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Use Dowsil™ 890-SL Silicone Joint Sealant for: Concrete and asphalt pavement joints, new construction, and remedial applications.
Dowsil™ 890-SL Silicone Joint Sealant is a one-part, self-levelling silicone material designed for sealing concrete and concrete-to-asphalt pavement joints. Its ultra-low modulus and high movement capability make it ideal for accommodating significant pavement movement, ensuring long-term seal integrity. This sealant is weather and UV resistant, fuel resistant for short-term exposure, and offers unprimed adhesion to Portland cement concrete and asphalt, reducing labour and material costs. With a fast skin-over time, roadways can be quickly reopened to traffic, minimising disruption.
Key Features of Dowsil™ 890-SL Silicone Joint Sealant
- Self-Levelling: No tooling required, simplifying application and saving labour.
- High Movement Capability: 100% extension and 50% compression, accommodating significant pavement movement.
- Ultra-Low Modulus: Minimises stress on asphaltic joints, preventing premature failure.
- Unprimed Adhesion: Reduces preparation time and costs, enhancing efficiency.
- Fast Skin-Over Time: Allows for quick reopening of roads to traffic, minimising disruption.
- Fuel Resistance: Suitable for areas with potential fuel spills, enhancing durability.
- Weather and UV Resistant: Ensures long-term performance in outdoor environments.
Technical Overview
Dowsil™ 890-SL is a one-part, cold-applied, self-levelling silicone that cures to an ultra-low-modulus silicone rubber upon exposure to atmospheric moisture. It has a Shore 00 durometer hardness of 41 and an ultimate elongation of 1400%. Its specific gravity ranges from 1.26 to 1.34.
Chemical Properties: One-part, cold-applied, self-levelling silicone sealant with excellent weather and UV resistance.
Application Temperature Range: Can be extruded from -20 to 120°F.
Application Information
- Required Tools: Caulking gun (for cartridges), bulk dispensing equipment (for pails/drums), backer rod.
- Trade-Specific Tips: Ensure joints are clean and dry. Use proper backer rod installation to prevent three-sided adhesion. Recess sealant as recommended for pavement grinding.
- Common Issues and Solutions: Avoid application on wet or damp surfaces or during inclement weather. Follow joint design recommendations forStorage Requirements: Store in original, unopened containers at or below 32°C (90°F).
- Shelf Life Information: Refer to product packaging for “Use By” date.
- Temperature Considerations: Keep containers tightly closed and avoid storing in high temperatures.
Certifications
- ASTM D 5893 Type SL
- FAA P-605 for silicone joint sealants
- Meets SS-S-200E (section 4.4.12) Flame Test Requirements
- EN 14187-5 Hydrolysis Test
- EN 14188-2 Class B, C and D
Frequently Asked Questions About Dowsil™ 890-SL Silicone Joint Sealant
Q: Can Dowsil™ 890-SL be used for both concrete and asphalt joints?
A: Yes, Dowsil™ 890-SL is designed for both concrete-to-concrete and concrete-to-asphalt pavement joints.
Q: Does Dowsil™ 890-SL require primer for application?
A: No, Dowsil™ 890-SL offers unprimed adhesion to Portland cement concrete and asphalt, reducing the need for primer.
Q: How long does Dowsil™ 890-SL take to cure?
A: Dowsil™ 890-SL typically cures in 21 days at 73°F (25°C) and 50% RH.
Q: Can Dowsil™ 890-SL be used in cold weather?
A: Yes, Dowsil™ 890-SL can be extruded from -20 to 120°F, making it suitable for a wide range of temperatures.
Q: What safety precautions should I take when using Dowsil™ 890-SL?
A: Read the product and safety data sheets before handling. Ensure proper ventilation. Dispose of waste according to local regulations.
Use Dowsil™ 890-SL Silicone Joint Sealant for:
- Concrete to concrete pavement joints.
- Concrete to asphalt pavement joints.
- New construction pavement joints.
- Repair and remedial pavement joint applications.
- Irregularly shaped and spalled joints.
Why Use Dowsil™ 890-SL Silicone Joint Sealant:
- Self-Levelling: Simplifies application and saves labour.
- High Movement Capability: Accommodates significant pavement movement.
- Ultra-Low Modulus: Minimises stress on joints.
- Unprimed Adhesion: Reduces preparation time and costs.
- Fast Skin-Over Time: Allows for quick reopening of roads.
- Weather and Fuel Resistant: Ensures long-term durability.
How to apply Dowsil™ 890-SL Silicone Joint Sealant:
- Preparation: Clean joints and remove any debris.
- Backer Rod Installation: Install backer rod to proper depth.
- Application: Apply Dowsil™ 890-SL using a caulking gun or bulk dispensing equipment.
- Finishing: Allow sealant to self-level; no tooling is required.
- Curing: Allow sealant to cure for 21 days at 73°F (25°C) and 50% RH.
Dowsil™ 890-SL Silicone Joint Sealant limitations:
- Not recommended for continuous water immersion.
- Should not be applied in totally confined spaces.
- Avoid application on wet or damp surfaces or during inclement weather.
- Consult Dow for airfield runway applications.
- Not for spill containment areas.
- Not for medical or pharmaceutical uses.
Safety precautions when using Dowsil™ 890-SL Silicone Joint Sealant:
- Safety Data Sheets: Read product and safety data sheets before use.
- Handling: Use proper protective equipment.
- Disposal: Dispose of in accordance with local, state, and federal regulations.
Dowsil™ 890-SL Silicone Joint Sealant can be used on the following substrates:
- Concrete pavements
- Asphalt pavements
- Concrete to asphalt joints
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