Thursday, 11 February 2010

Properties of Some Basic Glass Types

Various types of glass have differing properties which make them suitable for a variety of applications. Some of the characteristics of three glasses are given here. The glasses are quartz, soda/lime, and lead crystal.

Quartz glassSoftening point (C) 1508
Annealing point (C) 1048
Strain point (C) 956
CoE (10-7 metres/degree C) 3.1
Density (kg/m3) 1973
Refractive index 1.459

Soda/Lime glass
Softening point (C) 693 - 732
Annealing point (C) 516 - 549
Strain point (C) 471 - 493
CoE (10-7 metres/degree C) 56 - 100
Density (kg/m3) 2203 - 2275
Refractive index 1.51 – 1.52

Lead glass
Softening point (C) 438 - 671
Annealing point (C) 366 - 527
Strain point (C) 343 - 449
CoE (10-7 metres/degree C) 47 - 55
Density (kg/m3) 2505 - 4867
Refractive index 1.54 – 1.75