The national standard of floor spring door is that the first-class product is opened ≥ 300000 times (actually the minimum standard of qualified products), the high-quality product is opened ≥ 500000 times, and the European standard is the minimum 500000 times.
Before installation, the construction shall be carried out according to the plan, and the varieties, standards, opening direction and support pieces of doors and windows shall be checked.
It has the advantages of light weight, high strength, corrosion resistance, small deformation, strong fire resistance and long service life (more than 50 years)
This door is treated by various processes, and its surface is resistant to acid and alkali erosion and is not affected by air pollution, acid rain and ozone. UV resistant, long-term maintenance of inherent color and luster.
In recent years, both aluminum alloy doors and windows and broken bridge aluminum alloy doors and windows are very popular with the market and consumers because of their long service life and beautiful appearance.
