Safety glazing is a method of making windows safer for users. It is a crucial element in window installation, and there are several types of safety glazing methods, each with its own function and process.
In this article, we will provide an overview of safety glazing and when to use it. We will also explore the four types of safety glazing and their functions.
What is Safety Glazing?
Safety glazing, or the method of creating safety glass, is designed to ensure that the glass is much safer for the user. It has two functions.
The first function is making windows harder to break, reducing the chance of accidents and the potential harm that follows; however, if the glass breaks, the second function comes into play, where the safety glass breaks in a less dangerous way.
The two methods of creating safety glass are sandwiching a thin piece of plastic between two sheets of glass and having them laminated or strengthening the glass via heat treatment. This makes the glass harder to break, but when it breaks, it shatters into very small pieces instead of large, dangerous shards.
Overall, there are four main types of safety glass: tempered, laminated, wired, and bulletproof.
Tempered Glass
Tempered glass is a type of safety glass processed through controlled thermal or chemical treatments to increase its strength compared to regular glass. The tempering process involves heating the glass to a very high temperature and then rapidly cooling it. This creates internal stresses within the glass, increasing its strength. As a result, tempered glass is much more resistant to breakage than untreated glass.
However, when tempered glass does break, it breaks into small pieces rather than large sharp ones, preventing users from getting cut. This property makes it suitable for use in applications where safety is a concern, such as in car windows, shower doors, glass doors, and glass tabletops. Tempered glass is also commonly used in electronic devices like smartphones and tablets to protect the screens from damage.
Laminated Glass
Laminated glass is a type of safety glass made by sandwiching a thin piece of plastic. In this case, it is PVB plastic between two or more layers of glass. The layers are bonded using heat and pressure, resulting in a single, solid piece of glass.
The primary characteristic of laminated glass is its ability to remain intact even when broken. The glass may crack when impacted, but the plastic layer holds the broken pieces together, preventing them from separating or shattering. This property makes laminated glass highly resistant to penetration and protects against injuries and intrusions.
Laminated glass is commonly used in applications where safety and security are paramount, such as in car windshields, building facades, overhead skylights, and hurricane-resistant windows. Additionally, it offers benefits such as sound insulation and UV protection, making it suitable for various architectural and automotive purposes.
Wired Glass
Wired glass is a type of safety glass that contains wire mesh embedded within the glass during manufacturing. The wire mesh helps to hold the glass together in case of breakage, preventing it from shattering into large, sharp pieces. Wired glass was historically used in applications where fire resistance and safety were important, such as in fire doors, windows, and partitions
While wired glass does provide some level of impact resistance and fire protection, it has several drawbacks compared to modern safety glass options like tempered or laminated glass. One significant issue is that the wire mesh can create weak points in the glass, making it more prone to breakage upon impact. Additionally, the wire mesh can obstruct visibility and is considered less aesthetically pleasing than clear glass.
Due to these limitations and advancements in glass technology, the use of wired glass has declined in recent years. In many jurisdictions, building codes now require safer alternatives like tempered or laminated glass in areas where wired glass was traditionally used.
Bulletproof Glass
Bulletproof glass is a specialized type of glass designed to withstand the impact of bullets or other fast-moving projectiles. It is typically made by layering multiple sheets of glass and polymer interlayers via lamination. The layers are bonded under heat and pressure to create a solid pane. The addition of other layers, like ceramics, can further reinforce the glass, depending on the level of protection needed.
Bulletproof glass is commonly used in applications where security is critical, such as bank teller windows, government buildings, and jewelry stores.
Conclusion
To conclude, the two most common safety glass types are laminated and tempered. Wired glass is fading in popularity, and bulletproof glass is used in very specific and specialized cases.
Of the two common ones, tempered glass focuses on heat resistance and breaking safely but is not ideal for security, while laminated glass is generally more versatile.
If you want to get into more details regarding safety glazing and keeping up to code, 2018 International Building Code (IBC) – CHAPTER 24 GLASS AND GLAZING – SECTION 2406 SAFETY GLAZING covers safety glazing requirements.
How Vistaza can help
As a window company, Vistaza has extensive knowledge and experience in both window materials and installation procedures.
Selecting the right window means having the right window for security and keeping up with local codes. Feel free to discuss options with our experts to discover the optimal choice for your project.
