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Chapter: 3 Chemistry
    Section: 3.11 Miscellaneous data
        SubSection: 3.11.2 Some characteristics of common glasses

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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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