knowing what 9h hardness is. 9h refers to the Moh scale of mineral hardness. Friedrich Mohs invented this scale in 1812, and it ranges from 1 to 10 with glass around 5 and diamond at the top of the scale.
The scale is represented by numbers only without the "H" suffix. The suffix means the hardness of a pencil. To find a rating, you use the pencil test, which compares the relative hardness of a screen. When a manufacturer claims that their screen is 9h, it means the screen can resist scratches from the hardest pencil.
Of course, it makes no sense comparing a glass material with a pencil. Hence, we analyze the hardness based on the scratch the hardest pencil has on the screen. From soft to hard pencil, pencil hardness ranges from 9b to 9h. Testing various displays, we use pencils that have a lead hardness ranging from 6b to 9h, pressed against the surface at a 45-degree angle. The codes are given based on the hardest pencil that fails to scratch the surface. The table below shows Moh hardness scale.
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