With tempered glass, spontaneous
breakage can occur occasionally resulting from inclusion of materials
nickel sulfide. These inclusions are inherent to in the production process.
When the window breaks,
the tempered glass splinters into numerous pieces,
which can fall out of the opening either wedged together
or as individual
pieces. Although the risk of spontaneous breakage is usually minimal, planners
alternatives into consideration, where applicable. We recommend
heat-strengthened glass, for which such
cases of spontaneous breakage are
unknown. In areas, for which tempered glass is mandatory, we can
additional heat soak tests on the tempered glass. When nickel sulfide
inclusions are heated, their volume can
increase. If this happens, small
transverse forces can then lead to spontaneousbreakage. Heat soaking
this heat up and expansion process.
The heat-soak test consists in heating
the tempered glass at 290°C for 8 hours.
If inclusions are present, breakage is
far more apt to occur during heat soaking than later at the installation site.
Nevertheless, heat soaking is not an
absolute guarantee that tempered glass cannot break after it is installed.
However, this process does significantly decrease the probability of
spontaneous breakage resulting from
nickel sulfide inclusions