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Soudal Silirub AQ is a specialist, high-performance silicone adhesive-sealant specifically formulated for glass-to-glass bonding in the construction and repair of aquaria and terraria. This high modulus, acetoxy cure silicone is 100% pure, contains no extenders, and becomes chemically inert once cured, making it completely safe for marine and freshwater life.
Silirub AQ offers excellent adhesion to glass and aluminium, is UV and seawater-resistant, and provides a permanently elastic seal that resists a wide range of chemicals, acids and alkalis. It is easy to apply, primerless, and EC1+ certified for low emissions, ensuring it is safe for indoor use.
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✔️ Specially formulated for full-glass aquaria and terraria with completely safe, non-toxic cured composition.
✔️ Contains no plasticisers or extenders, ensuring maximum bonding strength and long-term joint clarity.
✔️ High modulus silicone resists deformation and supports structural integrity under water pressure.
✔️ Primerless adhesion to glass and aluminium for quick, secure sealing without additional surface preparation.
✔️ Outstanding resistance to UV, weathering, seawater and algae ensures long-lasting, reliable outdoor performance.
Silirub AQ is a high-performance, single-component silicone sealant specifically engineered for the construction, bonding, and repair of full-glass aquariums and terrariums. Developed to meet the most stringent demands of aquatic and reptilian environments, this advanced sealant offers exceptional clarity, strength, and water resistance. Manufactured using 100% high modulus silicone, Silirub AQ cures through an acetoxy system and contains no plasticisers or extenders. This ensures a full-strength, crystal-clear cure that remains stable and safe in prolonged contact with aquatic life.
One of the standout qualities of Silirub AQ is its inert composition once cured. It does not release any substances that could endanger fish, reptiles, or aquatic plants, making it a trusted choice for creating habitats where water quality and biological stability are paramount. Unlike general-purpose silicones that may degrade or leach harmful compounds over time, Silirub AQ maintains its chemical stability in fully submerged conditions, preserving the integrity of the aquatic environment.
Silirub AQ provides superior adhesion to substrates commonly used in aquarium construction, such as glass and anodised aluminium. It forms a high-strength, permanently elastic joint that accommodates thermal movement and slight structural shifts without losing its seal. Its high modulus properties mean it resists deformation under pressure, making it particularly suitable for bonding panels in large or deep aquaria where internal water pressure is greater and structural strength is critical.
The formulation is designed to withstand a wide range of challenging conditions. Silirub AQ exhibits excellent resistance to ultraviolet light, seawater, and common cleaning agents, ensuring long-term performance in both indoor and outdoor installations. It is also highly resistant to biological growth such as algae and mould, maintaining a clean and professional appearance over time without requiring frequent maintenance.
With an EC1+ classification for very low emissions, Silirub AQ supports safer indoor air quality and is suitable for use in enclosed environments such as homes, offices, and pet stores. The product is easy to apply with a standard cartridge gun and adheres reliably without the need for primers on compatible surfaces. Its smooth extrusion and ease of tooling simplify the application process while ensuring a watertight, clean finish.
Once fully cured, Silirub AQ delivers a robust, long-lasting seal that will not shrink, crack, or degrade over time. Its resistance to mechanical stress and environmental exposure guarantees lasting performance in demanding aquatic setups. Whether constructing a bespoke aquarium, repairing a glass joint, or sealing a terrarium, Silirub AQ provides the specialist performance needed for high-stakes, water-retaining applications.
Safe for Aquatic Life: Once fully cured, Silirub AQ is chemically inert and non-toxic, making it completely safe for fish, amphibians, and other aquatic or reptilian organisms.
High Modulus Acetoxy Cure Silicone: The 100% silicone formula ensures strong structural adhesion with excellent tensile strength, ideal for high-stress bonding such as aquarium joints.
Primerless Adhesion on Most Substrates: No need for surface primers when applied to glass or aluminium, saving time and reducing preparation steps.
Excellent UV and Weather Resistance: Withstands exposure to sunlight, weather conditions and water immersion without degrading, yellowing or losing adhesion.
Resistant to Algae, Acids and Chemicals: Designed to maintain performance even when exposed to algae, saltwater, cleaning agents, acids and alkaline solutions.
Permanently Elastic and Durable: Maintains flexibility even after long-term use, absorbing movements or stress without cracking or shrinking.
Very Low Emission (EC1+ Certified): Emits minimal VOCs, making it a healthier choice for indoor environments and enclosed spaces such as aquaria rooms or laboratories.
Easy to Apply: Smooth, professional finish with simple application using standard caulking tools; cures to a tight, water-resistant seal.
Aquarium Construction: Ideal for building full-glass aquaria of various sizes, offering the strength and chemical stability required to withstand internal water pressure.
Aquarium Repairs: Perfect for resealing or repairing leaks in existing aquaria without risk of contaminating the tank environment after curing.
Terrarium Assembly: Provides secure glass-to-glass bonds for the construction of terraria, ensuring a sealed and structurally sound enclosure.
Glass Bonding Applications: Suitable for general-purpose glass bonding where structural clarity and reliable adhesion are required, such as display cases or custom tanks.
Use in Saltwater and Freshwater Environments: The seawater resistance makes it equally effective in marine tanks and freshwater setups, giving it broad compatibility.
Indoor and Outdoor Glass Sealing: Thanks to its UV and weather resistance, it can be used in aquaria or terraria that are placed in conservatories, greenhouses, or external areas.
When handling and applying Silirub AQ, standard hygiene practices must be observed. Always wear suitable personal protective equipment (PPE) including gloves and eye protection. Avoid prolonged skin contact and ensure adequate ventilation during application.
Small quantities of acetic acid are released during the curing process, which may cause mild irritation to sensitive individuals. It is important to consult the product label and the relevant Material Safety Data Sheet (MSDS) prior to use.
Once cured, Silirub AQ is completely inert and non-toxic, making it safe for use in aquaria populated by fish and other aquatic organisms.
Silirub AQ has been specifically developed for use on rigid glass surfaces. The substrate must be structurally sound and should comply with recognised standards for aquarium construction, particularly DIN 32622 for aquaria up to a maximum of 200cm x 60cm x 60cm.
The product adheres exceptionally well to clean, dry, dust- and grease-free glass without the need for any pre-treatment or primer. While Silirub AQ is designed for glass-to-glass bonding, a preliminary adhesion test is recommended when working with unfamiliar surfaces or assemblies.
All surfaces to be bonded must be clean, dry and free of dust, grease, oil, or other contaminants. Use a lint-free cloth and a suitable degreasing agent if necessary to remove any residues from the glass prior to application.
It is essential that all surfaces are fully dry to ensure proper adhesion. The glass edges must be carefully aligned, and sufficient reinforcement should be included to avoid flexing or movement during curing, which could compromise bond strength.
Silirub AQ should be applied using a caulking gun. Apply the silicone directly from the cartridge, ensuring a minimum bond thickness of 1mm is achieved. Apply the sealant evenly and smoothly along the entire bonding surface.
Once applied, finish the joint with a soapy solution to prevent surface skinning, and use a suitable smoothing tool such as a spatula to achieve a neat finish. The silicone should be allowed to cure fully before subjecting the joint to water or mechanical stress.
Never fill the aquarium or terrarium until the product has fully cured. Depending on ambient conditions such as temperature and humidity, full curing may take several days.
To accelerate curing, place a container of warm water inside the aquarium to increase humidity. Once curing is complete, rinse the interior of the tank with pure water to remove any residual acetic acid.
Coverage will depend on the size and number of joints, but typically a single 300 ml cartridge will yield approximately 10 to 12 linear metres of 5mm x 5mm bead.
Ensure that the finished bond line maintains the recommended minimum thickness of 1mm after curing.
Please refer to our Guide on How To Measure The Number of Tubes Required For the Job.
Silirub AQ cures by reaction with atmospheric moisture. The curing time depends on the thickness of the silicone layer, ambient temperature, and relative humidity.
A skin typically forms within 10 to 20 minutes, with a full cure occurring at a rate of approximately 2 to 3mm per 24 hours under normal conditions (23°C and 50% RH).
Full cure of thicker sections and seams may require several days.
Uncured silicone can be removed immediately using Soudal Swipex Cleaning Wipes or Soudal Silicone Remover Gel. Once cured, the sealant can only be removed mechanically.
Clean tools and equipment immediately after use. Avoid contamination of surrounding surfaces during application and clean up any spills promptly.
Silirub AQ complies with the requirements of DIN 32622 point 4.4.2.1 and meets LEED and SCAQMD Rule 1168 guidelines for low-emitting adhesives and sealants. It is not suitable for use on natural stone such as marble or granite, as it may cause staining.
The product should not be applied in direct contact with other reactive sealants unless the first sealant has fully cured. Aquaria constructed with Silirub AQ must be appropriately supported and must not be subjected to movement, pressure or water loading until the product has reached full cure.
Protect the bonded surfaces from shock and vibration throughout the curing period to ensure a strong, bubble-free seal.
A) Soudal Silirub AQ is a high-performance, acetoxy-cure silicone sealant specifically formulated for the construction and repair of aquariums and terrariums. Made from 100% pure high-modulus silicone without any extenders or plasticisers, it is designed for permanent glass-to-glass bonding in both marine and freshwater environments. Once cured, the product becomes completely inert and safe for aquatic life. It forms a strong, watertight, and flexible bond that withstands pressure, UV light, and prolonged water exposure, making it an ideal solution for hobbyists, commercial aquarium builders, and glass construction specialists alike.
A) Yes, once fully cured, Soudal Silirub AQ is completely safe for use in both freshwater and marine aquariums. The cured silicone is chemically inert and does not release any substances that could harm fish, amphibians, aquatic plants, or invertebrates. It is specifically designed for aquatic environments and has been formulated to avoid the use of plasticisers, extenders, or other compounds that might leach into the water, ensuring a stable and healthy ecosystem for all aquatic life.
A) Soudal Silirub AQ provides excellent adhesion primarily to clean, dry glass surfaces, which makes it ideal for aquarium and terrarium construction. It also adheres well to anodised aluminium. While the sealant may bond to other non-porous substrates, it is specifically engineered for glass-to-glass applications. It does not require a primer for proper adhesion, but it is always advisable to conduct a small compatibility test when working with unknown or mixed materials.
A) Yes, Soudal Silirub AQ is highly effective for repairing leaks in existing aquariums. It can be applied to internal or external seams once the affected area has been properly cleaned and dried. It is essential to ensure that all old sealant is removed and the surface is free from contaminants before applying fresh silicone. The tank must be left to cure completely before refilling with water or reintroducing fish to avoid contamination.
A) Soudal Silirub AQ cures by reacting with atmospheric moisture. Under standard conditions (23°C and 50% relative humidity), it forms a skin within approximately 12 minutes and cures at a rate of around 2mm per 24 hours. For full aquaria construction or repair, it is recommended to allow several days for the sealant to cure entirely, especially where thicker joints are involved. The aquarium should not be filled with water until full curing is confirmed.
A) Absolutely. Soudal Silirub AQ is specially formulated to resist seawater and is suitable for use in marine aquariums. Once cured, it remains unaffected by salt, humidity, or other harsh conditions commonly found in saltwater tanks. It also resists degradation caused by algae and other aquatic biological growth, making it a dependable choice for long-term performance in marine environments.
A) As an acetoxy-cure silicone, Soudal Silirub AQ does emit a mild vinegar-like odour during curing due to the release of acetic acid. This odour is temporary and dissipates once the product is fully cured. While it is not generally considered hazardous, users with sensitivities may wish to ensure adequate ventilation during application. Once cured, the sealant is completely odourless and safe for aquatic life.
A) For structural integrity and proper adhesion, Soudal recommends a minimum joint thickness of 1mm. The ideal joint dimensions for aquaria depend on tank size and internal water pressure. It is crucial to follow standard design specifications for aquarium construction, such as those outlined in DIN 32622, especially for tanks up to 200cm x 60cm x 60cm. Reinforcement and alignment during assembly are also important to avoid joint failure during curing.
A) Yes, Soudal Silirub AQ is suitable for terrarium construction. It provides secure glass-to-glass bonding, ensuring a watertight and structurally sound enclosure. Its chemical stability and mould resistance also make it ideal for habitats that house reptiles or amphibians. Whether for sealing panels, constructing custom designs, or making repairs, the product provides excellent clarity and a clean finish that blends well with terrarium aesthetics.
A) Like most silicone sealants, Soudal Silirub AQ is not typically paintable. Most paints do not adhere well to silicone surfaces due to their flexible and non-porous nature. However, in aquarium or terrarium applications, painting over the silicone is rarely necessary as it is usually concealed within structural joints.
A) All surfaces must be thoroughly cleaned, dry, and free from grease, dust, or old sealant residues. Use a lint-free cloth and a suitable degreaser to clean the bonding edges of the glass. Ensure no moisture remains before application, as this can compromise adhesion. Proper preparation is critical to achieving a strong, long-lasting bond and avoiding joint failure, especially in water-retaining applications.
A) Soudal Silirub AQ cures using atmospheric moisture, so moderate humidity is actually beneficial during curing. However, it should not be applied directly onto wet surfaces or during rainfall. If the humidity is very high, curing may accelerate, but it’s still important to follow best practice, ensuring clean, dry surfaces for reliable bonding. Increasing ambient humidity slightly can help when constructing larger aquaria to support faster cure rates.
A) Yes, Soudal Silirub AQ offers excellent UV resistance. It can be used in aquariums or terrariums placed in bright indoor spaces, conservatories, or even outdoor environments without suffering degradation or discolouration. The sealant maintains its elasticity and strength even after prolonged exposure to sunlight, making it suitable for installations exposed to natural light.
A) One standard 300ml cartridge of Soudal Silirub AQ typically yields around 10 to 12 linear metres of a 5mm x 5mm bead. Actual coverage depends on the number and size of the joints being sealed. For aquaria construction, careful calculation of joint dimensions is important to ensure the correct number of cartridges are used for complete sealing.
A) Yes, Soudal Silirub AQ is EC1+ certified for very low emissions, making it safe for indoor use and ideal for enclosed environments. It also complies with LEED and SCAQMD Rule 1168 guidelines, which support low-emitting adhesives and sealants. Its water-based, VOC-free formula ensures a healthier indoor atmosphere, especially in living areas or commercial aquarium setups.
A) While Silirub AQ is primarily formulated for glass-to-glass bonding, it also adheres well to anodised aluminium. It may bond to other non-porous materials, but glass is the primary substrate for which it has been tested and certified. For applications involving other materials, a compatibility test should be performed before proceeding with full application.
A) Always wear gloves and eye protection when applying Soudal Silirub AQ. Ensure the area is well ventilated due to the release of a small amount of acetic acid during curing. Do not smoke, eat or drink during application. The sealant must not come into contact with water or be exposed to mechanical stress until it has fully cured. Always consult the product label and safety data sheet for complete handling instructions.
A) Store Soudal Silirub AQ in its original, unopened packaging in a cool, dry place between 5°C and 25°C. The product should be protected from frost and direct sunlight. When stored correctly, Silirub AQ has a shelf life of at least 12 months. Always check the expiry date before use to ensure optimal performance.
A) Yes, Soudal Silirub AQ is specifically designed for constructing custom glass aquariums. Its high-strength adhesive properties and resistance to internal water pressure make it ideal for small to medium-sized aquaria built to standard specifications. For large aquariums exceeding conventional dimensions, structural calculations and glass thickness must be carefully considered, and adherence to DIN 32622 guidelines is strongly advised.
A) Soudal Silirub AQ can be applied at temperatures ranging from 5°C to 35°C and, once cured, can withstand temperatures from -60°C to +180°C. This wide temperature range ensures the sealant remains stable in a variety of environmental conditions, whether installed indoors or in external terrarium or conservatory environments. The silicone maintains flexibility and adhesion even when subjected to temperature fluctuations over time.
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