Serving all Illinois and Wisconsin

Is Tempered Glass Heat-Resistant?

Updated: 05/31/2024

In the realm of glass products, it’s important to understand the nuances of heat resistance when selecting the right material for various applications.

When considering those where heat resistance is crucial, such as in kitchen environments or near fireplaces, tempered glass is preferred over annealed glass because of its higher tolerance to thermal stress.

Apex Tempered Glass explains what makes tempered glass heat-resistant, when you need heat-resistant glass, why tempered glass is generally better than regular glass, and what are the heat resistance characteristics of other glass types. Let’s dive into this topic!

What Is Tempered Glass?

What Is Tempered Glass?

Tempered glass, often referred to as toughened glass, is a type of safety glass renowned for its enhanced strength and durability.

Through a specialized process, it becomes significantly stronger than untreated glass of the same thickness and obtains heat resistance.

Due to its added strength and safety features, tempered glass is widely used in applications that need resilience to impact and thermal stress. Common applications include building facades, doors, windows, glass railings, shower enclosures, etc.

What Makes Tempered Glass Heat-Resistant?

Tempered glass gains its heat resistance through a specialized tempering process. During production, the glass is heated to high temperatures exceeding 600°C (1112°F) and then rapidly cooled. This rapid cooling induces surface compression and internal tension, resulting in a glass that’s more resistant to thermal stress.

This means that tempered glass can withstand higher temperatures – up to 250°C (482°F) without breaking or shattering compared to untreated glass.

When Do You Need Heat-Resistant Tempered Glass?

You may need heat-resistant tempered glass in various situations where exposure to high temperatures is expected or possible. Examples include:

  • Kitchen environments: for glass cookware, oven doors, and kitchen backsplashes.
  • Fireplace surroundings: for fireplace doors, screens, and heat shields.
  • Industrial settings: for machinery enclosures, furnace windows, and high-temperature processing equipment.
  • Automotive applications: for car windows, sunroofs, and windshield panels subjected to intense sunlight and engine heat.
  • Outdoor installations: for glass patio tables, outdoor fire pits, and grill enclosures.

In these scenarios, heat-resistant tempered glass ensures safety and longevity by withstanding thermal stress without compromising structural integrity.

How Else Is Tempered Glass Better than Regular Glass?

Aside from its heat resistance, tempered glass offers several other advantages compared to regular glass:

Qualities Description
Strength and Durability Tempered glass is approximately four to five times stronger than untreated glass of the same thickness. This increased strength makes it more resistant to impact, bending, and scratching, reducing the risk of breakage and extending its lifespan.
Safety When tempered glass does break, it shatters into small, blunt fragments instead of sharp, jagged shards like regular glass. This reduces the risk of injury in case of breakage, making it ideal for applications where safety is a concern.
Thermal Resistance In addition to being heat-resistant, it also exhibits better resistance to sudden temperature changes, known as thermal shock. This makes it suitable for environments where temperature variations are common.
Versatility Tempered glass can be customized in terms of size, shape, and thickness to suit a wide range of applications. It can be used in various architectural, automotive, and industrial settings.
Code Compliance It often meets or exceeds building code requirements and safety standards, making it a preferred choice for applications where regulatory compliance is necessary.

Overall, the combination of strength, safety, thermal resistance, versatility, and compliance makes tempered glass a better choice for many applications compared to regular glass.

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*We serve the Illinois and Milwaukee area.

What Are the Heat Resistance Characteristics of Other Types of Glass?

What Are the Heat Resistance Characteristics of Other Types of Glass?

Annealed Glass

Annealed glass is the most basic form of glass. It’s produced by cooling molten glass on a flat surface.

Annealed glass has relatively poor heat resistance compared to other types of glass. It can withstand temperatures up to around 120°C (248°F) before it starts to soften and deform.

Frosted Glass

Frosted glass undergoes a process where one surface of the glass is chemically etched or sandblasted to create a translucent appearance.

Frosted glass has heat resistance properties similar to annealed glass since the frosting process does not alter the glass’s thermal characteristics. It can withstand temperatures up to around 120°C (248°F) before softening.

However, frosted glass is versatile and easy to clean, maintain, and customize. It offers a level of privacy by obscuring visibility while still allowing light to pass through. It also diffuses light, reducing harsh glare and creating a softer, more comfortable environment, and adds a stylish and modern touch to any space.

Laminated Glass

Laminated glass consists of two or more layers of glass bonded together with an interlayer of polyvinyl butyral (PVB) or ethylene-vinyl acetate (EVA).

Due to its layered construction, laminated glass offers good heat resistance. It can withstand temperatures similar to tempered glass, around 250°C (482°F), before showing signs of softening.

Heat-resistant laminated glass can be used in different applications, such as building facades, skylights, overhead glazing, curtain walls, balustrades, automotive windshields, etc.

Heat-Strengthened Glass

Heat-strengthened glass is a type of heat-resistant glass that undergoes a similar heating and cooling process to tempered glass, although with less intensity.

This results in glass that’s stronger than annealed but weaker than tempered. It can typically handle temperatures ranging from approximately 120°C to 200°C (248°F to 392°F).

While not as robust as tempered glass, heat-strengthened glass is still a viable option for applications where moderate heat resistance is required, such as in building facades, curtain walls, and structural glazing.


Tempered glass stands out as the preferred choice for applications where heat resistance is important. Apex Tempered Glass manufactures high-quality tempered glass with shatter-resistant properties, focusing on your safety as a number-one priority. With a fast turnaround time and free delivery and installation, you can’t go wrong with our services!

We also create laminated, frosted, patterned, and custom cut glass, offering you customizable glass features, fast turnaround, and reasonable pricing. Contact us to get a free quote.

Nina Tsoy

Finance And Operations

Nina leads Apex Tempered Glass, a company specializing in manufacturing all types of glass. Known for her strategic expertise and exceptional operational performance, Nina is committed to providing innovative solutions for any glass-related issue.


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*We serve the Illinois and Milwaukee area.