Heat-Resistant Glass

1. Ordinary Glass (Soda-Lime Glass)
Temperature Resistance: Up to approx. 100°C
Characteristics: High thermal expansion; prone to cracking under rapid temperature changes. Not suitable for heating.
2. Tempered Glass
Temperature Resistance: Up to approx. 300°C (can withstand temperature differences up to 200°C)
Characteristics: High mechanical strength, better thermal shock resistance than ordinary glass, but cannot be used over open flames and has a risk of spontaneous breakage.
3. Borosilicate Glass
Temperature Resistance: Up to approx. 450°C
Characteristics: Very low thermal expansion, excellent thermal shock resistance (can handle rapid temperature changes). Commonly used for laboratoryware and tea sets.
4. Fused Silica / Quartz Glass
Temperature Resistance: Up to approx. 1200°C
Characteristics: High purity, extreme thermal stability, can withstand severe temperature gradients. Used in semiconductors and fiber optics.
5. Sapphire Glass
Temperature Resistance: Up to approx. 2000°C (Melting point: 2040°C)
Characteristics: Extremely hard (Mohs hardness 9), withstands ultra-high temperatures. Used in aerospace and high-end watch crystals.