1. To check for glossiness, note that the PA66GF25 thermal break strips used in断桥铝 (broken bridge aluminum) windows have a matte texture with a slightly darker color. In contrast, the PVC thermal break strips appear perfectly smooth and glossy, with a noticeably whiter hue. When placed side by side, the difference between the two is clearly visible.
When purchasing断桥铝合金 doors and windows, in addition to paying attention to the wall thickness of the profiles, glass, hardware accessories, and craftsmanship, it’s crucial to carefully distinguish the material of the thermal break strip. After all, even if the other components are top-notch, using a low-quality thermal break will significantly shorten the product’s lifespan. It’s like buying a luxury car worth 1 million yuan—packed with every possible feature—but then equipping it with a tractor engine. In that case, would your fancy car still make any sense?
The functional requirements of thermal break strips dictate that they must simultaneously exhibit both high strength and low thermal conductivity. Otherwise, either significant quality risks may arise in insulated aluminum doors and windows or curtain walls—such as insufficient strength leading to fractures at the connection points of the thermal break—or the insulation purpose could be entirely compromised, since high thermal conductivity would undermine the effectiveness of heat retention. Therefore, the selection of materials and the manufacturing process for thermal break strips are critically important.
2: Types of Insulation Strips
Currently, there are two main types of thermal break strips used in aluminum doors and windows on the market: one is the PA66GF25 thermal strip, and the other is a PVC-based thermal strip.
1. PA66GF25 Thermal Break Strip: PA66 is a series of modified engineering plastic alloys known for their high melting point, excellent heat resistance, and self-extinguishing properties. However, unmodified PA66 material doesn’t match aluminum alloy in terms of tensile strength and linear expansion coefficient. Through experimentation, adding 25% glass fiber to PA66 successfully transforms it into an engineered plastic—ideal as the core material for thermal break strips. Currently, no more rational or cost-effective new material for thermal breaks has been discovered on the international market.
2. PVC Insulation Strip: The main raw material is PVC resin powder mixed with 25% calcium carbonate.
The difference between the two:
1: Tensile Strength
PA66GF25 Insulation Strip > 126 N/mm
PVC insulating strip, approximately 70 N/mm
2: Heat Deflection Temperature:
PA66GF25 Insulation Strip, 240°C
PVC Insulation Strip, 90 Degrees
3: Age Resistance:
PA66GF25 thermal break strip—durable and resistant to aging.
PVC insulating strips are prone to aging.
4: Coefficient of expansion:
PA66GF25 insulating strip has a thermal expansion coefficient consistent with aluminum alloy.
PVC insulating strips have a vastly different coefficient of thermal expansion compared to aluminum alloys.
Three: How to Identify
1. To check for glossiness, observe that the PA66GF25 thermal break strips used in断桥铝 (broken bridge aluminum) windows have a matte texture with a slightly darkened color. In contrast, the PVC thermal break strips appear perfectly smooth and glossy, with a noticeably whiter hue. When placed side by side, the difference between the two is clearly visible.
2. Another important point is that the PA66GF25 thermal break is non-combustible, whereas the PVC thermal break will catch fire after being lit for a short time, producing small flames—and typically emitting a distinct plastic odor.
3. The PA66GF25 thermal break snaps after being bent just once or twice, whereas the PVC thermal break requires more than ten bends before it breaks.
4. When broken, the PA66GF25 thermal break produces a crisp sound and leaves a clean, undistorted fracture surface that can be easily rejoined. In contrast, the PVC thermal break results in a white, deformed fracture when broken.
Four: Summary
When purchasing断桥铝合金 doors and windows, in addition to paying attention to the wall thickness of the profiles, glass, hardware accessories, and craftsmanship, it’s crucial to carefully distinguish the material of the thermal break strip. After all, even if the other components are top-notch, using a low-quality thermal break will significantly shorten the product’s lifespan. It’s like buying a luxury car worth 1 million yuan—packed with every possible feature—but then equipping it with a tractor engine. In that case, would your fancy car still make any sense? |
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