Pavement joints need sealing quickly and effectively. Whether it’s concrete-to-concrete or concrete-to-asphalt, the job demands a sealant that handles high movement, resists fuel, and lets traffic flow again fast. DOWSIL 890-SL is a self-leveling, ultra-low modulus silicone engineered to flow into irregular joints without tooling, curing rapidly to minimise disruption on site.

Why this product exists

Horizontal pavement joints are a hostile environment. They face constant thermal movement, UV exposure, traffic loads, and potential fuel spills. General-purpose sealants often fail early, leading to costly reworks and traffic delays. DOWSIL 890-SL was formulated specifically for these conditions. It provides an ultra-low modulus, self-leveling silicone solution that removes the need for tooling and, crucially, priming on Portland cement concrete and asphalt substrates, unlike typical general-purpose sealants.

The numbers that matter

This sealant offers an ultra-low modulus at a low 9 psi tensile stress at 150% elongation. This is critical for asphalt-to-concrete joints, where the low tensile strength of asphalt can be easily compromised by higher modulus sealants. With an impressive +100% extension and -50% compression capability, it accommodates the extreme expansion and contraction movements common in pavements. A skin-over time of under one hour means traffic can resume sooner, reducing site closure times and project costs. Its flexibility range of -29°C to 149°C ensures it performs reliably across Australia's diverse climates, from freezing nights to scorching summer days.

What it's like to use

DOWSIL 890-SL arrives ready-to-use and cold-applied, eliminating any heating or special preparation. Its self-leveling properties mean it flows directly into joint widths, even irregular or spalled ones, without the need for manual tooling. This saves significant labour time on larger projects. Unprimed adhesion to Portland cement concrete and asphalt further simplifies installation and reduces material costs. The product can be extruded in temperatures ranging from -29°C to 49°C, allowing for application in a broad range of site conditions. Ensure a compatible backer rod is correctly placed to control sealant depth and prevent three-sided adhesion, following the installation guide for specific joint designs and depths. Clean up is simplified with standard sealant cleaners such as Xylene for any uncured material.

Where this product excels

• Pavement Joint Sealing: Ideal for concrete-to-concrete and concrete-to-asphalt pavement joints in new construction, repair, or remedial applications.
• Irregular and Spalled Joints: Its self-leveling characteristic means it flows into gaps, making it highly effective for restoring watertight seals in compromised or uneven joints without extensive preparation.
• Airfield Applications: Designed to meet demanding aviation standards, making it suitable for sealing airfield taxiway and apron joints where fuel resistance and durability are paramount.
• Fast-Turnaround Roadworks: The quick skin-over time is invaluable for projects requiring minimal traffic disruption, such as patching or road repairs, allowing sections to reopen to traffic rapidly.

Choose this when

• When sealing horizontal expansion and control joints in concrete pavements that require significant movement accommodation.
• When creating durable, flexible seals between concrete and asphalt surfaces, including transitions.
• When you need a self-leveling sealant that does not require tooling, reducing labour time on large or irregular joints.
• When working on projects like roads, highways, bridges, or airfield infrastructure that demand fast traffic re-entry and fuel resistance.

Don't use this when

• Not for: Continuous water immersion or applications where the sealant will be permanently submerged.
• Not for: Totally confined spaces where atmospheric moisture cannot reach the sealant to initiate curing.
• Not for: Application to wet or damp asphalt or concrete pavements, as this can compromise adhesion and cure.
• Not for: Installation during inclement weather conditions, which can negatively impact cure and performance.
• Not for: Medical or pharmaceutical uses; the product is not tested or represented as suitable for these applications.