By Hilkem – Professional Sealant Solutions for Modern Infrastructure
When it comes to roads, highways, tunnels, and airfields, people often focus on the visible — smooth asphalt, bright markings, or wide lanes. But beneath the surface lies a critical component that determines how long the pavement will last: the road joint sealant.
At Hilkem, we specialize in advanced sealing solutions, including our high-performance GTK990 and GTK991 silicone joint sealants, engineered specifically for demanding infrastructure environments. So, what makes a good road joint sealant, and why should project managers, engineers, and governments care?
Why Joint Sealants Matter
Concrete and asphalt pavements naturally expand and contract due to temperature changes, heavy loads, and environmental exposure. Without a flexible and durable sealant in the joints, cracks can form, allowing water to seep in. This leads to:
● Pavement degradation
● Freeze-thaw damage
● Reduced service life
● Expensive repairs
A quality joint sealant ensures long-term pavement integrity, saves costs, and increases road safety.
Introducing Hilkem GTK990 & GTK991: Built for Extreme Performance
GTK990 (self-leveling type) and GTK991 (non-sagging type) are single-component, neutral-curing silicone sealants developed for heavy-duty use in:
● Airport runways
● Highways
● Bridges
● Subways
● Tunnels
● Concrete and asphalt joints
Both sealants are designed to deliver outstanding weather resistance, elasticity, and long-term durability — even under the harshest conditions.
Key Advantages of Hilkem's Road Joint Sealants
✅ Outstanding Weatherability
Tested under artificial aging and UV exposure, GTK990/991 performs reliably from -40°C to +150°C, maintaining elasticity without cracking or brittleness.
✅ High Movement Accommodation
With displacement capacity up to +100% / -50%, the sealant adapts to joint movement without damage — critical for areas exposed to temperature swings or structural vibrations.
✅ No Primer Needed
Thanks to strong chemical bonding with concrete, these sealants offer excellent adhesion without primer, making them faster and easier to apply.
✅ Fast Curing & Easy Application
l Good extrudability at normal construction temperaturesl Tack-free in less than 1 hour (GTK990: 0.4h, GTK991: 0.7h)l Available in 25kg drums or 800g cartridges for various needs
✅ Low Modulus, High Elastic Recovery
The sealants exert low stress on concrete, reducing the chance of surface damage. With over 80% elastic recovery, they maintain tight seals through years of expansion and contraction cycles.
Where to Use GTK990/991?
These sealants are ideal for:
● Sealing joints in airport pavements
● Expansion and contraction joints in roads and bridges
● Subway tunnels and structural concrete slabs
● New road construction and repair projects
Environmentally Responsible and Long-Lasting
Although not marketed as “green” sealants, GTK990/991 contribute to sustainability by extending pavement life, reducing maintenance frequency, and minimizing material waste. Their long service life reduces the environmental cost of repeated roadwork and reconstruction.
Choosing the Right Type
| Product | Type | Best Use Case | Flow Behavior |
| GTK990 | Self-leveling | Horizontal surfaces (e.g., runways, roads) | Flows smoothly into joints |
| GTK991 | Non-sagging | Vertical or sloped joints (e.g., tunnel walls, bridge sides) | Holds shape on application |
Conclusion: Seal the Future with Confidence
A well-chosen joint sealant is the foundation of pavement durability. Hilkem’s GTK990 and GTK991 deliver unmatched performance, built to handle the real-world demands of infrastructure. Whether you're building a new highway or maintaining an airport runway, trust Hilkem to provide sealant solutions that stand the test of time.Discover more at www.hilkem.com or reach out to our technical team for tailored guidance on your next infrastructure project.
