Aluminum and its various alloys have long been recognized for their superior properties that other materials struggle to match. They are lightweight, strong, and can be extruded into complex cross-sectional shapes suitable for a wide range of applications. Experts predict that although aluminum alloy doors and windows have faced challenges due to the influx of low-quality products in recent years, they will continue to dominate the market in the future. Driven by growth in the real estate sector, the advantages of aluminum alloy—such as excellent corrosion resistance, minimal deformation, high fire resistance, long service life, and environmental friendliness—ensure their continued relevance.
Aluminum alloy doors and windows were introduced in China during the early 1980s. Their unique benefits, such as light weight and resistance to corrosion, helped them gradually replace traditional steel windows and gain popularity among consumers. However, in recent years, domestic plastic-steel windows have experienced rapid development, significantly impacting the aluminum window market. Some people argue that aluminum frames conduct heat too easily, making them less energy-efficient compared to plastic alternatives. In response, experts from the Aluminum Products Committee of the China Building Decoration Association clarify that thermal insulation is primarily determined by the glass used, not the frame material itself.
Plastic-steel windows have traditionally been used in low-rise buildings because of issues like aging, cracking, and structural weaknesses caused by gaps between the plastic and steel components. These gaps allow air and water to enter, leading to corrosion and reduced strength over time. As a result, many plastic windows become warped or difficult to operate. In contrast, aluminum alloys have been widely appreciated globally for their versatility, allowing the creation of multi-functional, complex-shaped windows with a service life exceeding 50 years. This durability makes it hard for other materials, including plastic-steel windows, to compete.
Under the pressure from both plastic-steel competition and the potential entry of foreign aluminum manufacturers, many companies believe that the decline in aluminum alloy demand stems from consumer concerns about thinner, lower-quality aluminum profiles. If low-quality, low-cost products continue to dominate the market, they may eventually be weeded out. To survive, companies must focus on innovation, invest in high technology, and develop their own brands. For example, insulated aluminum alloy profiles can help reduce heat transfer, offering thermal performance comparable to plastic-steel windows. Industry insiders note that the rise of plastic-steel windows has pushed domestic manufacturers to improve quality and innovate. The opportunity of joining the WTO has also brought new pressures and challenges.
As a new building material, plastic-steel windows have rapidly gained market share in the past two years, surpassing traditional wood, steel, and color-coated metal windows. Some believe that the next century will belong to plastic-steel windows, pushing aluminum alloy doors and windows toward obsolescence. But what are the real advantages and disadvantages of each? Let's compare them based on key performance characteristics.
1. **Sound Insulation**
Plastic-steel windows offer significantly better sound insulation than aluminum alloy ones. For instance, in buildings meeting similar noise standards, an aluminum window installation needs to be at least 50 meters away from a main road, while a plastic-steel window can be placed within 16 meters.
2. **Thermal Insulation**
Thermal conductivity is a key factor. PVC has a thermal conductivity of 0.14, while aluminum is 175. That means aluminum conducts heat 1,250 times more efficiently than PVC. While this doesn’t automatically mean aluminum is worse for energy efficiency, studies show that rooms with plastic-steel windows can stay up to 5 degrees cooler per day than those with aluminum windows, even when using air conditioning.
3. **Corrosion Resistance**
Plastic-steel windows are highly resistant to acid, alkali, and environmental pollutants, making them ideal for urban areas prone to acid rain. Aluminum, however, is more susceptible to oxidation and corrosion, which can shorten its lifespan.
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