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87 IITGN-UL/Façade 88 IITGN-UL/Façade

Event 7: Time: 16:33:56: (10.93 min)

Flashover occurs at ground floor during this period. Maximum temperature measured through thermal imaging at ground floor façade level is about 850°C
whereas at first floor level it is about 350°C.

Glass panels at first floor level undergo concave bending due to restraint provided by masonry at the edges. One of the panels shatter at first floor level.
Temperature at this instant is about 660°C at first floor level and about 750°C at ground floor level. 16:18:00 Ground floor First floor Second floor

Event 7: Time: 16:36:05: (13.08 min) -5 min Data acquisition begins

Flashover occurs at first floor level. Maximum temperature recorded during flashover at first floor level was about 845°C, whereas at ground floor level 0 min Wooden crib ignited through tray filled with gasoline as ignition source
current temperature is 380°C. Wooden crib placed at second floor level catches fire. Cement boards at both levels are intact thereby protecting beams and
slab from direct exposure of heat. 1 min Flames impinging cement boards. Max temp is around 135°C Temp at first floor level is about 25°C

Event 8: Time: 16:36:30: - 16:47:00 4 min Glass panels break due to restraining effect.
(24 min) Temperature increases to 625°C. Cement boards intact

Fire propagates internally to first floor
Fire extinguishing is initiated at ground and first floor level. Temperature at second floor level is about 320°C. 5.75 min due to premature failure of fire stop
During this interval, water is sprinkled on glass panels at second floor level. Three glass panels fall out in intact form from second level. Temperature
measured at this instant is about 750°C. Fire extinguishing is initiated at second floor level. Unlike other tests, glass panels undergo concave bending before Wooden crib at first floor catches fire Flames reach second floor
shattering within the installation. Temperature at ground floor is about 760°C through failure of fire stop

The timeline of events can be viewed in brief in Table 15.
10.93 min Flashover occurs during this interval. Temp reaches 850°C One glass panel shatters.
Temperature at this instant is about 660°C
Wooden crib at second floor
13.08 min Fire begins to die out Flashover occurs during this interval. catches. Cement boards at
Max temp recorded is 845°C
both levels are intact
24 min Fire extinguishing begins Fire extinguishing begins Fire extinguishing begins

Table 15: Timeline of events at all floor levels during fire Test 4