Material Selection Requirements

• Wear resistance can be important for functional as well as aesthetic reasons.
  
  
• If wear reduces the cross section of a loaded part it may eventually fail.
  
  
• Scratch resistance is of critical importance for lenses, such as eye glasses.
  
  
• The hardness properties of materials are used to compare indentation resistance and not abrasion resistance.
  
  
• Typical hardness tests are "Rockwell hardness test" and the "Durometer test".
  
  
• Indentation resistance may not correlate with abrasion, scratch, or wear resistance.
  
  
• A common test method used to measure abrasion resistance is the "Tabor abrasion test" which measures loss of volume/weight as the result of a specific abrasion process.