Structural Performance Test Report
LABORATORY CERTIFICATION NO: 94-0323-47
TEST SPECIMEN: Eight (8) 40" wide by 40" high Fixed Lites Using Various Attaching Methods on Glass Surfaces.
TEST SPECIFICATION: ASTM E 330-93, "Test Method for Structural Performance of Exterior Windows, Curtain Walls and Doors by "Uniform Static Air Pressure Difference".
TEST SPECIMEN DESCRIPTION
The specimens tested measured 40" wide by 40" high overall. Each specimen was constructed of polyvinylchloride (PVC) surround members (CertainTeed Bottom Sash Frame) with welded mitered corner construction. The specimens used 3/32" clear annealed glass that was exterior drop in glazed using an adhesive tape back bedding and a dual durometer glazing bead. The following results were obtained.
Note No. 1: At
98.8 psf (196 mph) the glass shattered.
(film over viewing area only)
Note No. 2: At 72.8 psf exterior pressure the glass shattered but stayed in the confines of the frame. Reapplied pressure and at approximately 60 psf the glass edge deglazed from adhesive tape back bedding. (glass surface remained bonded by the film).
At this point in testing it was decided to take the specimens directly
(silicone bead at interior perimeter)
Note No. 3: At 74.3 psf exterior pressure the glass shattered. At this point 2 mil. plastic was applied over exterior surface to seal any openings and the load was reapplied.
Result: At 28.6
psf the glass deglazed from adhesive tape back bedding at the top rail.
(clear poly tape bridging the exterior frame perimeter)
Note No. 4: At
90.4 psf exterior pressure the glass shattered and deglazed from frame
at the right stile.
(clear poly tape bridging the interior frame perimeter and capped with #1 silicone)
Note No. 5: At
78.0 psf exterior pressure the glass deglazed from left stile corner to
midspan of the top rail.
(Identical to No. 5 only using #2 silicone cap)
Note No. 6: At
104 psf exterior pressure the glass shattered but remained employed in
the surrounding members. Stopped test at 187 psf (270 mph) no deglazement
Note No. 7: At
88 psf exterior pressure the glass deglazed at the top rail.
Note No. 7: At
60 psf exterior pressure the glass deglazed at the top rail.
Conclusion: In each case the film applied to the glass held the glazing surface intact. Each test that failed resulted in a deglazement failure from back bedding.