Which material is actually better for the thermal break strip in broken bridge aluminum alloy doors and windows?
Release date:
2025-09-01
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 manufacturing processes, it’s crucial to identify the material of the thermal break strip. After all, even if your other components are top-notch, using a low-quality thermal break strip will significantly reduce the product’s lifespan.
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 made from PVC material.
1. PA66GF25 Insulation 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 has proven to be the optimal solution, making it the fundamental material for insulation strips. Currently, no more rational or cost-effective new material for insulation strips has been discovered internationally.
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
90-degree PVC Insulation Strip
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 manufacturing processes, it’s crucial to distinguish the material of the thermal break strip. After all, even if your other components are top-notch, using a low-quality thermal break strip will significantly shorten the product’s lifespan.
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