Weatherseals
From Quanex Brand
AmesburyTruth®
What are Weatherseals and Why Do They Matter?
Weatherseals are essential components used to close the small gaps between moving and fixed parts in a wide range of systems and applications. While they are mostly associated with window weatherseals and door weatherseals, these solutions are used anywhere a reliable barrier is needed to control air, water, dust, noise, or thermal transfer.
These gaps may seem minor, but without effective sealing, they can lead to energy loss, water infiltration, increased noise, and long-term wear.
High-quality weatherseals play a critical role in improving energy efficiency, maintaining indoor comfort, and protecting products from environmental exposure. They also help ensure systems operate smoothly while continuing to perform over time.
Weatherseals are used across a wide range of industries and applications wherever a controlled seal is required between two surfaces. Beyond windows and doors, common applications can include:
- Garage doors and overhead door systems
- Refrigeration units, cold storage, and HVAC systems
- Industrial equipment and machinery enclosures
- Transportation components, including rail, automotive, and specialty vehicles
- Data centers and electrical enclosures requiring environmental protection
- Appliances and consumer products with moving or sealing components
- Cleanrooms and controlled environments where contamination must be minimized
- Storage systems, cabinets, and access panels
In each of these applications, seals help manage environmental exposure, improve energy efficiency, reduce noise, and support long-term product performance.
From reducing drafts and outside noise to supporting better thermal performance, the right weatherseal can significantly impact how a system performs in real-world conditions.
Quanex offers a comprehensive portfolio of weathersealing solutions designed to meet the performance demands of modern systems across a wide range of industries and applications. By combining advanced materials with precision manufacturing, our seals are engineered to perform reliably across a wide range of applications and environments.
Our core weatherseal technologies include:
- Urethane (polyurethane foam) seals
- Polypropylene yarn (brush pile) seals
- TPE (thermoplastic elastomer) foam seals
Each type is designed to solve different performance challenges, allowing manufacturers and specifiers to select the best solution based on system design, environmental exposure, and performance requirements.
Quanex weatherseals are designed to perform not only in traditional window and door systems, but also in a variety of other applications where sealing performance is critical. From building products to specialty industrial systems, our solutions help control environmental conditions, improve durability, and support long-term reliability.
Urethane weatherseals are known for their long-term durability and consistent sealing performance. Designed with a foam core and protective outer layer, they maintain their shape and effectiveness even after repeated compression over time.
These seals are especially well-suited for applications where long lifespan and ease of operation are critical. Their low operating force allows windows and doors to open and close smoothly, while still maintaining a reliable seal against the elements.
Because of their strong compression recovery, urethane seals continue to perform in high-use areas where maintaining a tight seal over time is essential. This helps reduce drafts, improve comfort, and extend the life of the overall system.
These characteristics also make urethane seals a strong option for other high-cycle applications such as garage doors and specialty enclosures, where long-term durability and consistent performance are essential.
Polypropylene yarn seals, commonly referred to as brush pile, offer a versatile and widely used sealing solution for window and door systems.
Made from durable, recyclable polypropylene fibers, these seals create a flexible barrier that helps reduce air and water infiltration while adapting to uneven surfaces. Their low-friction design makes them ideal for sliding applications, where smooth and consistent operation is a priority.
Because they are available in a wide range of sizes, densities, and configurations, brush pile seals are often the first choice for many standard applications. They provide a reliable balance of performance, flexibility, and cost-effectiveness across a variety of system designs.
In addition to fenestration systems, these seals are commonly used in applications like sliding industrial components, storage systems, and light-duty sealing environments where flexibility and low friction are important.
TPE (thermoplastic elastomer) foam seals combine the flexibility of rubber with the processing advantages of thermoplastics, resulting in a highly adaptable and high-performing sealing solution.
With a nearly closed-cell structure, TPE foam seals are especially effective in preventing water penetration and maintaining performance in high-pressure environments. This makes them a strong choice for applications where resistance to water and air infiltration is critical.
Their design flexibility allows them to be engineered for a wide range of system requirements, making them suitable for both standard and highly customized applications. In addition, TPE materials are recyclable, supporting more sustainable product design.
Their water-resistant properties and design flexibility also make them well-suited for refrigeration systems, high-moisture environments, and other applications where sealing against water and pressure is critical.
Quanex weatherseals are engineered and tested to meet the performance expectations of modern systems across multiple industries. Our products are tested against recognized standards such as AAMA 701/702, which define performance requirements for weathersealing components used in windows and doors.
Quanex weatherseals achieve an AAMA “A” rating, representing the highest level of performance within these standards. Testing is conducted regularly on product families, and our in-house lab capabilities allow for continuous validation and quality control.
In addition to performance testing, select Quanex weatherseal solutions are also evaluated for use in fire-rated applications. Certain gasketing materials are UL-certified for use in fire doors and frames, helping ensure they do not negatively impact fire resistance ratings when properly installed.
Some Quanex products are classified for use in fire door assemblies with ratings of up to 3 hours, depending on the specific application and configuration.
This combination of performance testing and safety validation helps ensure that Quanex weatherseals deliver reliable protection against air, water, and environmental exposure, while also supporting compliance in critical applications.
Whether your application requires high-performance foam seals, flexible brush solutions, or custom extruded designs, our teams offer a wide range of options to support your needs.
Explore Urethane Foam Seal Solutions >
Explore Polypropylene Yarn Seal Solutions >
Explore TPE Foam Seal Solutions >
Choosing the right weatherseal can have a significant impact on performance, durability, and user experience. Our team works closely with manufacturers, OEMs, and specifiers to identify the best solution for each application.
Weatherseals are critical components of modern window and door systems, as well as various other applications and they help improve energy efficiency, comfort, and long-term product performance. Below are answers to some common questions about weatherseals and how they are used across a wide range of applications where controlling air, water, dust, noise, and thermal transfer is critical.
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Q: Can weatherseals be used in applications other than windows and doors?
A: Yes. While window weatherseals and door weatherseals are the common applications, weatherseals are also used in a wide range of other products and industries. These include garage doors, refrigeration systems, industrial enclosures, and other applications where controlling air, water, dust, or noise is important.
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Q: Why are weatherseals important in window and door performance?
A: Weatherseals are important because they help control air infiltration, water penetration, energy loss, noise transfer, and long-term durability in window and door systems. Even high-performance frames and glazing rely on effective sealing components to maintain overall system performance.
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Q: How long do weatherseals typically last?
A: The lifespan of a weatherseal depends on factors such as material type, environmental exposure, frequency of use, and the demands of the specific application. High-quality weatherseals can maintain effective performance for many years when properly specified and installed. In high-cycle or harsh environments, such as industrial equipment, transportation systems, or exterior building applications, selecting the right material and design is critical to ensuring long-term durability and consistent sealing performance.
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Q: Do Quanex weatherseals meet fire or safety standards?
A: Some Quanex weatherseal products are tested and certified for use in fire-rated applications. Select gasketing materials are UL-certified for installation in fire doors and frames, ensuring they do not compromise the fire resistance of the assembly when properly installed. These solutions can support compliance in safety-critical environments.
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Q: What is the difference between foam, brush pile, and extruded weatherseals?
A: Polyurethane foam seals provide excellent thermal insulation and compression recovery. Brush pile seals are ideal for sliding systems that require low-friction movement. Extruded seals offer highly customizable profiles, materials, and geometries for specialized applications. Each technology serves different performance and design needs.
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Q: What type of weatherseal provides the best thermal insulation?
A: Polyurethane foam weatherseals and TPE seals are widely recognized for their excellent thermal performance. The polyurethane foam structure provides very low thermal conductivity, helping minimize heat transfer and improve the overall energy efficiency of window and door systems, and TPE seals have been tested to high standards with the NFRC and provide a well rounded thermal insulation while suppling all the standard properties of a weather seal.
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Q: How do manufacturers choose the right weatherseal?
A: Selecting the right weatherseal depends on several factors, including window or door design, operating style, environmental conditions, and performance requirements. Manufacturers often evaluate factors such as compression performance, durability, thermal properties, and installation method when choosing the most appropriate sealing solution.