Physical and chemical properties: Linear expansion coefficient (@ 20/300 ºC): 3.3•10-6 K-1 Strain point: 520 ºC Annealing point: 560 ± 10 ºC Softening point: 820 ± 10 ºC Density: 2.23 ± 0.02 g/cm3 Hydrolytic resistance (according to ISO 719, water at 98 ºC): Class 1 Hydrolytic resistance (according to ISO 720, water at 121 ºC): Class 1 Resistance to acids (according to ISO 1776, DIN 12116): Class 1 Resistance to alkalis (according to ISO 695): Class 2 Typical composition: 80.4% in weight SiO2 13.0% in weight B2O3 4.2% in weight Na2O 2.4% in weight Al2O3
Made of borosilicate glass 3.3 It is used in products where chemical and mechanical resistance is to be combined with resistance to sudden temperature changes. This particular combination of properties makes this type of glass the most used in labware
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