Which glass type is formed by heating and cooling to increase its strength and is commonly used in windshields?

Which glass type is formed by heating and cooling to increase its strength and is commonly used in windshields?

• A. Tempered
• B. Laminated
• C. Wired
• D. Float

Answer: (A)

Tempered glass is formed by heating the glass and then cooling it rapidly. This rapid cooling puts the surface into compression while the inside remains under tension, which greatly increases strength and resistance to thermal shock. If tempered glass does fail, it breaks into small, dull fragments rather than sharp shards, enhancing safety. In vehicles, the standard windshield is typically laminated, meaning it has an interlayer that holds the glass together when cracked. That safety feature is why laminated glass is used for windshields, while tempered glass is more common for other glass surfaces like side windows where additional strength is needed. The other types differ in their construction and behavior: laminated includes a plastic interlayer, wired contains a wire mesh for strength, and float is basic annealed glass without the added surface compression.

Tempered glass is formed by heating the glass and then cooling it rapidly. This rapid cooling puts the surface into compression while the inside remains under tension, which greatly increases strength and resistance to thermal shock. If tempered glass does fail, it breaks into small, dull fragments rather than sharp shards, enhancing safety.

In vehicles, the standard windshield is typically laminated, meaning it has an interlayer that holds the glass together when cracked. That safety feature is why laminated glass is used for windshields, while tempered glass is more common for other glass surfaces like side windows where additional strength is needed. The other types differ in their construction and behavior: laminated includes a plastic interlayer, wired contains a wire mesh for strength, and float is basic annealed glass without the added surface compression.