I want to implement a piece of glass to set various pieces of steel on and take picture through it.
The pieces of steel weigh anywhere between 20-150 lbs.
The purpose of the glass is so pictures can be taken of both sides of the piece at the same time to speed up production instead of having to flip it over by hand.
I'm no expert in this, but I am assuming there are many different compositions of glass as there is steel. According to Wikipedia, steel has a hardness of 4-4.5 and glass has a hardness of 5.5. I don't know how true this holds, which is why I'm here.
So what this boils down to is I'm looking for a sheet of glass that will with stand weights over 150 lbs and won't be scratched by constant pieces of steel being laid on it.
This question could be as easy as "All glass will work" but I've seen glass on cars that have been scratched and gouged by other parts, so I wasn't sure how true the Mohs scale I saw was.
Another problem I have thought about is which is better, Anti-Glare or Anti-Reflection. I would like to try and keep a high quality picture through the glass.
EDIT Here is a picture as requested.