What is Annealed Glass?
Annealed glass is basic float glass that is slowly cooled after production to reduce internal stress. It is cheap but breaks into large sharp shards that can cause serious injury, and not suitable for safety applications.
What is Tempered Glass?
Tempered safety glass is heat treated to be 4-5 times stronger than annealed glass. When broken, it shatters into small blunt granules that are much less likely to cause injury, making it required by building codes for doors, windows, shower screens and facades.
Key Differences
- Strength: tempered glass is 4-5x stronger than annealed
- Safety: tempered breaks into small granules, annealed into sharp shards
- Heat resistance: tempered can withstand 250°C temperature difference
- Price: tempered is about 2-3x more expensive than annealed
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