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Defects of Tempering Stress (1)
Source : www.landglass.co    Release time:2013-10-12

1. The resistance against impact of tempered glass is low. 

Generally speaking, the resistance against impact of tempered glass is 5~8 times higher than that of the glass before tempering. Take 5mm thick tempered glass for example, it will not be broken if it is impacted by a steel ball weighs 227g falling freely 2~3 meters above, whereas the common glass in the same thickness will be broken by the same ball falling over 1 meter high. This is because that after tempering in the glass tempering furnace, the tempered glass has the even internal stress which can effectively strengthen the resistance against impact. If the resistance against impact of tempered glass can not meet the industrial standard, the reasons may be as follows: 

1) The heating temperature is set too high or the heating time is too long. After the cooling in the chiller, it forms over high internal stress, i.e. over-tempering. Such glass not only has a low resistance against impact, but also is liable to spontaneous breaking. The broken pieces are in a very small particle size; 
2) In the process of quenching in the chiller, over high cooling strength also may cause over high internal stress and result in over-tempering. 
Solutions: 
1) Reduce the set value of heating temperature or reduce the heating time when the glass is heated in the heating section of glass tempering furnace. (Suggestion: for the thick and large-breadth glass, it's better to adopt the properly low-temperature and long-time heating method); 
2) Reduce the quenching pressure of chiller or properly increase the chiller height.


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