Many people focus on appearance when buying windows, thinking that a high-quality look and clean lines are sufficient. However, those in the industry understand that the true "soul" of system windows is never their appearance, but their sealing system.
The sealing system is key to ensuring windows are "airtight, waterproof, and creak-free." If your windows let in drafts in winter, leak water during rain, or creak when closed… don't doubt it, 99% of the time it's due to poor sealing.
What are the intricacies of External Casement Aluminum Window sealing systems? Why do some windows become looser with use, while good External Casement Aluminum Windows become more stable?
What is the "sealing system" of a system window?
Simply put, an External Casement Aluminum Window sealing system is not a single component, but a complete combination of structure, materials, and processes, including:
Sealing strips (rubber strips)
Frame structure design
Hardware locking point layout
Corner and molding processes
These must work together to achieve true airtightness, watertightness, sound insulation, and wind pressure resistance.
Sealing Strips
There are many types of sealing strips on the market: PVC, EPDM, TPE, EPDM, foam strips… Each one sounds quite professional, but when actually choosing, grasping three core points is enough. First, look at the elasticity. You can tell how good the strip is and how long it ages just by squeezing it. Strips with poor elasticity will collapse after six months, allowing wind to blow directly in through the gaps; while Etaifeng insists on using highly elastic TPE or EPDM sealing strips, which rebound quickly, are UV resistant, and low-temperature resistant, and won't freeze solid even in temperatures of -20 or -30 degrees Celsius. Second, look at the odor, that is, its environmental friendliness. Cheap strips have a particularly strong smell, which becomes more noticeable in the summer sun, and you can smell it as soon as you open the windows; Etaifeng's External Casement Aluminum Window strips have a high environmental protection rating and do not have a pungent odor, making them suitable for residences, schools, hospitals, and other scenarios with high air quality requirements. Third, look at the durability. Good sealing strips can be used stably for at least ten years without deformation or cracking. Etaifeng conducts fatigue tests during the production of its sealing strips to ensure long-term reliability. In short, a good sealing strip accounts for 80% of a window's stability – preventing drafts, water ingress, and rattling. This is why External Casement Aluminum Window sealing strips must be carefully selected.
Frame Structure
Even the best sealing strip is useless if it doesn't adhere properly or tighten. Therefore, the structure of the Exterior aluminum hinged window frame itself is equally crucial. Ordinary windows often have only one or two seals, relying on luck during wind and rain. External Casement Aluminum Window typically has three: an outer seal for wind and rain protection, a middle seal for sound and wind insulation, and an inner seal for further airflow control. Etaifeng's Exterior aluminum hinged window frames feature a highly optimized cavity structure, ensuring each seal fits tightly and resists deformation even in strong winds. External Casement Aluminum Window's multi-cavity structure acts like a human skeleton, with internal reinforcement making the window frame more stable, preventing swaying or deformation under high wind pressure, allowing the sealing strips to continue functioning effectively.
Hardware System
The hardware actually determines whether a window can truly "close tightly." Ordinary windows have few locking points, often relying on one or two points to hold the entire window in place, which naturally becomes loose over time. Etaifeng's Exterior aluminum hinged window system uses a multi-point locking design; with a push and pull, the entire window locks simultaneously, ensuring very even pressure on the sealing strip and preventing any gaps or drafts. Furthermore, the smoothness of the hardware is crucial. If it's clunky or sticky, it not only affects the user experience but can also cause the sealing strip to not be pressed tightly enough, leading to premature aging due to uneven pressure over time.
Corner Sealing and Glazing Strip Technology
Many windows that leak air and water may not have a problem with the entire window, but rather a problem with the corners. Etaifeng's Exterior aluminum hinged windows feature enhanced corner structures: an injection molding process for higher corner strength and prevents loosening; corner brackets further reinforce the frame, making it more stable and preventing deformation; the sealing strips are also seamlessly connected, leaving no gaps or breaks, eliminating any entry points for wind and rain. As for the glazing strips, we use automated equipment to press them in place in one go, preventing loosening, warping, or misalignment. The entire window is sealed tightly, truly keeping out wind and rain.
Why is Etaifeng's sealing system more reliable?
Etaifeng's Exterior aluminum hinged windows generally have more stable sealing performance than ordinary windows because they are the result of systematic design + factory production + full-process testing. All Exterior aluminum hinged window sealing strips are uniformly matched according to the system plan, with precise calculations of hardness, size, and contact surface. The profile structure is also specifically optimized for sealing performance, ensuring the sealing strip is pressed tightly and adheres firmly every time. The hardware system is integrated with the sealing design, with strict matching from opening angle to clamping force. Etaifeng's factory has professional testing equipment for airtightness, watertightness, and wind pressure resistance, allowing every window to be tested according to standards.
If you are working on a project, undertaking an engineering project, or looking for a reliable window system that will not experience long-term problems, the sealing system is a crucial factor to consider.
Feel free to contact Etaifeng anytime!
We support engineering projects, OEM, and customized system window solutions.
You are also welcome to visit our factory to see our production line.
You can discuss technical details face-to-face with our team.
You can also bring your own solutions, and we'll work together to make your project the best it can be.
