To determine the quality of steel, there are two main points:
1, the quality of the cavity material. To inspect the cavity, it can only be seen before the component is installed or after the destructive disassembly. The quality of the good plastic cavity wall is better, and the size meets the technical specifications. The poor steel walls are thin and do not match the specifications you require. It is recommended that when purchasing, it is best to use high-quality plastic steel. These large brands of plastic steel are easy to find their manufacturer's specification data. It is easy to have a quantitative standard when testing. In general, good plastic materials, most of the color evenly, while the poor majority of cast steel is cast, such as white with yellow. Poor plastic steel is susceptible to yellowing, aging, deformation, and embrittlement.
2. The quality of the steel lining in the cavity. Good steel, steel lining inside the cavity, it plays a great role in strengthening the physical and mechanical properties of plastic steel, especially in the areas of multiple typhoons in the south, it is an essential thing. The good plastic steel liner is regular in size and conforms to the size of the cavity gap. The fake plastic steel either has a gap of one or two levels between the steel liner and the cavity, or it does not have a steel liner. It's easy to check if the steel lining is present. Just use a magnet to suck it, but it's hard to get a bad steel lining at home, and you can't shake it with a big fan of steel windows. See whether the steel lining fits. According to the national regulations, the thickness of the steel lining must reach 1.2mm before it can be used in doors and windows, and must be treated with rust prevention.
Plastic steel doors and windows performance and features:
1, thermal insulation energy:
Multi-cavity plastic profile structure, with good thermal insulation properties, heat transfer coefficient is very small, only 1/357 of steel, aluminum 1/1250, the relevant department investigation found that: the use of steel doors and windows than the use of wooden windows in the room, In winter, the indoor temperature increases by 4-5°C. In addition, the extensive use of steel doors and windows also saves the country a large amount of wood, aluminum and steel materials. The energy consumption of PVC profiles of the same weight is 1/14.5 of that of steel, and 1 of aluminum. /8.8, its economic and social benefits are huge.
2, air tightness:
At 10Pa, the long penetration per unit slot is less than 0.5m3/mh, which is in line with GB7107 “Classification and Detection Method of Air Permeability of Building Exterior Windowsâ€.
3, watertightness:
The maximum pressure that has not been infiltrated is 350Pa, which conforms to the second grade of GB7108 (graduation and detection method of exterior window rainwater leakage performance).
4, wind pressure resistance:
When the relative stress of the main bearing member is 1/300, the wind pressure resistance value is 1.4KPa, and the safety inspection result is 3500Pa, which conforms to the first level of GB7106 Wind Pressure Performance Classification and Detection Method for Exterior Window of Buildings.
5, sound insulation:
RW=33dB. Accord with the third-level requirements of GB8485 air-borne sound insulation performance grading and detection method of building exterior windows.
6, corrosion resistance:
Plastic profiles have a unique formula with good corrosion resistance. The corrosion resistance of plastic J window is mainly determined by the choice of hardware, such as the selection of anti-corrosion hardware and stainless steel material, and its service life is about twice that of steel window.
7, weather resistance:
Plastic profile uses a unique formula to improve its cold resistance, plastic steel doors and windows can be long-term use in a large temperature difference in the environment (70 °C ~ -70 °C), exposure to the sun, the humidity will not make it degenerate. Aging embrittlement and other phenomena. The earliest steel doors and windows have been used for 30 years, and their materials are as good as ever. Based on this calculation, the service life of plastic steel doors and windows under normal conditions can reach more than 50 years.
8. Fire performance:
Plastic steel doors and windows are not flammable, do not support combustion, can self-extinguish, and are safe and reliable. The oxygen index detected by the Shanghai Research Institute of the Ministry of Science and Technology is 47, which conforms to GB/T8814-1998 "PVC, Profiles for Door and Window Frame". The required oxygen index is not lower than the 38 requirement.
9, insulation performance:
The plastic profiles used for plastic doors and windows are a good insulating material with high non-conductive safety factor.
10, the finished product has high dimensional accuracy and no deformation:
The plastic material is smooth and smooth, and the quality is consistent with the inside and outside. No special surface treatment is required. It is easy to process and easy to cut. After the welding process, the length, width and diagonal line tolerances of the finished product can be controlled within Zrnm, and the machining accuracy is high. The welding angle strength can reach more than 3500N. At the same time, the solder fillet is removed through the clear corner and the outer surface of the profile welding is flat.
11, easy protection:
Plastic steel doors and windows are not eroded, and almost no maintenance is required. When dirty, clean water can be used to rinse and clean white.
12, anti-theft performance:
Plastic glass doors and windows of the glass bead, all toward the interior, the glass is damaged and replaced, the profile of the surface of high hardness, easy to destroy, have a good anti-theft.
13, the price is moderate:
Compared with aluminum windows, wooden windows and steel windows with the same performance, the price of steel doors and windows is more economical and practical.
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