Technical guide
Laminated vs toughened glass
Toughened glass is stronger before it breaks and disintegrates into blunt granules when it does. Laminated glass is weaker on impact but holds together on its interlayer, keeping the opening closed and the building secure.
- Free measured site survey
- Fixed written quotation
- Mainland UK coverage
- Commercial specialists only
- 24-hour emergency response
Strength before failure
Toughened is four to five times stronger than annealed glass of the same thickness. Laminated is closer to annealed in raw impact strength, though the interlayer adds meaningful resistance to penetration.
Behaviour after failure
This is the real decision. Toughened clears the opening completely and instantly. Laminated cracks and stays in place, which is why it is mandatory overhead and strongly preferred at street level.
Security
Toughened offers effectively none once struck. Laminated resists a sustained attack because each blow only damages one layer. Attack-resistant grades tested to BS EN 356 extend that considerably.
Cost
Laminated typically runs 30–60% more than toughened of equivalent nominal thickness. On a shopfront that difference is usually recovered the first time the glass is attacked.
Where each belongs
Toughened: internal partitions, protected positions, above head height where nothing can fall through. Laminated: overhead, street level, balustrades, anywhere a fall or a break-in is possible.
Need this checked on a real building?
Send the details and we will tell you what applies.
Related services
Where this applies
Toughened & laminated safety glass
Safety glass is glass that fails without causing serious injury.
Glass balustrades
A glass balustrade is a protective barrier where a fall is possible, built from laminated toughened glass either clamped in a base channel or fixed on standoffs.
Commercial shopfronts
A commercial shopfront is the glazed street elevation of a retail or hospitality unit, normally thermally broken aluminium framing with toughened or laminated safety glass, an accessible entrance door and, on most units, a security shutter or grille.
Tell us what the building needs
Free measured survey, fixed written quotation, and a straight answer about what is and is not worth doing. Mainland UK, commercial work only.