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Q-LON® Seals
Q-LON® urethane weatherseals combine soft compression, high recovery, and long-term sealing performance for window and door systems. Manufactured from polyurethane foam, Q-LON weatherseals are designed to provide reliable sealing contact while helping reduce operating force compared to many traditional compression seal designs.
Available across multiple mounting configurations, including kerf, T-slot, pocket, surface-mount, and door seal applications, Q-LON profiles provide engineers and manufacturers with flexible options for addressing thermal performance, durability, and long-term weathersealing requirements.
Why Engineers Specify Urethane Weatherseals
Q-LON urethane weatherseals are designed for applications where long-term compression recovery and low operating force are important design considerations. Manufactured from polyurethane foam, Q-LON weatherseals compress easily while helping maintain consistent sealing contact through repeated operating cycles.
Unlike many traditional compression weatherseals, urethane foam weatherseals are often selected because of their recovery characteristics. Over time, some weatherseal materials can take a compression set and may not fully return to their original shape after repeated compression. Urethane foam is commonly specified when maintaining sealing contact over the life of the window or door system is a key design objective.
This combination of recovery, low operating force, and sealing performance makes urethane weatherseals a common choice for window and door manufacturers evaluating long-term thermal performance, durability, and ease of operation.
- High recovery after repeated compression. Urethane foam is often selected for applications where maintaining sealing contact over time is important. Recovery characteristics can influence long-term weatherseal performance in frequently operated windows and doors.
- Low operating force. The soft compression characteristics of urethane foam can help reduce the force required to open and close windows and doors while still maintaining a sealing interface.
- Supports long-term system performance. Weatherseal performance is influenced by how the seal responds after repeated cycling. Engineers often evaluate recovery characteristics alongside dimensional requirements and environmental exposure.
- Available across multiple mounting configurations. Q-LON weatherseals are offered in kerf, T-slot, pocket, surface-mount, and door seal configurations, allowing manufacturers to use urethane technology across multiple product platforms.
- Evaluate recovery, not just compression. Initial sealing performance is only part of the equation. Engineers should also consider how the weatherseal performs after repeated compression cycles.
- Balance sealing force and ease of operation. More compression is not always better. Weatherseal selection should balance sealing objectives with operating force requirements.
- Consider environmental exposure. Temperature variation, Weather exposure, paints, stains, and cleaning products can influence long-term material performance.
- Design for the complete system. Weatherseals should be evaluated as part of the overall window or door assembly rather than as an isolated component.
Weatherseals
Compare available Q-LON profiles by application, reach, mounting type, and mounting dimensions. Reviewing these characteristics together can help engineers identify polyurethane weatherseal solutions that align with the performance requirements of their window and door systems.
| Profile Number | Primary Category | Reach | Mounting Type | Mounting Width | Mounting Depth |
|---|---|---|---|---|---|
| 72611 | door kerf seal | .490" | kerf slot | .125" | .438" |
| QL 3005 | window compression | .258" | kerf slot | .106"-.118" | .236" |
| QL 3074 | window compression | .257" | kerf slot | .106"-.126" | .256" |
| QL 9898 | window compression | .262" | kerf slot | .126" | .193" |
| 70014 - left facing | window compression | .360" | .190" | - | |
| 70015 - right facing | window compression | .355" | .190" | - | |
| QL 3078 | window compression | .354" | kerf slot | .118"-.130" | .236" |
| QL 5626 | window compression | .374" | kerf slot | .106"-.118" | .236" |
| QL 3009 | window compression | .351" | kerf slot | .106"-.118" | .236" |
| QL 48400 (U40) | window compression | .148" | t-slot | .210" | .050" |
| QL 48650 | window compression | .250" | t-slot | .210" | .050" |
| QL 48750 | window compression | .292" | t-slot | .210" | .050" |
| QL 69400 | window compression | .059" | t-slot | ||
| QL 69510 | window compression | .200" | t-slot | .310" | .050" |
| QL 69750 | window compression | .299" | t-slot | .310" | .050" |
| QL 48700 | window compression | .268" | t-slot | .189" | .050" |
| QL 48950 | window compression | .374" | t-slot | .188" | .037" |
| QL 7011 | window compression | .353" | t-slot | .194" | .091" |
| QL 70012 | window compression | .458" | t-slot | .270" | .050" |
| QL 70013 | window compression | .458" | t-slot | .190" | .092" |
| QL 3015 | surface mount seal | .315" | surface mount | - | - |
| QL 3116 | surface mount seal | .315" | surface mount | - | - |
| .650 (U71) | door kerf seal | .650" | kerf slot | .125" | .438" |
| .683 UD6 | door kerf seal | .683" | kerf slot | .125" | .438" |
| .730 (U64) | door kerf seal | .730" | kerf slot | .125" | .438" |
| .825 (U11) | door kerf seal | .825" | kerf slot | .125" | .438" |
| .875 (UC8) | door kerf seal | .875" | kerf slot | .125" | .438" |
| 70101 (U61) | door kerf seal | .218" | kerf slot | 1.688" | |
| 70102 (U76) | door kerf seal | .375" | kerf slot | 1.750" |
Need help selecting a Q-LON urethane weatherseal?
You don’t have to know exactly which Q-LON profile you need before reaching out. Quanex offers a broad range of weatherseal solutions, including Q-LON and other materials and configurations designed for different window and door applications.
Tell us what you’re working with, what you’re trying to accomplish, or where you’re running into a challenge. Our weatherseal experts can help you evaluate the available options and determine which solution best fits your application.
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This page was last updated on November 13, 2026. Downloaded document versions may differ. Please check the individual documents for most current version.