Fire retardant safety glass

Details Fire retardant safety glass Fire retardant safety glass

1994-08-01

1997-08-12

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 64, 501 67, 65114, C03C 3087, C03C 3095

Patent

active

056565585

ABSTRACT:
Hard glass fire retardant glasses can be tempered in a conventional air tempering plant having heat transmission values of approximately 200-500 W/(m.sup.2 .times.K) yielding in the tempered state a fire resistance period of at least 30 minutes according to DIN 4102 and the safety properties according to DIN 1249 (safe break). In order to achieve the combination of fire resistance period and safety properties, the glasses must have a coefficient of thermal expansion .alpha..sub.20/300 of between 3 and 6.times.10.sup.-6 K.sup.-1, a specific thermal stress .psi. of between 0.3 and 0.5N/(mm.sup.2 .times.K) , a glass transitione temperature Tg of between 535.degree. and 850.degree. C., a product of specific thermal stress .psi. multiplied by (Tg -20.degree. C.) of between 180 and 360N/mm.sup.2, an upper annealing temperature (temperature at a viscosity of 10.sup.13 dPas) of over 560.degree. C., a softening temperature (temperature at a viscosity of 10.sup.7.6 dPas) of over 830.degree. C. and a working temperature (temperature at a viscosity of 10.sup.4 dPas) of below 1300.degree. C.

REFERENCES:
patent: 3673049 (1972-06-01), Giffen et al.
patent: 3984252 (1976-10-01), Kiefer
patent: 4298388 (1981-11-01), Sack
patent: 4396682 (1983-08-01), Mohri et al.
patent: 4640900 (1987-02-01), Kokubo et al.
Chemical Abstracts, vol. 77, No. 20 (129954h), Nov. 13, 1972.
Chemical Abstracts, vol. 103, No. 2 (10373h), Jul. 15, 1985.
Chemical Abstracts, vol. 106, No. 20 (161428t), May 18, 1987.
Chemical Abstracts, vol. 106, No. 24 (200648m), Jun. 15, 1987.

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