Polyurethane vs. Silicone: Which Kingdeli’s Sealant Fits Your Project Best
Key Differences Between Polyurethane and Silicone Sealants
Chemical Composition and Material Properties
Polyurethane sealant and silicone sealant are made in different ways, which changes how they act. Polyurethane is a mix of isocyanate and polyol. This combo makes a seal that bends but stays tough. It dries when it hits wet air and sticks hard to stuff like wood or concrete. Take HY-922 Multiple Purpose Polyurethane Sealant, for example. It’s a one-part product that hardens with moisture and makes a strong, flexible joint that grabs most surfaces well.
Silicone sealant comes from siloxane polymers. It stays really stretchy after drying and can take heat or cold. HY-3300 Weatherproof Neutral Silicone Sealant is a one-part sealant that sets at room temperature. It’s awesome for building projects because it’s tough and dependable. This makes silicone great for jobs that need to stay flexible for a long time.
Performance Under Varying Environmental Conditions
Kingdeli’s silicone sealant handles rough weather like icy winters or hot summers. It also stands up to bright sun. HY-3300 works great from -50℃ to +200℃ after it dries. This makes it perfect for outdoor jobs where keeping out weather is a big deal.
Polyurethane concrete sealant, like HY-922, does fine in tough spots but might wear out faster in constant sunlight. It fights off scratches and bumps, though. Plus, you can paint it once it’s dry, which is nice for building projects that need to look good.
| Property | Polyurethane Sealants | Silicone Sealants |
| Chemical Composition | Isocyanate + Polyol (forms flexible, tough polymer) | Siloxane polymers (elastic, excellent thermal stability) |
| Curing Mechanism | Moisture-curing (one-component) | Room temperature curing (neutral, shelf-stable) |
| Adhesion | Excellent adhesion to most materials | Excellent adhesion, especially for glass and metals |
| Flexibility | Flexible but less so than silicone | High elasticity, long-term flexibility |
| Temperature Resistance | Moderate; less resistant to extreme heat/cold | Excellent; performs between -50℃ to +200℃ |
| UV Resistance | Moderate, can degrade with prolonged exposure | Excellent UV resistance, ideal for outdoor use |
| Abrasion Resistance | High, can be painted over once cured | Moderate, generally not for high-abrasion environments |
Durability, Adhesion, and Maintenance Comparison
Long-Term Performance Expectations
Silicone sealant lasts a long time because it doesn’t break down much in bad weather. For instance, HY-2300 Outdoor Neutral Silicone Sealant stays stretchy and keeps sun and rain from ruining it. It holds up in rough conditions.
Polyurethane concrete sealant, like HY-923 Low Modulus Polyurethane Sealant for Construction, seals well but might need fixing in sunny places. You may have to repaint or reseal it over time to keep it working.
Surface Compatibility and Ease of Application
Both sealants stick to things like concrete, metal, glass, and wood. Silicone sealant is better for smooth stuff, like glass or shiny tiles. HY-2100 General Use Neutral Silicone Sealant grabs tight to glass, aluminum, stainless steel, tiles, marble, and cement.
Polyurethane concrete sealant, like HY-925, works better on rough surfaces like concrete or brick. It holds on strong. Also, you can paint it after it dries, which is great for projects where looks are a big deal.
Applications and Benefits of Polyurethane Sealant
Ideal Use Cases for Polyurethane-Based Products
Polyurethane concrete sealant is awesome for joints that move a lot, like gaps in concrete floors or car parts. HY-923 seals building joints, tunnels, or settling gaps without cracking. It’s tough enough for shifting surfaces.
It’s also good for wet areas, like drains. HY-922 Multiple Purpose Polyurethane Sealant seals reservoirs, sewage pipes, and gaps underwater, making it great for projects with lots of water.
Advantages in Construction and Industrial Settings
In places that get shakes or bumps, like bridges or machine bases, polyurethane concrete sealant is super tough. Its paintable surface lets it fit into building designs without standing out.
For cars, like attaching windshields or body panels, HY-924 Polyurethane Adhesive For Windshield sticks tight and stays bendy after drying. This makes it a solid pick for car work.
When to Choose Silicone Sealant
Superior Flexibility and Weather Resistance
Kingdeli’s silicone sealant is built for tough jobs that need stretch in extreme weather. HY-763 Silicone Sealant for Marble and Concrete for Marble and Concrete holds up in bad weather, staying steady from -50℃ to 200℃. It’s perfect for harsh outdoor spots.
This makes it great for curtain walls, skylights, window or door edges, and bathrooms where mold might show up.
Common Scenarios for Silicone Usage
Use Kingdeli’s silicone sealant for:
Glass glazing, like HY-4300 Structural Silicone Sealant.
Bathrooms or kitchens, with HY-722 Sanitary Silicone Sealant.
Hot surfaces, like ovens or engine parts, using HY-939A Neutral Heat Resistant Silicone Sealant.
These products fight sun, wet conditions, mold, and won’t damage metals or delicate surfaces.
Overview of Kingdeli’s Sealant Solutions
The Evolution of Kingdeli as a Sealant Manufacturer
Since 1998, Kingdeli has grown big in Foshan, China, making sealants. With over 20 years of work on adhesives for cars and buildings, it’s known for good quality and new ideas. Its factory is 66,000 square meters and has over 200 workers. It pumps out 60,000 tons of sealants every year.
Selecting the Right Sealant Based on Project Requirements
Factors to Consider: Substrate, Movement, Exposure
When picking between polyurethane concrete sealant and Kingdeli’s silicone sealant:
Surface Type – Smooth stuff like glass works better with silicone. Rough stuff like concrete needs polyurethane.
Movement Needs – Joints that shift a lot do better with polyurethane’s strength.
Weather Conditions – Sunny or wet spots need silicone’s toughness.
Painting – If you want to paint it, go with polyurethane.
Mold Resistance – Bathrooms or kitchens need silicone to stop mold.
How to Match Kingdeli’s Products to Your Specific Needs
Here’s a quick guide:
| Application | Recommended Product |
| Outdoor Weather Sealing | HY-3300 Weatherproof Neutral Silicone |
| Concrete Expansion Joints | HY-923 Low Modulus PU |
| Sanitary Areas | HY-722 Sanitary Silicone |
| Vehicle Windshield Bonding | HY-924 PU Adhesive |
| Structural Glazing | HY-4300 Structural Silicone |
Explore more at our official site or contact our team directly for tailored recommendations.
Frequently Asked Questions (FAQ)
Q: What’s different about polyurethane and silicone?
A: Polyurethane concrete sealant sticks better to rough stuff like concrete but can fade in bright sun. Kingdeli’s silicone sealant stays stretchy longer and handles extreme heat or sun better.
Q: Can I paint Kingdeli’s silicone products?
A: No, Kingdeli’s silicone sealant is too smooth after drying, so paint won’t stick. If you need to paint, use polyurethane sealant like HY-925.
Q: What’s good for bathroom sealing?
A: Pick HY-722 Sanitary Silicone Sealant. It dries into a tough, stretchy seal that stops mold, great for wet spots like showers or sinks.
Q: How long until they dry?
A: Most Kingdeli one-part sealants start setting in minutes. They fully dry in 24–72 hours, depending on how damp the air is and how thick you put it on.
Q: How do I choose the right sealant?
A: Go to Kingdeli’s website or talk to them. They’ll help you find the best Kingdeli’s silicone sealant or polyurethane concrete sealant for your job.
Kingdeli makes strong products for all kinds of tasks. Check out their options to find what you need.