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hard glass

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hard glass [′härd ¦glas]
(materials)
A potash-lime glass with a high silica content, used for making brilliant glassware. Also known as Bohemian glass.


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Back then, they were made of hard glass and caused many problems.
They transformed into hard plastic lenses some time after their beginning in the 1950s as hard glass lenses, both of which were uncomfortable and expensive.
 
 
 
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