Glass Properties and Applications

Most industrial glasses have linear thermal expansion coefficients between 30 10 /K (thermal shock resistant borosilicate gla.ss) and 80 to 90 lO /K (window gla.ss). In composite systems, such as used in the electronics industry for fusing (soldering) glasses to metal conductors or casing components, the thermal expansion coefficients of the glass and the metal have to be precisely matched. 

The density of most industrial glasses is between ca. 2.2 and 2.6 g/cm. The density can be considerably increased by incorporating atoms with high atomic weights. 

Glasses are purely elastic bodies at room temperature with elastic moduli between ca. 50 and 90 kN/mm. The flexural strength and tensile strength values (between 10 and 100 N/mm ) depend upon the quality of the surface. 

Glasses exhibit at room temperature specific resistances between 10 and 10 Qcm, which decrease significantly with increasing temperature. 

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Smith GP (1967) Photochromie glasses properties and applications. J Mater Sci 2 139-152... 

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