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Knowledge of building energy saving -- glass

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What is semi tempered glass?

Semi-tempered glass, also known as heat-enhanced glass. Semi-tempered glass is situated between a kind of product between ordinary flat glass and aluminum tempered glass window. It has some advantages of tempered glass. If the strength is higher than ordinary float glass, it is 2 times that of normal float glass. At the same time, it avoids the poor flatness of tempered glass, easy to blow itself up, once the damage is the overall smash, etc. is not as good as the shortcomings. When the semi-tempered glass breaks, radial cracking occurs radially along the crack source, generally without tangential crack propagation. So after the destruction, the general condition it can still maintain the overall not collapse.

Monolithic  semi tempered glass (heat enhanced glass) does not belong to safe glass. Once it breaks, it will form large fragments and radial cracks. Although most of the debris do not have sharp sharp corners, they will still hurt people and cannot be used in sunroofs and an occasion for a possible physical collision.

What is tempered glass?

Tempered glass is a safety glass. Tempered glass is actually a kind of prestressed glass. In order to increase the strength of glass, chemical or physical methods are usually used. Formed in the glass surface pressure should offset the surface stress of force bearing capacity of glass, so that the carrying capacity is improved, the wind pressure resistance of the glass itself is improved, and the cold and heat resistance and the impact are improved etc..

The advantages of tempered glass:

1. Safety

When the glass is destroyed by an external force, the fragments are broken into small, obtuse-angle particles resembling honeycombs, which are not likely to cause harm to the human body;

2. High strength

The impact strength of the tempered glass of the same thickness is 3~5 times that of the ordinary glass, and the bending strength is 3-5 times that of the ordinary glass.

3. Thermal stability

Tempered glass has good thermal stability, the temperature difference that can bear is 3 times that of the ordinary glass, and can withstand temperature changes of 200 °C.

The disadvantages of tempered glass:

1. After tempering, the glass can not be cut and processed again. The glass can only be processed to the required shape before the steel is tempered, and then the steel is tempered.

2. Tempered glass is stronger than ordinary glass, but tempered glass has the possibility of self-detonation (self-breaking) when the temperature difference changes greatly, and common glass does not have the possibility of self-explosion.

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