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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.
An unbreakable plastic comb is a comb that, despite being made of plastic rather than (more expensive) metal, does not shatter into multiple pieces if dropped on a hard surface such as bathroom tiles, a hardwood floor, or a pavement. Such combs were introduced in about 1960. Today most plastic combs are unbreakable.