Which is better: PVC-coated steel windows or thermal-break aluminum system windows?

1. The Difference Between Thermal Break Aluminum Windows and PVC-Coated Steel Windows

Thermal break aluminum windows and PVC-coated steel windows are two of the most common types of windows on the market. Both materials have their own advantages. In terms of price, thermal break aluminum windows and PVC-coated steel windows are comparable, but in terms of appearance, thermal break aluminum windows look more stylish and also offer excellent thermal insulation.

Thermal-break aluminum windows are a new type of product featuring a thermal break design that blocks outdoor heat, delivering excellent results in energy efficiency, thermal insulation, and soundproofing. They also offer strong wind resistance.

PVC-steel windows are door and window products made primarily from plastic profiles. Following wooden, iron, and aluminum alloy windows, this type was actively promoted by the government in the mid-1990s. PVC-steel windows are affordable and offer relatively good performance. They are widely used window types in home decoration today.

Differences Between Thermal Break Aluminum System Doors and Windows and PVC-Steel Windows:

Difference 1: Strength; PVC-steel doors and windows are less strong than thermal break aluminum doors and windows.
Difference 2: Properties; thermal break aluminum windows have higher tensile and shear strength and greater resistance to thermal deformation, making them sturdy and durable. PVC-steel is welded at high temperatures, causing welds to easily detach, and the material itself is susceptible to acid and alkali corrosion. ​Difference 3: Functional Differences; thermal break aluminum alloy doors and windows offer superior waterproofing performance compared to rigid plastic doors and windows. Thermal break aluminum system doors and windows are manufactured through assembly and corner sealing processes, so the windows themselves do not have water leakage issues. The frames of PVC doors and windows are welded, making them non-waterproof.

2. Comparison of the Advantages and Disadvantages of Thermal Break Aluminum System Windows and PVC-U Windows
Thermal break aluminum system windows are made of aluminum alloy that has undergone thermal break treatment and are manufactured using advanced corner assembly technology. These high-end, energy-efficient, and environmentally friendly windows offer a certain level of thermal insulation; they feature strong design flexibility, a rich and varied color palette, and are resistant to fading. Additionally, thermal break aluminum windows are non-flammable and self-extinguishing when removed from a flame, making them safe and reliable. They fully comply with fire safety requirements.

(PVC-Coated Steel Windows)

PVC-coated steel windows are made from plastic profiles (PVC, PE). The advantages of plastic windows are obvious: their surface material is PVC, commonly known as plastic. Since it is plastic, its ability to block cold and heat is inherently superior to that of metal materials, and there is virtually no heat or cold conduction through the frame.
Why are low-priced PVC-coated steel windows now facing elimination from the market? Let’s discuss their drawbacks.
First, 99% of all low-cost PVC-steel windows currently on the market are manufactured using a hot-melt process. This involves heating two plastic pieces until they melt and bonding them together. Since this is a hot-melt process, the steel reinforcement inside cannot be melted, resulting in the absence of steel reinforcement at the corners. This, in turn, leads to problems such as sagging and warping.
Second, the surface is made of plastic. Anyone who has used PVC-steel windows knows that the surface oxidizes, turning black or yellow—stains that cannot be removed no matter how much you scrub, which significantly affects their appearance.

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