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By itself, glass is in fact always breakable. Glass, by its definition is made out of materials that can at least crack. The only exception to this is when a hybrid material is made such as plexi-glass. This type of material can in fact be unbreakable, but it is not considered glass.nswer by Desine (427). There is no unbreakable anything. Under sufficient stress, anything can break. Glass is made safer not by making it unbreakable but by making it break into safer pieces.
Type Use the correct type of glass. When heating glassware, make sure to use only glassware made of borosilicate glass (PyrexÂ® brand or KimaxÂ® brand). Common glass can break, explode or shatter very easily when subjected to heat shock. Make sure to use test tubes made of borosilicate glass when heating. Not all test tubes are made of borosilicate glass. Proper Use Each type of glassware has its proper use and should be used only for its intended purpose.