Surface-fit seals that perform on universal surfaces such as timber, aluminium and uPVC without frame modification.
Find the right seal for your application
Search by SKU code or category to find the right seal for your application.
Q-LON Seals - Universal Application Seals
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Q-LON Seals - Timber Window & Door Seals
High-performance Q-LON polyurethane foam seals engineered specifically for timber window and door frames.
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Q-LON Seals - uPVC Window & Door Gaskets
Precision-engineered Q-LON polyurethane foam seals for uPVC fabricators and OEMs worldwide.
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Q-LON Seals - Shutter & Partition Gaskets
Precision-engineered Q-LON foam seals for roller shutters, internal partitions and dividing systems across aluminium, PVC and timber frames.
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Q-LON Seals - Interior Application Seals
Schlegel Q-LON extruded seals for internal doors, furniture and window covering products. Engineered for acoustic control, dust exclusion and long-term compression recovery.
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Q-LON Seals - Aluminium Window & Door Seals
Schlegel Q-LON polyurethane foam seals for aluminium window and door frames: tested to EN 12365, built to perform.
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Why specify Schlegel weatherseals?
Schlegel products span every mainstream sealing technology: Q-LON polyurethane foam, woven and extruded brush pile, and Lozaron TPE/silicone extrusions. Each product is classified under EN 12365 with independently verified data covering working range, compression force, temperature range, deflection recovery and recovery after ageing, so fabricators and specifiers can match the right seal to the right performance requirement first time.
Key Benefits
Longer lasting
Compression recovery and technical quality
Quieter internal environments
Leading sound reduction from extensive testing
Energy savings
From very low thermal conductivity
Performance reliability
Minimal stretch during installation for minimal shrinkage over time
Better compression performance
Long-term set recovery 90% of original shape
Minimal risk of water ingress
Water resistant by design, with in-built inhibitors to provide a moisture barrier
Effortless glide
Low friction liners for sliding applications
Fast manufacturing
Bespoke designs support customer-specific production processes
Fuss-free cleaning
Unaffected by many popular solvents and cleaning products
Technical support
In-house engineers develop customer solutions
Key compliance
TFI certified to BS EN 12365
Peace of mind
Q-LON is guaranteed for 10 years
- Materials
- Colours
- Range Overview
- Downloads
Materials & Colours
The Schlegel Q-LON gasket, proudly made in the UK, is crafted from a unique polyurethane foam encased in weather-resistant polyethylene liner.
As the original innovation of its kind, Q-LON sets the standard for quality and performance in sealing solutions.
Q-LONs do not contain SVHC (Substances of Very High Concern) in a concentration above 0.1% by weight.
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Film
Polyethylene (PE) Film
Smooth or embossed surface. Weather and UV-resistant.
Foam
Polyurethane (PU) Foam Core
High durability, superior recovery performance.
Insert
Polypropylene (PP), Polycarbonate or with Glass Fibre Cord
Prevents elongation and shrinkage,
Standard and non-standard colour options across the range
Brush pile seals are available in standard colours including White, Brown, Grey and Black. Non-standard multifilament yarn options include Ivory, Iron Grey, Dark Beige and Sepia Brown. Q-LON foam seals carry a weather-resistant polyethylene liner available across a wide colour range to match timber, aluminium and uPVC frame finishes.
Standard
Brown - Standard RAL 8019
Black - Standard RAL 9005
White - Standard RAL 9003
Silver - Standard RAL 7001
Product Specific
Beige - Extra RAL 1001
Light Grey - Extra RAL 7035
Light Oak - Extra RAL 8003
Pebble Grey - Extra RAL 7032
Pure White - Extra RAL 9010
Fawn Brown - Extra RAL 8007
Graphite Grey - Extra RAL 7024
Seal selection by application: windows, doors and shutters
The table below maps each Schlegel product range to its recommended application, frame material and fitment method. Use it alongside the full performance data in the downloadable brochure.
Browse and download Schlegel product brochures, technical data sheets, EN 12365 classification tables and installation guides. Datasheets include dimensional tolerances, deflection recovery grades, compression force data and thermal conductivity values to EN ISO 10077-1.
Our seal ranges: Q-LON, brush pile and extruded
Q-LON is Schlegel's polyurethane foam gasket, made with a special foam core and weather-resistant polyethylene liner, available for timber, aluminium and uPVC frames. Q-LON Fire Retardant profiles are classified to EN 13501-1 Class E. Brush pile seals, made from polypropylene with optional silicone treatment, seal against moving elements and uneven surfaces. The extruded seal range combines TPE, foamed TPE, polypropylene and silicone profiles for fenestration, window covering and industrial applications.
EN 12365 classified across the full range
Every Schlegel seal carries a published six-digit EN 12365 classification covering working range, compression force, temperature range, deflection recovery and recovery after ageing, giving specifiers verified data to meet CE marking requirements.
Three sealing technologies, one supplier
Q-LON foam, polypropylene brush pile and extruded TPE/silicone profiles are all designed and manufactured within the Schlegel group, so fabricators source compression seals, sliding seals and gaskets from a single accredited manufacturer.
Dedicated products for every major frame material
Separate product lines cover timber, aluminium and uPVC frames. Each is engineered for the specific groove dimensions, surface finishes and performance demands of that material type, rather than adapted from a generic profile.
Fire-rated sealing without compromising weather performance
Q-LON Fire Retardant maintains the deflection recovery and air-sealing properties of the standard Q-LON range while achieving EN 13501-1 Class E classification, meeting the requirements of both building regulations and window energy performance standards.
Technical support for specification and selection
Schlegel's technical team supports product designers, fabricators and installers with seal selection guidance, EN 12365 classification data and thermal conductivity values to EN ISO 10077-1 for inclusion in window energy calculations.
Q-LON polyurethane foam seals
Q-LON is Schlegel’s polyurethane foam weatherseal with a weather-resistant polyethylene liner for long-lasting performance. Designed for timber, aluminium and uPVC windows and doors, it is available in kerf-fit, surface-fit and self-adhesive options. Q-LON recovers after compression in extreme temperatures. Q-LON FR meets EN 13501-1 Class E, while all seals offer a minimum 10-year lifespan and can be painted or stained.
Brush pile seals: woven and extruded formats
Schlegel’s brush pile seals include woven and extruded options for a wide range of sliding applications. Manufactured from UV-stable homopolymer polypropylene, they deliver reliable long-term performance. Woven seals feature fabric backings, while extruded versions use polypropylene or PVC-u carriers. Silicone-treated options resist water, mould and mildew, with fin configurations available to improve air-tightness where required.
Extruded seals: Lozaron, Nova-Seal and Foam-Tite
Schlegel’s Lozaron sealing range includes TPE, foamed TPE, polypropylene and silicone profiles for timber, uPVC and aluminium systems. Selected profiles combine Poly-Bond brush pile or Q-LON foam within a single carrier. The range also includes Nova-Seal for timber glazing applications and Foam-Tite compression seals in multiple profiles for dependable weather protection across modern frame systems.
Downloads, Accreditations & Related Products
Discover related products, access technical documentation and accreditations, and find out how Schlegel's 10-year guarantee gives you added peace of mind.
Brush Pile Seals
- UV stable and chemically inert for lasting performance
- Woven and extruded base options
- Backed by a 10-year guarantee
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Extruded Seals
- TPE, EPDM and polypropylene profiles
- Rigid extrusions and combination seals available
- Certified to BS EN 12365
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Resources
Find all the information you need at your fingertips for Q-LON, brush pile and extruded seals.
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Brochures
Explore Schlegel brochures and accreditation certificates to learn more about our products and manufacturing standards.
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Latest News
Keep up to date with Schlegel news and product updates.
Find out about our latest product launches, technical updates and industry news from Schlegel and the wider Quanex group.
News
BBC shines spotlight on Schlegel-backed programme inspiring future engineers
July 29, 2026
Schlegel, a Quanex company and leading manufacturer of high-performance sealing systems for windows and doors,...
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News
Quanex invests £1 million in UK manufacturing to strengthen Schlegel production capacity
July 29, 2026
Schlegel, a leading manufacturer of high-performance sealing systems for windows and doors, has seen its...
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Q-LON
More than a Seal
July 29, 2026
Driving innovation forward and supporting the future of the industry are just some of the...
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Technical information, brochures and product data sheets
Access the full Schlegel technical library including product data sheets for Q-LON, brush pile and extruded seals, downloadable brochures covering EN 12365 compliance, and installation guides for timber, aluminium and uPVC applications. All documents are available to download free of charge.