Potable water certification for critical facade joints. When a reliable, elastic sealant is needed for concrete and masonry that meets AS/NZS 4020:2018, Sikaflex PRO delivers. It ensures durable, flexible seals in movement and connection joints, even where drinking water contact is a factor.
Sikaflex PRO is formulated as a 1-component, moisture-curing polyurethane sealant specifically engineered for elastic movement and connection joints. It addresses the critical need for a high-performance sealant that adheres effectively to porous substrates like concrete and masonry, while also carrying essential potable water approval. This formulation prioritises durable flexibility, making it suitable for both general internal and external sealing, especially where AS/NZS 4020:2018 compliance is non-negotiable.
With a movement capability of ±25%, Sikaflex PRO accommodates the dynamic shifts inherent in building facades and large concrete elements, preventing premature failure. A Shore A hardness of approximately 25 means it remains elastic and flexible, while its impressive 750% tensile strain at break provides a substantial safety margin against unexpected stress. It cures at approximately 3 mm per 24 hours, offering a practical working and tooling window for effective application.
Sikaflex PRO provides a generous tooling time of approximately 150 minutes, allowing for precise joint finishing. Substrates must be clean, dry, and sound. For optimal adhesion in critical applications or on specific substrates, Sika Aktivator-205 or Sika Primer-3 N may be required, particularly on porous materials like concrete or masonry. A closed-cell polyethylene foam backer rod ensures correct joint geometry and prevents three-sided adhesion. Tools should be cleaned immediately after use with Sika Remover-208.
Sikaflex PRO excels in critical building details such as cavity wall terminations and vertical upturn chase details, where it serves as a robust and approved sealant. It is highly effective for movement and connection joints in concrete and masonry facades, where its ±25% movement capability ensures long-term flexibility against thermal cycling. This sealant is also a primary choice for general indoor and outdoor sealing, especially when AS/NZS 4020:2018 potable water approval is a core requirement, making it suitable for sealing joints in structures related to drinking water.
This product is consistently specified as the final sealant in critical waterproofing and facade systems. For instance, in a vertical upturn termination chase detail, Sikaflex PRO acts as the approved sealant, securing the integrity of the junction. Similarly, in pipe and post detailing, it provides the essential, durable seal where penetrations occur through critical elements.
While both Sikaflex PRO and Sikaflex-11 FC are versatile 1-component polyurethane sealants with excellent workability, Sikaflex PRO stands apart with its crucial AS/NZS 4020:2018 potable water approval. This makes Sikaflex PRO the definitive choice for applications where the sealant must come into contact with drinking water, such as in water storage or treatment facilities, or specific facade elements that interface with rainwater harvesting systems. For general sealing and bonding tasks where potable water approval is not required, Sikaflex-11 FC remains a strong option.
Yes, Sikaflex PRO is approved for potable water contact. It meets AS/NZS 4020:2018 for use in applications where it will be exposed to drinking water.
Sikaflex PRO offers a movement capability of ±25%. This allows it to accommodate significant expansion and contraction in joints without compromising the seal.
No, Sikaflex PRO is not recommended for use on natural stone. Refer to the product limitations to avoid potential issues.
Most conventional facade paint systems can be used over Sikaflex PRO. Conduct trials to confirm compatibility and allow the sealant to fully cure first. Non-flexible paints may crack if applied to the elastic sealant.
| Application | Key benefit | Primary trades |
|---|---|---|
| Movement joints in concrete and masonry facades | Accommodates ±25% joint movement, preventing cracking and ensuring long-term weathersealing. | Concrete contractors, bricklayers, facade installers |
| Connection joints on porous substrates | Forms a strong, elastic seal on common building materials, preventing moisture ingress and air leaks. | General builders, tilers, renderers |
| Potable water applications | AS/NZS 4020:2018 approval ensures safety and compliance for drinking water contact. | Plumbers, water treatment specialists |
| General indoor and outdoor sealing | Good workability and adhesion simplifies application across a broad range of typical sealing tasks. | General builders, renovators, maintenance teams |
The foundation of a durable seal is a properly prepared substrate. Ensure the surface is structurally sound, clean, and dry.
Use a wire brush, grinding, or sandblasting to remove all laitance, dust, and loose material. Remove all contaminants like form-release agents, curing compounds, and old sealant residues.
Clean with a suitable solvent and a clean, lint-free cloth. For metals, light abrasion may be required to remove oxidation. Always perform a final wipe to remove any residues.
For critical applications, priming is essential for optimal adhesion. Backing rods are non-negotiable for controlling sealant depth and preventing three-sided adhesion.
Apply the recommended Sika primer or activator in a thin, continuous film using a brush or clean cloth. Avoid ponding or over-application.
Insert a closed-cell polyethylene foam backing rod to the required depth to achieve the correct width-to-depth ratio (typically 2:1). Ensure the rod is compressed by approx. 25% to hold it in place.
Proper application and tooling are crucial for a professional finish and long-term performance.
Cut the nozzle to the required bead size. Extrude the sealant into the joint from the base, ensuring continuous, uniform application and avoiding any air entrapment.
Firmly tool the sealant against the joint sides and backing rod. Use a spatula or slicker with a suitable tooling agent (e.g., Sika® Tooling Agent N) to create a smooth, concave finish that sheds water.
Warning: This product is a combustible liquid and harmful to aquatic life.
Wear chemical-resistant, impervious gloves (butyl rubber/nitrile rubber recommended) and safety glasses. Follow AS/NZS 1337.1 for eye protection and AS 2210:3 for protective clothing (e.g., long-sleeved working clothing, long trousers).
Ensure adequate ventilation and/or engineering controls are in place to prevent exposure to vapours.
Store in original, unopened, undamaged packaging in dry conditions between +5 °C and +25 °C, protected from direct sunlight. Shelf life is 12 months from production date. Dispose of contents and container at an approved waste disposal plant. Clean tools immediately after use with Sika Remover-208 or Sika TopClean T; cured material must be removed mechanically.
Correct substrate preparation is critical for durable adhesion and long-term performance, preventing callbacks and ensuring a secure bond.
Surface prep: Substrate must be clean, dry, sound, and homogeneous. Ensure it is free from oils, grease, dust, and loose particles. For high-performance or critical joints, always pre-treat.
Primer: Required. Prime using Sika Primer-3 N applied with a brush. Allow a flash-off time of 30 minutes to 8 hours before sealing.
Surface prep: Substrate must be clean, dry, sound, and homogeneous. Ensure it is free from oils, grease, dust, and loose particles. For high-performance or critical joints, always pre-treat.
Primer: Required for optimal adhesion. Clean and pre-treat using Sika Aktivator-205, wiped on with a clean towel. Allow a flash-off time of 15 minutes to 6 hours before sealing.
Surface prep: Substrate must be clean, dry, sound, and homogeneous. Ensure it is free from oils, grease, dust, and loose particles. For high-performance or critical joints, always pre-treat.
Primer: Required. Clean and pre-treat using Sika Aktivator-205. After flash-off, apply Sika Primer-3 N with a brush. Allow a further flash-off time of 30 minutes to 8 hours before sealing.
Surface prep: Substrate must be clean, dry, sound, and homogeneous. Ensure it is free from oils, grease, dust, and loose particles. For high-performance or critical joints, always pre-treat.
Primer: Required. Clean and pre-treat using Sika Primer-215 applied with a brush. Allow a flash-off time of 30 minutes to 8 hours before sealing.
| Property | Value |
|---|---|
| Composition | Polyurethane |
| Density | 1.25 kg/l approx. |
| Shore A Hardness | 25 approx. (after 28 days) |
| Secant Tensile Modulus at 100% elongation (23 °C) | 0.35 N/mm² approx. |
| Secant Tensile Modulus at 100% elongation (-20 °C) | 0.50 N/mm² approx. |
| Tensile Strain at Break | 750% approx. |
| Movement Capability | ±25% |
| Elastic Recovery | 90% approx. |
| Tear Propagation Resistance | 5.5 N/mm approx. |
| Service Temperature | -40 °C to +70 °C |
| Sag Flow | 0 mm (20 mm profile, 50 °C) |
| Ambient Air Temperature for Application | +5 °C to +40 °C, min. 3 °C above dew point temperature |
| Substrate Temperature for Application | +5 °C to +40 °C |
| Curing Rate | 3 mm/24 hours approx. (23 °C / 50% r.h.) |
| Skinning Time | 170 minutes approx. (23 °C / 50% r.h.) |
| Tooling Time | 150 minutes approx. (23 °C / 50% r.h.) |
| Flash Point | ca. 63 °C (closed cup) |
| Vapour Pressure | 0.01 hPa |
| Water Solubility | Insoluble |
Here are some common examples on where Sikaflex Pro Polyurethane Sealant 300ml Cartridges used by our customers.
