Rahul Gupta
Hardness is a material's resistance to penetration. In general, an indenter is pressed into the surface of the material to be tested under a specific load for a definite time interval, and a measurement is made of the size or depth of the indentation.
Different Hardness testing methods are Portable,Rockwell Superficial,Brinell,Vickers,Concrete,Mohs. Sigma covers all these Hardness testing with honest and accurate results.
