Designed to withstand strong winds greater than 250 km/hr and in extreme adverse environmental conditions. Its structure is composed of a special transparent polymer SentryGlas® placed between two glasses. It is capable of absorbing impacts from objects shot by strong wind gusts and preventing them from passing through windows.
For a glass to be considered hurricane resistant, it must meet the following three requirements:
- 3 second gusts of 234 km/h with resulting pressures/suctions per ASCE 7 (approx. 450 kg/m2) without fracturing.
- Three Level A Impacts (small missile impact) – for heights greater than 9.1 m
- Two Level D impacts (large missile impact) – for heights up to 9.1 m
- In this test the glass can fracture, but it can NOT penetrate the impacted object. The glass MUST NOT have any openings.
Once the glass is fractured, it must withstand a final test of:
- 9000 cycles of wind pressure and suction of 440 kg/m2, equivalent to 305 km/hr, this represents sustained winds.
- ASTM E 1996 defines 5 levels of impacts.
- Small missile (Level A) 10 steel pellets of 8 mm (2 grams) each, impacting at 143 km/h.
- Large missile (Level B) 0.91 kg wooden spear, impacting at 55 km/h.
- Large missile (Level C) 2.05 kg wooden spear, impacting at 44 km/h.
- Large missile (Level D) 4.10 kg wooden spear, impacting at 55 km/h.
- Large missile (Level E) 4.10 kg wooden spear, impacting at 88 km/h.