Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Scratchability of Glasses

  1. Jul 23, 2012 #1
    Glass tables can be easily found in many dining areas. But people always complain that they are easily scratchable. Here my friend has tried to use normal plastic (which has very low hardness) to scratch the glass top, what I can observe is it actually give small damages to the surface...

    If according to Mohs Hardness Scale (Or some other theoretical tables), glass has higher hardness than normal plastics. But what are the reason behind this?

    I'm not an expert nor student in material science. Any explanation will be greatly appreciated.

    Thank you very much!
  2. jcsd
  3. Jul 23, 2012 #2


    User Avatar
    Gold Member

    You might look into the differences between Flint and Crown glasses. All glass is not
    created equal... There are lots of different formulations. Good luck.

    As an optician, I advised parents of young or very active children to opt for polycarbonate lenses instead of conventional plastic or glass, because the poly is very shatter-resistant. It scratches very easily, but is as tough as can be.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook