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Soudal SMX 506 is a premium hybrid glazing sealant formulated using advanced SMX® Hybrid Polymer Technology, specifically engineered for bonding and sealing self-cleaning glass surfaces such as SGG Bioclean® and Pilkington Activ Glass™.
Offering superior adhesion, excellent weather and UV resistance, and compatibility with a wide range of frame materials, SMX 506 delivers reliable long-term performance in demanding external environments. It is ISO 11600 G 25 LM compliant, solvent-free, and paintable with waterborne systems.
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✔️ Specially developed for safe, long-lasting sealing on sensitive self-cleaning glass like Pilkington Activ Glass.
✔️ Offers strong primerless adhesion to glass, wood, aluminium, PVC and damp substrates for versatile use.
✔️ Permanently elastic formulation accommodates thermal movement without compromising the joint seal.
✔️ Free from solvents, isocyanates and halogens for safe indoor use and environmentally conscious projects.
✔️ UV, weather and moisture resistant with a colourfast, paintable finish for neat, professional results.
Soudal SMX 506 is a next-generation hybrid polymer sealant engineered specifically for use on self-cleaning glass surfaces. These technologically advanced glass types require a specialist sealant that will not compromise their unique surface coatings, and SMX 506 delivers precisely that. Developed with Soudal’s proprietary SMX® Hybrid Polymer technology, it ensures reliable adhesion without the need for a primer, bonding effectively to a wide range of substrates including aluminium, steel, wood, and PVC—even when the surface is slightly damp. Its formulation allows it to remain permanently elastic, making it highly suitable for perimeter glazing joints subject to regular movement and thermal expansion.
SMX 506 is designed with health and environmental safety in mind. Free from solvents, isocyanates, halogens, and other harmful substances, it provides a low-emission solution suitable for both internal and external environments. Its chemically neutral composition makes it ideal for use in schools, hospitals, and residential properties where air quality and safety are essential. This environmentally responsible formulation contributes to a healthier working environment while offering superior sealing properties.
The durability of Soudal SMX 506 sets it apart from conventional glazing sealants. It is highly resistant to ultraviolet radiation, extreme weather, and moisture ingress, maintaining its performance even under harsh environmental conditions. Once cured, the sealant forms a bubble-free, uniform finish that delivers excellent shear strength and flexibility, ensuring the longevity of the seal in both static and dynamic applications. This makes it ideal for installations where long-term reliability is critical.
In addition to its technical performance, SMX 506 offers notable aesthetic benefits. It is colourfast and compatible with most water-based paints, allowing for a visually consistent finish in exposed glazing joints. The sealant’s smooth application and toolability using soapy water contribute to an efficient installation process, reducing site time while maintaining a high-quality appearance. These features make it particularly well suited to projects where the visual integrity of the seal is as important as its mechanical function.
Soudal SMX 506 has undergone rigorous testing to ensure its compatibility with specialist glazing products. It is fully approved for use with self-cleaning glass types such as SGG Bioclean® and Pilkington Activ™, meeting the specific demands of these coatings without affecting their hydrophilic or photocatalytic properties. Certified to DIN EN ISO 11600 G 25 LM, it satisfies the technical requirements for professional glazing applications in both domestic and commercial sectors.
Whether used in residential facades, public buildings, or high-spec commercial glazing projects, SMX 506 offers a dependable solution for modern sealing requirements. Its ability to combine high-performance bonding with environmental sensitivity and aesthetic refinement makes it a standout product in its category. For contractors and specifiers working with self-cleaning glass, SMX 506 ensures peace of mind with every installation.
When working with high-performance self-cleaning glass, such as Pilkington Activ™ or Saint-Gobain Bioclean™, it is critical to use a sealant specifically engineered and certified for compatibility with these specialist glazing systems. Soudal SMX 506 is purpose-formulated to bond securely to self-cleaning glass without compromising the integrity of the active surface coating. It complies with stringent requirements for use with self-cleaning technologies and has undergone extensive weathering and compatibility testing to ensure long-term performance.
Using a generic hybrid polymer sealant — even one marketed as “universal” or “suitable for glass” — may seem like a cost-effective alternative. However, these products often lack the precise formulation and independent testing required for use with coated glass. They may not offer the same level of UV resistance, chemical stability, or flexibility over time, and most importantly, they can interfere with or damage the hydrophilic surface layer of self-cleaning glass. This can result in discolouration, reduced self-cleaning functionality, or adhesive failure.
Additionally, many standard sealants do not comply with relevant industry standards for glazing installations, nor are they backed by the manufacturer warranties that come with approved products like SMX 506. For professional glazing work where longevity, appearance, and performance are essential — particularly in architectural or commercial applications — cutting corners with an uncertified product can lead to costly repairs or full glass replacement.
Choosing SMX 506 ensures correct adhesion, weather durability, and lasting compatibility with self-cleaning glass systems. It also guarantees that the installation meets the manufacturer’s recommendations and maintains any glass warranties in place. Always consult both the sealant and glass manufacturers before substituting with alternative products, regardless of supplier claims.
DIN EN ISO 11600 G 25LM Bioclean - Activ Glass (IFT Prüfbericht 504 34673).
ISO 11431 on SGG Bioclean® and Activ Glass™ (IFT Prüfbericht 504 28498/3).
Specially Formulated for Self-Cleaning Glass: Developed to bond effectively with glass types such as SGG Bioclean® and Pilkington Activ Glass™, Soudal SMX 506 provides a secure, lasting seal without compromising the hydrophilic coating of self-cleaning glass.
Excellent Weather and UV Resistance: This sealant maintains its physical integrity and elasticity under continuous exposure to sunlight, rain, wind, and temperature changes, making it ideal for external glazing applications.
Primerless Adhesion to Multiple Substrates: Adheres strongly without primer to a wide range of materials including timber, aluminium, steel, and PVC, even in slightly damp conditions, ensuring reliability across varied installations.
Solvent-Free and Environmentally Neutral: Free from harmful components such as isocyanates, solvents and acids, SMX 506 is safe for both users and the environment, reducing health risks and eliminating harmful emissions.
Paintable Wet-on-Wet: Can be painted over using most waterborne paints immediately after application, saving time on site and allowing for aesthetic flexibility in finished projects.
No Bubble Formation in High Humidity: Resists bubbling even in humid conditions, ensuring a smooth, professional finish free from sealant imperfections in critical areas.
High Movement Capability: Complies with ISO 11600 G 25 LM classification, which confirms its ability to accommodate joint movement without failure – vital for long-lasting perimeter sealing.
Perimeter Glazing of Self-Cleaning Glass Units: Ideal for sealing joints around self-cleaning glass installations such as SGG Bioclean® and Pilkington Activ Glass™, ensuring compatibility without affecting the self-cleaning surface properties.
Sealing Between Glass and Window Frames: Used to form durable, weatherproof joints between glazing panels and frames made of wood, PVC, aluminium or steel, offering strong adhesion and lasting elasticity.
Commercial and Residential Glazing Installations: Suitable for both small-scale domestic windows and larger commercial façade glazing systems, especially where self-cleaning glass is installed.
Weatherproof Sealing in Exposed Areas: Applied in environments exposed to significant weathering, such as conservatories, curtain walling, and glazed facades, to provide long-term protection against moisture ingress.
Projects Requiring Low-Emission Materials: Ideal for use in sustainable construction projects or interior environments with strict VOC regulations due to its EC1+ low emission classification and absence of hazardous ingredients.
When using Soudal SMX 506, standard labour hygiene procedures must be followed. Always wear suitable personal protective equipment, including gloves and eye protection.
Consult the product label and material safety data sheet (MSDS) prior to use for detailed health and safety guidance. Ensure the working area is adequately ventilated. Avoid skin and eye contact and do not ingest the product. Uncured sealant may cause skin irritation and prolonged exposure should be avoided. Keep out of reach of children.
Soudal SMX 506 is designed for bonding and sealing a wide range of glazing substrates including treated wood, painted aluminium, coated metal frames, UPVC, and specifically self-cleaning glass types such as Activ™ (Pilkington) and Bioclean™ (Saint-Gobain).
It adheres well to most non-porous construction materials. However, it is not suitable for polyethylene (PE), polypropylene (PP), polytetrafluoroethylene (PTFE, e.g. Teflon®), bituminous substrates, or copper and copper-containing alloys such as brass and bronze.
A preliminary adhesion and compatibility test is recommended on all surfaces, especially those coated with decorative paints or finishes, as some coatings may interfere with bonding performance.
All surfaces should be flat, load-bearing, clean, dry, and completely free from dust, grease, oil, rust, old sealants or any other contaminants that may hinder adhesion.
For non-porous materials, use Soudal Surface Activator or cleaner to pre-treat the substrate to enhance adhesion. Painted or anodised surfaces should be carefully assessed for compatibility and may require abrasion or testing prior to sealant application.
Self-cleaning glass must be handled with care to preserve its active coating; use non-abrasive methods for cleaning and avoid hard tooling during application.
Soudal SMX 506 should be applied using a standard or pneumatic caulking gun. Cut the nozzle to the required joint size and apply the product in a continuous bead, ensuring full contact with both sides of the joint. Avoid air pockets.
To ensure optimal adhesion, tool the sealant with a spatula or Soudal smoothing tool dipped in a mild soapy solution before skinning begins, which occurs after approximately 20 minutes at 23°C and 50% relative humidity.
When installing self-cleaning glass, maintain a minimum joint inclination of 10° to allow water drainage and ensure no ponding occurs.
The joint depth should always be sufficient to accommodate anticipated movement, and sealant thickness should be maintained between 1–2 mm after tooling.
Coverage depends on joint width and depth, but as a general guideline, one 290ml cartridge yields approximately 12 linear metres in a 5mm x 5mm joint. Variations in joint dimensions and application techniques will affect coverage.
Please refer to our Guide on How To Measure The Number of Tubes Required For the Job.
Once the product has been applied and smoothed, allow it to cure undisturbed. Avoid any mechanical stress or movement during the curing period, as this may compromise the integrity of the bond.
If painting over is desired, use paints that are compatible with neutral-cure silicone systems. Note that alkyd-based paints may exhibit slower drying times. All soapy residue from tooling must be removed prior to painting to avoid adhesion failure.
Discolouration from UV light or chemicals may occur, though this does not impact the performance of the sealant.
Uncured sealant can be removed from tools and surfaces using Soudal Swipex Cleaning Wipes or Soudal Sealant Remover Spray. Once cured, the sealant can only be removed mechanically. Clean hands and exposed skin with Swipex Wipes or warm soapy water immediately after use.
The curing speed of Soudal SMX 506 is approximately 2 mm per 24 hours under normal conditions (23°C and 50% RH).
The product is resistant to saltwater, diluted acids and alkalis, hydrocarbons, alcohols and aliphatic solvents, but not to chlorinated hydrocarbons, concentrated acids or aromatic solvents. Do not use this product in applications involving continuous water immersion or areas prone to rising damp.
The application temperature should be between 5°C and 35°C. Once cured, the sealant will withstand temperatures ranging from -40°C to +90°C.
Always respect the installation guidelines provided by the glass manufacturer when working with self-cleaning glass.
A) Soudal SMX 506 is a specialist hybrid polymer-based sealant specifically formulated for use with self-cleaning glass types, such as Pilkington Activ™ and SGG Bioclean®. It provides a durable, elastic, and weather-resistant seal for perimeter glazing and frame-to-glass joints, without compromising the delicate hydrophilic or photocatalytic coatings of self-cleaning glass surfaces. Designed for both domestic and commercial applications, this high-performance sealant is suited to installations that require UV stability, low emissions, primerless adhesion and compatibility with multiple construction materials, including timber, PVC, aluminium and steel.
A) Yes, Soudal SMX 506 is fully tested and certified for use with self-cleaning glass surfaces, including Pilkington Activ™ and SGG Bioclean®. Its neutral chemistry ensures that it will not degrade or affect the delicate coating that enables these glass types to maintain their self-cleaning function. Standard sealants often interfere with this coating, but SMX 506 has been developed and independently verified for compatibility, making it the ideal and recommended choice for such applications.
A) Unlike general-purpose sealants, Soudal SMX 506 is engineered specifically for bonding and sealing self-cleaning glass. Its hybrid polymer formula combines the flexibility and adhesion of silicone with the durability and paintability of polyurethane. It is solvent-free, has extremely low emissions (EC1+ certified), and resists UV, moisture, and weather extremes. Most importantly, it does not interfere with the unique surface treatments found on self-cleaning glass, unlike many other standard glazing mastics.
A) Yes, Soudal SMX 506 is highly suitable for exterior glazing applications. It offers excellent resistance to weathering, UV radiation, and temperature extremes. It maintains its bond and elasticity even under continual exposure to the elements, making it a reliable choice for curtain walls, conservatories, skylights and window perimeters that are installed outdoors. Its bubble-free curing technology ensures a clean, professional finish, even in high humidity.
A) Soudal SMX 506 adheres strongly to a wide range of common building materials, including glass, coated and painted aluminium, timber, uPVC, stainless steel, and galvanised metals. It bonds without a primer in most cases, even on slightly damp substrates, although a preliminary adhesion test is always recommended. It should not be used on polyethylene, polypropylene, PTFE (Teflon®), copper, or copper-containing alloys such as brass and bronze, as adhesion or staining issues may occur.
A) In most applications, Soudal SMX 506 does not require a primer. It adheres well to clean, dry substrates including self-cleaning glass and various frame materials without the need for pre-treatment. However, when dealing with painted surfaces or those with unusual coatings, conducting a preliminary adhesion test is recommended. On non-porous surfaces, Soudal Surface Activator can be used to further enhance bonding performance if required.
A) Yes, Soudal SMX 506 is paintable with most water-based paint systems. It allows for wet-on-wet application, meaning paint can be applied soon after tooling the sealant. However, alkyd-based paints may exhibit slower drying times, and compatibility testing is strongly recommended before full application. The sealant must be free from soapy residue or surface contaminants before painting to ensure proper adhesion of the coating.
A) Surfaces must be structurally sound, dry, clean and free from dust, oil, grease, or other contaminants that might interfere with adhesion. For self-cleaning glass, care must be taken to avoid scratching the coating. Clean using a lint-free cloth and a compatible glass cleaner or alcohol-based solution. For maximum bond strength on coated frames or difficult substrates, a compatibility test or surface activation may be necessary.
A) Soudal SMX 506 should be applied with a standard cartridge or pneumatic caulking gun. The nozzle should be cut to the desired joint width, and the sealant applied in a continuous bead to avoid air pockets. Immediately after application, the sealant should be tooled using a spatula or suitable smoothing tool dampened with soapy water. Tooling must be completed before skin formation occurs, typically within 20 minutes under normal conditions.
A) Yes, Soudal SMX 506 performs well in damp conditions and humid environments. It can be applied to slightly moist (not wet) surfaces and will cure without bubbling, even in high humidity. However, for best results and consistent finish, ensure surfaces are as dry as possible and that the ambient temperature is within the recommended range of 5°C to 35°C.
A) Under standard conditions (23°C and 50% relative humidity), Soudal SMX 506 forms a skin in approximately 20 minutes and cures at a rate of 2mm per 24 hours. Thicker applications or colder, more humid environments may increase curing time. It is important not to disturb the sealant during the curing period to ensure proper bonding and avoid aesthetic defects.
A) No, Soudal SMX 506 is not suitable for structural glazing applications where the sealant must bear the load of the glass. It is designed for perimeter and weather seals in non-loadbearing joints, particularly around self-cleaning glass installations. For structural glazing, a different Soudal product specifically certified for structural bonding must be used.
A) Yes, Soudal SMX 506 is safe and suitable for indoor use. Its solvent-free, isocyanate-free formulation and EC1+ low-emission classification make it ideal for environments with strict air quality requirements such as residential buildings, healthcare facilities, and schools. It produces no unpleasant odours and poses minimal health risks when applied with proper ventilation and personal protective equipment.
A) Soudal SMX 506 offers good resistance to biological growth such as mould and algae, especially in outdoor glazing installations where the seal is subject to rain and humidity. Its smooth, non-porous surface discourages the accumulation of dirt and microbial colonies, supporting long-term aesthetic and structural performance.
A) No, Soudal SMX 506 is not suitable for applications involving permanent immersion in water. It is highly water-resistant and ideal for exposed joints in outdoor environments but should not be used in conditions where the sealant will be continuously submerged, such as in swimming pools or water tanks. For submerged joints, alternative specialist sealants must be used.
A) The quantity of Soudal SMX 506 required depends on the joint dimensions and total length. As a general rule, a 290ml cartridge will provide around 12 linear metres of a 5mm x 5mm joint. Wider or deeper joints will reduce coverage. Always calculate the total joint volume and include a margin for wastage or touch-ups.
A) Soudal SMX 506 is typically available in white, grey, and black to match common frame and glass colours. The sealant is colourfast and UV stable, maintaining its appearance over time without yellowing or fading. For specific colour availability, check with your distributor or Soudal representative.
A) Soudal SMX 506 should be applied at temperatures between 5°C and 35°C. Once cured, it will tolerate service temperatures ranging from -40°C to +90°C, making it suitable for installations exposed to seasonal weather changes, including extreme cold or high summer heat.
A) Unopened cartridges of Soudal SMX 506 should be stored in a cool, dry place between +5°C and +25°C. Protect from frost, direct sunlight, and high temperatures. Once opened, use the cartridge as soon as possible to maintain optimal performance.
A) Soudal SMX 506 should not be applied in direct contact with other uncured reactive sealants, as this may lead to incompatibility or adhesion failure. It is also advisable to allow any coatings or paints in the contact area to fully cure before applying SMX 506. Always test paint compatibility in advance, particularly with solvent-based coatings, to avoid discolouration or surface defects.
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