What’s the Difference Between Tempered, Laminated, and Toughened Glass?

Posted: October 8, 2025

Understanding the key differences between tempered, laminated, and toughened glass

When it comes to selecting the right type of safety glass for residential, commercial, or industrial applications, understanding the difference between tempered, laminated, and toughened glass is essential.

At Instant Glass and Glazing, servicing London and Southeast England, we provide high-performance glazing solutions that combine durability, safety, and aesthetic appeal.

Each type of glass has unique characteristics that make it suitable for different applications.

Tempered Glass: Strength and Thermal Resistance for High-Impact Use

Tempered glass, also known as toughened glass, is a type of safety glass processed by controlled thermal treatments to increase its strength compared to normal glass

How It’s Made

Tempered glass is produced by heating standard annealed glass to over 600°C, then rapidly cooling it using high-pressure air jets. This process causes the outer surfaces to cool and contract faster than the centre, inducing compressive stress on the surface and tensile stress internally.

Key Characteristics

• Up to five times stronger than regular glass
• Breaks into small, blunt fragments rather than sharp shards
• Can withstand rapid temperature changes (thermal shock)
• Highly resistant to impact and pressure

Ideal Applications

Tempered glass is widely used in: Shower enclosures
Commercial facades
Balustrades
Doors and windows
Oven and stove doors
Interior partitions

Laminated Glass: Superior Security and Sound Insulation

Laminated glass is a safety glass composed of two or more layers of glass bonded with a tough interlayer, typically polyvinyl butyral (PVB) or ethylene-vinyl acetate (EVA).

This design ensures the glass holds together even when shattered.

How It’s Made

Laminated glass is created by placing an interlayer between sheets of glass, then applying heat and pressure to form a single unit. The process enhances durability while maintaining transparency and strength.

Key Characteristics

• Holds together when broken, reducing injury risk
• Blocks up to 99% of UV radiation
• Excellent sound insulation properties
• Customisable for security, decorative, or solar control purposes
• Meets BS EN 14449 and BS EN 356 standards for security glazing

Ideal Applications

Laminated glass is best suited for: Skylights and overhead glazing
Automotive windshields
Bank and retail storefronts
Soundproof windows
Bullet-resistant or impact-resistant glazing

Toughened Glass: Synonymous with Tempered Glass – But What’s the Real Difference?

There’s a common misconception that toughened glass is different from tempered glass.

In reality, the terms are interchangeable, particularly in the UK and EU markets. However, in some technical contexts, "toughened" may refer to a broader category of heat-strengthened glass types.

Toughened vs. Heat-Strengthened Glass

While both undergo thermal treatments:

• Toughened (Tempered) Glass breaks into small, blunt pieces and is suitable for safety applications.
• Heat-Strengthened Glass is only partially tempered, making it twice as strong as annealed glass but not a safety glass under British or European standards.

Why Terminology Matters

In the UK glazing industry, "toughened glass" is widely understood to mean fully tempered safety glass that meets BS EN 12150 compliance.