How hard is a ceramic coating? What is 9H, 10H? Am I being fooled? – find out for yourself.

Feynlab Treatment - Bentley |

This is a very touchy subject as many companies have built their brand around the hardness rating. (So and so’s) 9H Ceramic. Let’s start with a little background on both pencil hardness and the infamous MOHS scale. The pencil hardness method was originally developed by pencil manufacturers as a quality control method in the early […]