Borosilicate glass is also very noticeably lighter than normal soda-lime glass. After you have handled both kinds of glass it is difficult to confuse them, esp

Borosilicate glass is also very noticeably lighter than normal soda-lime glass. After you have handled both kinds of glass it is difficult to confuse them, especially in bigger vessels. Besides the fact that borosilicate glass has a lower density, the vessels made of borosilicate glass are made typically with thinner walls than those made of normal glass, which makes even greater the weight difference.