Types of Hardness Testing Explained
HARDNESS
The SI unit of hardness is N/mm². It has significant diagnostic capabilities for abrasion or mineral identification. The majority of hydrous minerals, such as halides, carbonates, sulfates, and phosphates, are rather soft since there is a general relationship between hardness and chemical composition. With the exception of marcasite and pyrite, sulfides are typically soft, while silicates are hard and contain the majority of anhydrous oxides.
The hardness of various materials varies generally. For instance, hard metals like titanium and beryllium are tougher than wood, common polymers, and soft metals like sodium and metallic tin. Macroscopic hardness is frequently determined by strong intermolecular interactions, while the structure of solid materials under stress is more intricate. Scratch hardness, indentation hardness, and rebound hardness are a few other hardness measurements. The commonly used units for hardness measurement are:
- Brinell Hardness Number (HB)
- Vickers hardness number (HV)
- Rockwell hardness number (HRA, HRB, HRC, etc)
- Leeb hardness value (HLD, HLS, HLE, etc)
