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<p>[QUOTE=&quot;physics-fan3.14, post: 4002738, member: 19165&quot;]Every few years, the TPGs update their slabs to make them clearer, more scratch resistant, stronger, etc. They also have experimented with different coatings. </p><p><br /></p><p>Glass would be bad because, as mentioned, it is too fragile. Imagine how easily your phone shatters - would you want a coin in that? </p><p><br /></p><p>And, the exact type of plastic they use is a trade secret. They won&#039;t tell you.[/QUOTE]</p><p><br /></p>

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