What do you call the capability/capacity of an object to stay exposed in fire?

Question

what property is important for glassware that is heated?

Answer 1

Fire rated.

It can be 1 hour fire rated.

2 hours fire rated and so on...

Answer 2

fire resistant?

probably not what you are looking for.. but thats all I can find.

pyrex is the glassware that can handle being exposed to fire.

the properties that make pyrex fire resistant are its low density, high softening point, high strain point, high annealing point, low refractive index, and low coefficient of expansion. (low or high in comparison to "normal" [kimble flint in this case] glass)

more info: Chemical Technicians' Ready Reference Handbook

By Gershon J. Shugar, Jack T. Ballinger

pg 357 (online link shown below)

hope that is of some help! :)