I am designing a scratch resistant watch for my sophomore year-end project. My extensive research had shown that sapphire glasses are used widely in watch industry. Hence, I would like to ask what are the exact physical properties (numerical range) a scratch resistant watch should have and is there other alternative material that are similar to sapphire.
You are right. Sapphire is using in watch glass industry, as window (scratch resistant) because sapphire has a very high hardness (see About Sapphire chapter).
The alternative material is SiC (carborundum), but the dimensions of these crystals are more smaller than sapphire.
<<< back to Frequently Asked Questions List