When manufacturing high-quality aluminum windows and doors, every component matters. The Aluminum Window Spacer Bar is the structural backbone of the insulated glass unit (IGU). It keeps the glass panes at the perfect distance, holds the desiccant, and ensures the long-term sealing of the window.
If you are sourcing spacer bars for your window factory, choosing the wrong one can lead to failed seals, foggy glass, and costly customer complaints. Here is our expert guide on how to choose the right spacer bar.
1. Understand the Two Types: Bendable vs. Non-bendable
Window designs are becoming increasingly complex, with more curved and angled frames. Therefore, the spacer bar must be highly adaptable.
Bendable Spacer Bars: Essential for continuous corner processing. They must be bent seamlessly without cracking the aluminum.
Non-bendable (Straight) Spacer Bars: Used for standard rectangular windows, typically connected with corner keys.
2. The Critical Role of Wall Thickness
This is where many window manufacturers encounter problems. The wall thickness of the aluminum spacer bar directly affects its bending performance and structural strength.
If you use fully automatic bending machines, you must choose a wall thickness of 0.33mm or above to prevent micro-cracks and ensure a tight seal.
If you use semi-automatic machines, 12mm Aluminum Spacer Bar a wall thickness of 0.25mm to 0.30mm offers a perfect balance of performance and cost-effectiveness.
3. Pairing with High-Performance Sealants
The spacer bar doesn’t work alone. To guarantee a perfectly sealed aluminum window, the spacer bar must be paired with premium sealing materials.
Butyl Tape: Provides the first line of defense against moisture. Our butyl tape for insulated glass offers excellent initial adhesion to the aluminum surface.
Two-Part Silicone Sealant: Provides the structural strength for the second seal. A fast-curing two-part silicone sealant will significantly speed up your production line.
4. Don’t Forget the Molecular Sieve
The inside of the spacer bar is filled with molecular sieve desiccant. It absorbs any residual moisture inside the window. If the desiccant is saturated or of low quality, your window will eventually fog up. Always ensure your supplier provides high-adsorption desiccant.
Conclusion: Get the Complete Window Glazing Solution
Choosing the right aluminum window spacer bar is about more than just buying a piece of metal. It’s about ensuring your entire window assembly is durable, efficient, and visually appealing.
At Henghui, we provide a complete range of insulating glass accessories, including spacer bars, butyl tape, molecular sieves, and sealants. Stop dealing with multiple suppliers and let us be your one-stop solution.
