[China Glass Net] Semi-tempered glass is also heat-enhanced glass, but the cooling rate after heating is low, and the surface stress is less than 70N/mm2. Semi-tempered glass for curtain wall, surface stress 45N/mm2-54N/mm2.
The semi-tempered glass has a low surface stress and does not exhibit self-explosion. Due to the heat enhancement, the strength of the semi-tempered glass is twice that of ordinary float glass, and it has a high resistance to temperature change, and also greatly improves the impact resistance, and is not easily broken due to sudden temperature changes or human impact. Even if accidentally broken, the cracks do not cross, and the formed radial cracks reach the edge. Because the edges are glued or framed, the glass fragments are not easily dropped.
"Before 2003, the curtain wall project in China was based on the successful experience of foreign countries. It also used semi-tempered glass extensively and achieved good results. It has been used for more than 10 years and has not been seen because the curtain wall semi-tempered glass is broken and the wounded are destroyed. According to the report, the curtain wall industry also believes that it is normal for the curtain wall to use semi-tempered glass.
"Unfortunately, after 2003, the country has been across the board and asked the curtain wall to use so-called safer tempered glass. As a result, self-destruction injuries have occurred frequently.
Zhao Xi'an, a researcher at the China Academy of Building Research and a famous curtain wall glass expert in China, said that like Shanghai World Financial Center (495 meters high and 101 floors), which was completed in October 2008, the world's tallest independent TV tower - Guangzhou TV Tower ( The full height is 620 meters, and the glass curtain wall is 460 meters high. Because the height is too high, if the glass self-explosion is to be replaced, it is difficult to lift and the installation is very dangerous. Therefore, avoiding glass self-explosion is the primary consideration, so a semi-tempered glass curtain wall is used.
"We do not intend to negate tempered glass. In some places, tempered glass must be used. For example, point-supported glass panels must use tempered glass and its products due to strength requirements. The problem of self-explosion can only be relegated to the second place. China is too large, curtain wall engineering Too many, the situation is ever-changing, can not be simply a word, one-size-fits-all: 'The curtain wall must be made of tempered glass'. Some curtain wall components, such as glass beams and glass ribs of the support panel, using a single piece of tempered glass called safety glass is extremely dangerous. However, the ordinary float glass of 'non-safety glass' is still less dangerous. Practice has shown that it is unscientific to affirm the tempered glass as a whole, negating semi-tempered glass. Practice is the standard for testing truth, and technology should be allowed. According to the specific conditions of the project, the personnel should use the glass reasonably to obtain a greater degree of safety."
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