1, a look at profiles: profile quality is good or bad, directly determine the advantages and disadvantages of doors and windows. (1) plastic window with profiles: good PVC profiles should be multi-cavity, wall thickness, the formula containing anti-aging, anti-UV additives, the product of the index value should be consistent with the relevant national standard requirements. From the appearance should be the surface is smooth, the color is white; middle and low profile is white in the yellow, this color sunscreen is poor, the use of a few years later will become more yellow until aging, deformation, brittle fracture, the reason is the profile There are too many calcium in the formula. Should have a separate drainage chamber and steel reinforcement chamber to prevent corrosion of steel lining, and better from the role of noise reduction. (2) broken bridge aluminum alloy profiles: high-quality aluminum alloy doors and windows used in aluminum, thickness, strength and oxide film
Etc., should be consistent with the relevant national standards, wall thickness should be more than 1.4 mm. Insulation bar to break the aluminum plate most critical part of the need to use PA66 nylon, which is the national standard, but the current market, many manufacturers use cheap PVC plastic insulation, which will seriously affect the product life.
2, see accessories: hardware, strips, tops and other accessories are the key to the production of high quality doors and windows, doors and windows with hollow glass, the weight per square meter may be more than 40 kg, so the requirements of various accessories is very high. Different manufacturers of accessories quality difference between the price difference is also several times. Poor use of low-grade accessories will be damaged, resulting in sagging sag, push and pull, switch lax, bad seal, and even leave a security risk.
3, three look at the production: production equipment and process to determine whether the overall performance of doors and windows are excellent. According to the national standard, the difference between the diagonal of windows and doors should be controlled within 2-3 mm, there are strict process parameters and control range, which requires a certain production equipment and technology for the guarantee, a strong quality of the workforce. So the street workshops and regular manufacturers of doors and windows, the quality of a world of difference.
4, four to see the installation: one-third of the production, seven install, if you do not pay attention to the installation of standards, it may cause deformation of doors and windows later. Window frame and the wall must be between the expansion joints, to prevent thermal expansion and contraction or a slight settlement of the doors and windows deformation. At the same time in order to ensure waterproof, heat insulation, sound insulation performance, must be filled with elastic material expansion joints, and then sealed with a sealant. The price of these materials is high, the quality is very different, the installation should be to prevent jerry and shoddy.
5, five to see the service: the use of the window for more than 30 years in the course of the inevitable use of glass damage, damage to the hardware, etc., and users to solve their own more difficult, which requires manufacturers to provide long-term perfect after- Choose regular manufacturers certainly more reliable than mobile workshops.
6, six to see the price: the price to shop around, but must be in the same material and performance on the basis of price, if ignorant of the cheap, the price is not equal to the performance,
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