Expanded riolite glasses and a process for the preparation there

Details Expanded riolite glasses and a process for the preparation there Expanded riolite glasses and a process for the preparation there

1974-11-13

1976-10-19

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106DIG2, C03B 0000

Patent

active

039868834

ABSTRACT:
The invention relates to expanded products made from riolite glasses with a natural water content of at least 4 % by weight, as well as to a process for the preparation of such products. When preparing these expanded products a granulometric fraction of 0.3 to 3.0 mm. of the natural riolite glass is subjected to a heat treatment at 220.degree. to 400.degree. C for at least one hour, to reach a residual water content of 1 to 4 % by weight, and the obtained partially dehydrated substance is expanded at 800.degree. to 1300.degree. C. This way expanded products with high quality can be obtained.

REFERENCES:
patent: 2021956 (1935-11-01), Gladney
patent: 2243027 (1941-05-01), Baker
patent: 2902379 (1959-09-01), McCollum
Hackh's Chemical Dictionary-4th Ed.-pub. NYC, McGraw Hill 1969-pp. 719-720.
Lacy, E. D.-"The hydration and dehydration of aluminosilicate glasses"-Chem. Abstracts vol. 68 (1968) pp. 578-579.

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