1. The strength of tempered glass is 3 to 5 times that of ordinary glass, and its impact resistance strength can reach 200 to 300 megapascals.

2. The process of making tempered glass involves heating the glass to a temperature range of 620-650℃, and then rapidly cooling it down. 

3. The surface compressive stress of tempered glass typically ranges from 69 to 100 megapascals, which is the main reason for its high strength. 

4. When tempered glass breaks, it will form tens of thousands of small particles. There are approximately 40 to 400 fragments per square centimeter. 

5. The safety test for tempered glass requires that a 227-gram steel ball dropped from a height of 1.2 meters should not cause the glass to break. 

6. The thermal expansion coefficient of tempered glass is approximately 9×10^-6/℃, which is slightly higher than that of ordinary glass. 

7. Tempered glass can withstand a temperature difference of up to 250℃, while ordinary glass can only withstand a temperature difference of approximately 60℃. 

8. The bending strength of tempered glass can reach 120-200 megapascals, which is 4-5 times that of ordinary glass. 

9. The thickness of the laminated tempered glass used for the front windshield of a car is usually between 4 and 6 millimeters. 

10. During the manufacturing process of tempered glass, the cooling rate can reach over 100℃ per second.