| The increased use of glazing in buildings, together with building code requirements in the fire-rated glass sector which have seen rapid changes, have lead to the development of new types of fire glasses. |
 Generally, any type of glass that can withstand the fire test and therefore resist passage of smoke, flames and hot gases, is considered "fire-resistant glass". These glasses are then further categorised and rated according to special criteria. Typically, the rating is based on how long a particular type and size of glass will withstand fire. Classifications range from 20 minutes up to 3 hours.Ordinary flat glass cannot withstand extreme temperatures, and breaks at around 120° C. Fire-resistant glass must be able to withstand 870° C for a selected period of time and remain in its frame. Immediately following this extreme heat, the glass is exposed to ?The Hose Stream Test?. In this test, water is used to rapidly cool the hot glass to test its ability to withstand thermal change. The purpose of this test is to test a real situation in which water from a sprinkler system shatters glass intended to function as a barrier, and thus permits smoke and fire to spread and escalate to the next level. The three most important factors in connection with the choice of fire-protection glass are: - type of protection (class E- and class EI) - duration of protection (e.g. 15, 30 or 60 minutes), - frame construction to be used (wood, aluminum or steel). Class E involves protection against smoke and flames while class EI also offers protection against fires spreading heat radiation. On the market today they are several fire-resistant glass products such as wired glass, ceramic glass, fire-rated tempered and special laminated glass. |
article source http://www.glassonweb.com |
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