Franz von Holzhausen threw a steel ball against the side window of the Tesla Cybertruck and, while intended to distract her, broke it viral for the wrong reasons. Even though the window failed the ball test, Tesla will still install laminated glass on its truck. Thanks to newly granted patents, we now know more about how this multilayered glass works.
The patent states that it should withstand a 2 joule impact with only a 10 percent probability of failure (that is, it has an IK07 impact protection rating). This means that if a 0.5 kg (1.1 pound) mass falls on it from 40 centimeters nine times out of ten, it shouldn’t fail.
It works thanks to the use of several different panes of glass – the inner pane is chemically treated to improve its flexibility and strength, and it is bonded to the outer pane, which is made of borosilicate (glass, the boron oxide), by an adhesive layer (which has energy absorption properties) contains) and this is supposed to hold it against thermal shock.
According to TeslaratiThe patent suggests that Tesla’s reasoning for using this advanced type of glass has mostly to do with everyday use. The manufacturer will not equip the Cybertruck with it because they want occupants inside to be protected from actual projectiles that are fired at the vehicle. Instead, the aim is to prevent stone chips from occurring and thus extend the service life of the glass. This is especially true of the windshield, which is most susceptible to chips and which is difficult and expensive to replace.
We’re pretty sure that YouTubers who have ordered a cybertruck will be the first to shoot a gun at one of the windows. And the inevitable result will be that the glass will break because it is not so much bulletproof glass as it is armored glass, and the two terms are actually not interchangeable. For reference, the energy of a single 9mm shot is hundreds of joules. So unless a glass is specifically designed for this, we don’t really believe that Tesla’s Cybertruck glass will actually stop a bullet (although its thick stainless steel body could possibly do so).