Every project relies on its joints, and the right joint sealant is what keeps them strong, safe, and compliant. Without proper sealing, structures become vulnerable to water ingress, air leaks, vibration damage, and even fire spread. Sealants aren’t just finishing touches—they are essential components for durability, compliance, and long-term project success.
At Danterr, we don’t just supply sealants; we collaborate with contractors, engineers, and project managers to match the right solution to each application. From concrete joint sealants in infrastructure projects to expansion joint sealants in high-rise towers, and fire-rated polyurethane sealants in critical safety zones, our goal is to keep your projects compliant, efficient, and built to last.
What are Joints Sealants and Why Are They Essential?
Joint sealants are products that are designed and used for the purpose of sealing and filling joints in concrete or other substrates. Their primary use is to prevent the infiltration of water, air, and debris, which can cause damage and reduce the lifespan of structures. These sealants make it possible for sections of a structure to move without cracking or losing adhesion. The effectiveness of sealants in construction projects lies in this aspect of reducing the isolation of joints, and increasing construction durability, attractiveness and overall functionality.
Key Benefits of Using Joint Sealants
- Durability: High-quality joint sealants from Danterr provide long-lasting protection against environmental pressures, ensuring structures remain safe and reliable over time.
- Flexibility: By accommodating natural movement between building elements, sealants prevent cracks and failures in both vertical and horizontal joints. This is essential for projects that experience constant stress, such as infrastructure works and transport facilities.
- Aesthetic Appeal: Sealants also protect the visual integrity of construction by preventing unsightly cracks and gaps, keeping both civil infrastructure and architectural finishes looking clean and professional.
- Cost-Effectiveness: Effective sealing reduces the need for frequent maintenance or repairs, helping project managers save on long-term costs while maintaining compliance.
- Sustainability: Modern sealants, including low-VOC and long-service-life formulations, contribute to greener outcomes. They reduce material waste, minimise maintenance cycles, and support sustainable construction practices.
Types of Joint Sealants for Construction
Not all joint sealants are created equal. Depending on the project, location, and compliance needs, contractors and engineers typically choose from three main categories: Polyurethane (PU), Hybrid (MS Polymer), and Fire-Rated Sealants.
- Polyurethane Sealants: The traditional choice for heavy-duty applications, PU sealants offer excellent flexibility, strong adhesion, and proven durability in exterior and structural joints. They are widely used as concrete joint sealants and expansion joint sealants across civil and commercial projects.
- Hybrid (MS Polymer) Sealants: A newer technology, hybrids (MS polymers) combine the flexibility of polyurethane with the clean finish and low-VOC benefits of silicones. They cure bubble-free, are paintable, and are particularly suited to projects where aesthetics and sustainability are priorities.
- Fire-Rated Sealants: When compliance with AS 1530.4 is essential, fire-rated solutions such as fire-rated polyurethane sealants or hybrid systems are required. These sealants provide passive fire protection by stopping the spread of flame, smoke, and hot gases through movement joints and expansion gaps.
Product Selection Guide by Danterr
A. Polyurethane (PU) Sealants
Fulaflex 550 PU Sealant is a high-quality polyurethane sealant used for sealing joints in concrete and masonry. It provides excellent adhesion, flexibility, and durability for both indoor and outdoor applications.
Benefits and Technical Specifications:
- Excellent adhesion to a variety of substrates.
- High flexibility, accommodating structural movements.
- Long-lasting durability, reducing the need for frequent reapplication.
- Suitable for both indoor and outdoor applications.
- Type: Polyurethane sealant
- Curing Time: Skin forms in 24 hours
- Application Temperature Range: 5°C to 35°C
- Colour: Available in grey
- Packaging: 600ml sausages
Fulaflex 570 FC PU Sealant is a fast-curing polyurethane sealant ideal for high-traffic areas. It offers excellent weather resistance and strong bond strength, making it suitable for various construction materials.
Benefits and Technical Specifications:
- Fast-curing properties, ideal for high-traffic areas.
- Excellent weather resistance, suitable for extreme conditions.
- High bond strength, ensuring joints remain sealed and protected.
- Versatile application, compatible with various construction materials.
- Type: Fast-curing polyurethane sealant
- Curing Time: Skin forms in 24 hours
- Application Temperature Range: 5°C to 35°C
- Colour: Available in grey and white
- Packaging: 600ml sausages
Fulaflex 650 FC Sealant is a heavy-duty polyurethane sealant designed for industrial and commercial use. It performs well in extreme conditions and provides high resistance to chemicals and environmental factors.
Benefits and Technical Specifications:
- Heavy-duty formulation, designed for industrial and commercial use.
- Superior performance in extreme conditions.
- High resistance to chemicals and environmental factors.
- Long-lasting protection, reducing maintenance costs.
- Type: Fast-curing polyurethane sealant
- Curing Time: Skin forms in 24 hours
- Application Temperature Range: 5°C to 35°C
- Colour: Available in grey
- Packaging: 600ml sausages
Bostik Seal N Flex® is a fast-curing polyurethane joint sealant designed for concrete and façade applications. It delivers strong adhesion and durability while reducing downtime on site.
Benefits and Technical Specifications:
- Fast-curing polyurethane joint sealant for concrete and façades.
- Excellent durability against weather, UV, and aging.
- Strong adhesion across multiple substrates.
- Reduces downtime with rapid cure and paintable finish.
- Type: Fast-curing polyurethane sealant
- Fire rating: Non-fire rated
- Movement capability: ±25%
- Cure rate: ~2.5–3 mm per 24 hrs
- Application temp: 5 °C to 35 °C
- Service range: –40 °C to +70 °C
- Colour: Available in grey
- Packaging: 600 ml sausages
Bostik Fireban® One is a fire-rated polyurethane sealant providing up to 4 hours fire resistance, perfect for dynamic joints in precast panels, tilt-up walls, and external façades.
Benefits and Technical Specifications:
- Fire-rated polyurethane sealant with up to 4 hrs fire resistance (AS 1530.4).
- Flexible (±25% movement) and UV/weather resistant.
- Ideal for precast panels, tilt-up construction, and external façades.
- Long-term durability with resistance to aging and fungus.
- Type: Fire-rated polyurethane sealant
- Fire rating: Up to 4 hrs (AS 1530.4)
- Movement capability: ±25%
- Cure rate: ~2 mm per 24 hrs
- Application temp: 5 °C to 35 °C
- Service range: –40 °C to +70 °C
- Colour: Available in limestone
- Packaging: 600 ml sausages
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B. Hybrid / MS Polymer Sealants
Sikaflex®-11 FC is a versatile MS polymer hybrid sealant and adhesive, paintable and low-VOC, making it ideal for schools, hospitals, and interior finishes.
Benefits and Technical Specifications
- Multi-purpose MS polymer hybrid sealant and adhesive.
- Paintable, low-VOC, and bubble-free curing.
- Excellent adhesion to concrete, masonry, wood, and metals.
- Ideal for schools, hospitals, and commercial interiors.
- Type: MS polymer hybrid sealant/adhesive
- Movement capability: ±20%
- Cure rate: ~3 mm per 24 hrs
- Application temp: 5 °C to 40 °C
- Colour: Available in grey
- Packaging: 600 ml sausages, cartridges
Sikaflex® Pro is a high-performance hybrid MS polymer sealant engineered for expansion and perimeter joints. It offers strong adhesion and excellent UV/weather resistance for long-lasting results.
Benefits and Technical Specifications:
- High-performance MS polymer hybrid sealant designed for expansion and perimeter joints.
- Excellent UV and weather resistance for long-term durability.
- Paintable finish, compatible with most common substrates.
- Supports both internal and external movement joints.
- Type: MS polymer hybrid sealant
- Movement capability: ±25%
- Cure rate: ~3 mm per 24 hrs
- Application temp: 5 °C to 40 °C
- Colour: Available in grey and dark grey
- Packaging: 600 ml sausages, cartridges
C. Fire-Rated / Passive Fire Protection Sealants
Promaseal® FyreStrip is an intumescent joint sealant strip that expands under heat to block fire and smoke. Ideal for concrete expansion joints and movement joints in walls and slabs, tested to AS 1530.4.
Benefits and Technical Specifications
- Highly compressible intumescent joint sealant strip for static joints.
- Expands up to 9x its size under fire to block smoke and flames.
- Proven durability and compliance with AS 1530.4 (up to 240 minutes).
- Ideal for concrete expansion joints, movement joints, and compartment walls.
- Type: Intumescent strip fire barrier
- Fire rating: Up to 240 minutes (AS 1530.4:2014)
- Expansion ratio: ~9:1 when exposed to 185 °C+
- Colour: Standard black
- Packaging: Supplied in cut lengths/strips (various sizes available)
Promaseal® A Acrylic Sealant is a fire-rated sealant that seals joint surfaces for airtightness and smoke control. Commonly used with FyreStrip in expansion joint sealant systems to meet AS 1530.4 compliance.
Benefits and Technical Specifications:
- Water-based fire-rated sealant that complements FyreStrip for layered fire protection.
- Provides a smooth, airtight finish with excellent smoke control and acoustic performance.
- Tested to AS 1530.4, suitable for static fire-rated wall and floor joints.
- Low VOC, easy to apply, and paintable for clean finishes.
- Type: Acrylic fire-rated joint sealant
- Fire rating: Up to 240 minutes (AS 1530.4:2014)
- Curing time: ~1 mm per 24 hrs (depending on conditions)
- Application temperature range: 5 °C to 40 °C
- Colour: Available in grey and white
- Packaging: 600 ml sausages, cartridges
Critical Accessories for Sealant Performance
To ensure the best results when using joint sealants, Danterr also offers a range of complementary products:
Backing Rod is a closed-cell polyethylene foam rod used to control the depth of sealant application in joints. It ensures optimal sealant performance and durability.
Benefits and Technical Specifications:
- Controls the depth of sealant application for optimal performance.
- Provides a proper profile for the sealant, enhancing joint durability.
- Easy to install, reducing application time.
- Material: Closed-cell polyethylene foam
- Sizes: 6mm x 250m, 10mm x 200m, 13mm x 100m, 15mm x 100m, 20mm x 60m, 25mm x 50m, 30mm x 50m, 40mm x 2m, 50mm x 2m
- Temperature Resistance: -40°C to 90°C
- Packaging: Coils of various lengths
Bond Breaking Tape is a polyethylene tape used to prevent sealant adhesion at the base of the joint. It allows the sealant to move freely, reducing stress and extending its lifespan.
Benefits and Technical Specifications:
- Prevents adhesion at the base of the joint, allowing sealant to move freely.
- Reduces stress on the sealant, increasing its lifespan.
- Easy to apply, ensuring a smooth installation process.
- Material: Polyethylene
- Width: Available in 25mm, 50mm, and 100mm
- Length: Rolls of 50m
- Temperature Resistance: -40°C to 80°C
How to Apply Joint Sealants for Maximum Effectiveness
- Surface Preparation – Clean the joint thoroughly. Surfaces must be dry, sound, and free of dust, grease, or laitance to ensure proper adhesion.
- Install Backing Material – Insert a Backing Rod to control joint depth and profile. Apply Bond Breaking Tape if required, to prevent three-sided adhesion.
- Apply the Sealant – Using a sealant gun, apply the product evenly along the joint, ensuring full contact with both sides of the substrate.
- Tool the Joint – Smooth and compress the sealant with a suitable tool or spatula. This ensures proper adhesion, removes trapped air, and gives a neat finish.
- Curing & Protection – Allow the sealant to cure undisturbed. Protect the joint from water, dust, or traffic during the initial curing period (time varies by product).
For more information on our joint sealant products and their applications, check out our Essential Guide to Concrete Jointing Systems in Construction.
Conclusion
The right joint sealant is critical to project durability, compliance, and performance. From concrete expansion joints to movement joints and fire-rated applications, the correct choice prevents failures, reduces maintenance, and supports long-term success.
At Danterr, we don’t just supply products — we provide guidance. Whether you need a polyurethane sealant, a hybrid MS polymer solution, or a fire-rated polyurethane sealant, our team helps you match the right technology to your project.
Need help specifying? Contact Danterr for expert guidance and project-specific pricing.
📞: 1800 262 383
📧: [email protected]
Frequently Asked Questions:
Joint sealants are flexible materials used to fill and seal joints in construction, particularly in concrete and other substrates. They prevent the infiltration of water, air, and debris, which can cause structural damage over time. By maintaining the integrity of joints, sealants help ensure the longevity and durability of buildings, bridges, and other structures.
Joint sealants are essential in construction because they protect the structural integrity of buildings and infrastructure. They prevent water, air, and debris from penetrating joints, which can lead to erosion, cracking, and other damage. This not only extends the lifespan of structures but also reduces maintenance costs and enhances safety.
A backing rod is used to control the depth of the sealant application, ensuring that the sealant fills the joint effectively without excessive use. It also provides a proper profile for the sealant to adhere to, enhancing the durability and performance of the sealant. Backing rods are easy to install and help in achieving a professional and efficient seal.
A fast-curing sealant, such as the Fulaflex 570 FC PU Sealant, forms a skin quickly after application, typically within 24 hours. This makes it ideal for high-traffic areas or projects requiring a quick turnaround. Fast-curing sealants are known for their excellent weather resistance and high bond strength, ensuring durable and long-lasting protection.
Joint sealants contribute to sustainability by providing long-lasting protection, reducing the need for frequent repairs and replacements. Danterr’s sealants are designed to be environmentally friendly, with low VOC emissions. This minimises environmental impact and supports the creation of greener, more sustainable construction projects.
The curing time for joint sealants, such as those offered by Danterr, typically involves forming a skin within 24 hours. Full curing can take longer, depending on the specific product and environmental conditions. Proper curing ensures a durable and effective seal that maintains the structural integrity of the joint.
Polyurethane sealants, like those offered by Danterr, provide excellent flexibility, adhesion, and durability. They are suitable for a wide range of construction applications, accommodating structural movements without cracking. Polyurethane sealants also offer resistance to weathering, chemicals, and environmental factors, making them a reliable choice for long-term joint sealing.
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