Some characteristics of common glasses 3.11.2



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3.11.2 Some characteristics of common glasses

Glass	Approximate composition	Annealing temperature/ °C	10⁶ × linear coefficient of expansion
Soda (S95) .	Sodium calcium silicate	515	9.2^†
Lead (L92) .	Lead silicate	435	9.0^†
Pyrex . . .	Sodium aluminium silicate	530–600	3.2
Silica . . . .	Silica	—	0.45
GEC B₃₇ . .	Silica, boron, sodium	560	3.7^‡
Monax . . .	Silica (small amounts of sodium potassium, zinc and aluminium)	560	4.4^§

       ^† Suitable for sealing to platinum.
       ^‡ Suitable for sealing to tungsten.
       ^§ Suitable for sealing to platinum, tungsten and molybdenum, also impermeable to liquid helium.

For further information see W. E. S. Turner (1954) The Elements of Glass Technology for Scientific Glass Blowers (Lampworkers), The Glass Delegacy of the University of Sheffield, Sheffield, and J. H. Partridge (1949), Glass-to-Metal Seals, The Society of Glass Technology, Sheffield. For information on the properties of American glasses see W. E. Barr and V. J. Anhorn (1959), Scientific and Industrial Glass Blowing and Laboratory Techniques, Instruments Publishing Company, Pittsburgh.

E.F.G. Herington

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