Although some people may consider it to be â low tech,â using pencils to test hardness is still a method used by many coatings manufacturers and some finishing shops. The test uses special pencils ...

Discover how to evaluate and compare the surface hardness of different protective coatings using accessible DIY testing ...

A material’s hardness relates to its mechanical resistance when subjected to mechanical indentation by another harder body. Diamond is considered the hardest natural material and is typically used for ...