What's the difference between Mohs hardness and pencil hardness?

A: Mohs hardness and pencil hardness are two completely different hardness testing standards, and their values cannot be directly compared. ① Mohs hardness: Through ten standard mineral scratch tests, grades 1 to 10, nail hardness is approximately 2.5, copper key hardness is about 3, knife hardness is about 5.5, and quartz hardness is about 7. The Mohs hardness of mobile phone glass is approximately 6 to 6.5. ② Pencil Hardness: Use pencils of different hardness (6B to 9H) to scratch at a 45° Angle and under a pressure of 1kg to test the hardness of the coating film. The common tempered film is labeled as" 9H" It is the hardness of a pencil, approximately equal to 4-5 on the Mohs scale, which is lower than that of the glass of a mobile phone screen itself. Woowhead Guanfudun adopts the Mohs 6H (self-tested by the brand laboratory), and the South Glass high alumina glass is strengthened three times. Under normal circumstances, it can resist minor scratches from daily keys, coins, etc. Note: The Mohs 6H and Pencil 9H test standards are different, and the values cannot be directly compared.