Tempered glass is heat-treated to be about four times stronger than annealed (standard) glass, and it breaks safely into small, blunt pieces rather than large sharp shards. Annealed glass is cheaper but weaker and breaks dangerously. For almost any glass in a home or office – shower enclosures, partitions, table tops, doors – tempered is the safer choice. Here’s how the two compare.
Tempered vs annealed at a glance
| Feature | Tempered (toughened) | Annealed (standard) |
|---|---|---|
| Strength | ~4× stronger | Weaker |
| Breakage | Small, blunt granules (safe) | Large sharp shards (risky) |
| Cutting/drilling | Must be shaped before tempering | Can be cut and drilled |
| Cost | Higher (heat treatment) | Lower |
| Best for | Showers, partitions, doors, tabletops | Where strength/safety aren’t concerns |
Tempered (toughened) glass
Tempered glass is annealed glass that has been heat-treated to harden and strengthen it, which is why it costs more. It’s around four times stronger than annealed glass. Importantly, it cannot be cut or drilled once tempered – all shaping and fabrication must be done while the glass is still in its softer annealed state, and tempering is the final step. Beyond strength, its safe breakage pattern is the real advantage.
Annealed glass
Annealed (standard) glass is thermally treated and slowly cooled to relieve internal stress. It’s softer, cheaper, and tends to break into large pieces that can cause serious injury – so it’s used only where strength and safety aren’t concerns and cost is the priority.
Where tempered glass should be used
Most glass work should use tempered glass for safety: shower enclosures (sliding and swing), office glass partitions, windows, counter and table tops, pool glass fencing and glass doors. Even if it breaks, the small pieces pose far less danger. We use tempered glass for all such shower glass and partition work.
Frequently asked questions
Is tempered glass really 4 times stronger?
Yes – the heat-treatment process makes it roughly four times stronger than annealed glass of the same thickness.
Can tempered glass be cut to size after tempering?
No – it will shatter. All cutting and drilling must happen before tempering, which is always the final step.
Why is tempered glass safer?
It breaks into small, blunt granules instead of large sharp shards, greatly reducing injury risk.
When is annealed glass acceptable?
Only where strength and safety aren’t concerns and cost is the main factor.
Related reading: what tempered (toughened) glass is, glass usage in daily life.
Choose the right glass
For safe, durable glass in your home or office, IST Works L.L.C uses tempered safety glass as standard. Call +971-4-5645719, WhatsApp +971-54-3085166, or use the contact page.
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