Basic properties of tempered glass by physical method
Tempered glass has higher mechanical strength.
1. the impact strength of tempered glass is 5-8 times that of ordinary glass.
2. the bending strength of tempered glass is 4-5 times that of ordinary glass.
3. toughened glass has higher static strength.
Tempered glass has good thermal stability.
Thermal stability is the ability of glass to withstand severe temperature changes without breaking. The thermal stability of tempered glass is expressed by the difference of temperature that it can bear. The difference of temperature that ordinary glass can bear is about 70-100 degrees centigrade. The difference of temperature that tempered glass can bear is about 250-320 degrees centigrade. The thermal stability of tempered glass is 1.5 times higher than that of ordinary glass.
Tempered glass has high safety.
The toughened glass is of high strength and is not easy to be destroyed, and when broken, the fragments are like honeycomb-shaped small obtuse-horned particles, which are not easy to injure people and are safe. The general glass strength is low, broken pieces of large and sharp, sharp as a knife, very vulnerable to injury, low safety.
No toughened glass can be cut again.
It is difficult to cut toughened glass by general cutting method because of the uniform distribution and balanced stress in the toughened glass.
Crack characteristics of tempered glass after crushing
When toughened glass is destroyed, the surface of the fragments is smooth, an aggregate of many cracks, causing small pieces of glass to gather together.
Together, this is a characteristic of ordinary glass, which, when broken, is completely separated into separate pieces.
Tempered glass has the characteristic of "self explosion".
Self detonate is the automatic explosion of tempered glass under the action of no direct mechanical external force. It can occur during the process of toughening or preservation.
The causes of self ignition of tempered glass are mainly as follows:
1. the effect of glass quality defects.
L glass contains stone impurities.
L glass contains nickel sulfide (NIS) crystal.
L glass contains bubbles.
L Glass surface in the process of processing due to improper operation caused scratches, notches, deep explosion edge and other defects, easy to cause stress concentration and lead to tempered glass spontaneous explosion.
2. The uneven and asymmetrical heating or cooling of tempered glass during tempering may easily cause uneven stress in glass.
Uniform and cause self detonate.
3. the greater the stress of glass, the higher the degree of tempering, the more likely to cause self detonate.