First, the strength
High-grade plastic steel doors and windows and aluminum alloy doors and windows are almost the same in the wind pressure.
Second, durability
Foreign research shows that high-grade steel doors and windows have been used in Europe for more than 30 years. Aluminum alloy doors and windows on the durability of the aluminum alloy itself is good, but because the dowels, rail material is non-aluminum metal, the practice shows that electrolytic corrosion will occur, many old aluminum alloy doors and windows are not flexible to push and pull is caused by this reason.
Third, the sealing
Due to the high precision of high-grade plastic doors and windows, the splicing at the frame fan is designed to be seamless and the corners are welded seamlessly. High-grade plastic steel doors and windows have an independent scientific drainage system equipped with a windshield to prevent rainwater from pouring back. As the aluminum alloy doors and windows are widely used to interpenetrate the rubber strips, the seal performance is degraded due to the occurrence of gaps at the corners of the fan due to shrinkage of the rubber strips.
Fourth, water permeability
High-grade plastic doors and windows have better waterproof performance than aluminum alloy doors and windows. The frame of the plastic door and window is welded, and there is no problem of seepage of the window itself. Installation uses a variety of waterproof materials, such as: polyurethane foam sealant, embedded in the outdoor side of the hollow slot sealant, the inner side of the neutral silicone sealant. The aluminum alloy door and window joints are installed using a single cement mortar, the frame is no other waterproof technology, the window itself is riveted frame, there are gaps, easy to seepage. The drain hole of the aluminum alloy is in direct contact with the room and cannot prevent rainwater from pouring back.
Fifth, the surface color
Aluminum alloy surface treatment: anodizing, coloring; electrophoretic painting; powder coating; fluorocarbon paint spraying.
Plastic profiles can also be colorful. In addition to spraying technology (fluorocarbon coating and DuPont coating), ASA and PMMA are co-extruded, and can also be applied to imitation wood grain films. New surface treatment technologies such as wooden windows are widely used in the processing of plastic steel profiles.
Six, thermal insulation
The thermal conductivity of plastic profiles is 1/1250 for aluminum alloys and 1/357 for steels. The same two rooms, rooms with plastic steel doors and windows, are about 5°C higher than aluminum alloys in winter and about 5°C lower in summer. The energy-saving effect is very obvious.
Seventh, sound insulation
As the majority of plastic steel door and window profiles are three-chamber design, there are even four-chamber and five-chamber bodies, and the acoustic performance of plastic doors and windows is more than 35 decibels, which is far from being comparable to aluminum alloys with single cavity structure.
Eight, lightning protection
Plastic profiles are insulators, and the steel lining inside the cavity does not form a loop, so no lightning protection grounding measures are required. Aluminum alloys are good conductors. There must be lightning protection grounding measures on high-rise buildings to increase costs.
Nine, economic aspects
High-grade plastic steel doors and windows one-time investment, but the follow-up energy saving, sequelae less; aluminum alloy doors and windows a lower price, but the follow-up electricity, water and other sequelae problems. Therefore, economics in the long run is still good for steel doors and windows.
X. National Policy
Aluminum alloy is a high-energy-consuming industry. The state has been discouraging development. While PVC has many sources, including calcium carbide production, calcium carbide mines have relatively rich resources in China. The use of plastic instead of metal is the development direction of the society, as well as our common people. It is necessary to solve difficulties for the country and respond positively to the country's call to use high-quality plastic steel doors and windows with good results. The aluminum alloy is saved in a place more suitable for its use, such as spacecraft, vehicles, etc.
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