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tempered glass

Production principle: tempered glass, also called quenched glass, is made by heating plate float glass close to the softening point of glass, 684 ℃ with rapid forced cooling on the surface of the glass, so that the compressive stress distribution on the surface of the glass. The tensile stress is in the central layer, so there is a strong and equal compression stress, so that the tensile stress produced by the external pressure is offset by the strong compressive stress of the glass, increasing the safety of glass use. It can be divided into: physical, chemical toughening.

 

We generally use physical tempering. Physical tempering is the cooling medium which does not produce any chemical reaction on the glass itself, and it is only a physical change method, the result of temperature stress.

 

Principle: the glass is heated below the softening temperature at a certain heating rate in the furnace. Then the glass is quickly fed into the cooling device and quenched by low temperature and high speed airflow. The outer layer of the glass shrinks and harms. As the thermal conductivity of the glass is small, the inner layer is still in a high temperature state. When the glass begins to harden, the hardened outer layer will prevent the inner layer from shrinking, thus making the first hardened outer layer produce compressive stress. The post-hardened inner layer produces strong stress. Because of the compressive stress on the glass surface, when the external force is made on the surface, the compressive stress must be offset first, which will greatly improve the mechanical strength of the glass. The glass that is physically treated like this is toughened glass.


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