The most distinctive feature of Sydney, Australia, is architecture, and the most distinctive architecture is Sydney Opera House. As the soul of Australia, Sydney Opera House is recognized as one of the seven wonders of the world in the twentieth Century. It has music hall, opera house, theater, children's Theatre and photography field. Every month or even every week, it has auctions, concerts and other activities. It receives about 200000 people every year.

The Sydney Opera House is a sculptural body built on a harbor, like a white petal floating in the air. Apart from its exquisite appearance, its most wonderful part is that no matter where you sit in the courtyard, you can enjoy the outside scenery without obstructing and clearly, such as sailing boats on the sea and flying white gulls. The more than 60 - meter - high wall of the opera house is almost made of transparent glass blocks. Because of this, the world record is created.

According to statistics, Sydney Opera House has a share of 6625 square meters of glass, with more than 250 thousand high - hardness glass blocks. The glass is distributed inside and outside the opera house. The interior architecture imitated the Maya culture and the Aztec Temple, using the imported glass inlay, with the unique material of Australia, which is noble and practical. The external surface of the glass building is a French manufacturer of special double glass - plain and topaz, a total of 700 sizes, 2000 tablets.

The glass is very hard, and even if you drop a tile from the highest place in the opera house and hit the lowest glass, the tourists next to it will not be injured. So, why is it so hard for the broken glass can't hurt people?

Because the glass used in Sydney Opera House is laminated glass. Laminated glass is a composite glass product sandwiched between two or more pieces of glass sandwiched between organic polymer interlayer, after special high temperature preloading (or vacuum pumping) and high temperature and high pressure process, so that glass and intermediate film permanently adhere together. As a safety glass, the biggest advantage of laminated glass is that after the impact and crush of glass, due to the bonding effect of PVB film sandwiched between two ordinary glass, it will not hurt people after breaking the ordinary glass.

In addition, laminated glass has excellent seismic intrusion ability, which can resist the attack of continuous film hammer, chopping knives and other weapons, but also in quite a long time to resist bullet penetration. In Europe and America, most of the building glass is made of laminated glass.

It is said that Sydney Opera House's choice of laminated glass is the masterpiece of Jon Uzon, the chief designer. In 1963, when the Sydney Opera House was built, the glass manufacturing technology used for building was far from now developed, and laminated glass was the most suitable choice at that time.

More than 10 years later, toughened glass technology has been widely promoted and popularized all over the world. Tempered glass has been used in automobile, building, aviation, electronics and other fields, especially in building and automotive development. Tempered glass has two advantages. First, the strength is several times higher than that of ordinary glass, and the bending capacity is increased. The two is the carrying capacity. Even though the toughened glass is damaged, it also presents a small fragment without acute angle, which greatly reduces the harm to human body. Toughened glass sandwich glass is much cheaper than the price when there is: hypothesis of toughened glass, laminated glass will not choose uesson estimation.