What type of glass is typically used in modern residential and commercial applications?

• A. Laminated glass
• B. Tempered glass
• C. Annealed glass
• D. Heat-strengthened glass

Answer: (D)

In modern glazing, the strength and safety characteristics of the glass are a key design decision. Heat-strengthened glass sits between ordinary annealed glass and fully tempered glass: it’s treated to add surface compression, giving it greater bending strength and better resistance to thermal stress than annealed glass, at a lower cost than tempered glass. This combination makes it a practical, commonly specified option when you want improved performance without the higher price or the particular breakage behavior of tempered glass. It often works well in many storefronts, interior partitions, and curtain-wall scenarios where the code allows this level of safety glazing and where extreme impact resistance or the specific break pattern of tempered glass isn’t required. Laminated glass and tempered glass serve other specialized goals—security or acoustic benefits, or where highest safety glazing is mandated—while annealed glass remains the baseline for non-safety uses.