When it comes to construction, renovation, or even simple home repairs, choosing the right sealant or adhesive can make a big difference in performance and durability. Two of the most popular options are silicone and polyurethane (PU). While they may look similar in a cartridge tube, their properties and applications are quite different. Let’s break it down so you can choose the right one for your project.
What is Silicone?
Silicone sealants are made from silicone polymers and are best known for their flexibility and weather resistance. Once cured, they remain elastic for many years without shrinking or cracking.
Key Advantages of Silicone:
- Extremely flexible — stays elastic long-term
- Excellent UV and weather resistance
- Withstands extreme temperatures (–50°C to +150°C or more)
- Ideal for glass, ceramics, and smooth, non-porous surfaces
Best Applications:
- Window and glass sealing
- Façades and curtain walls
- Bathrooms and kitchens (waterproofing)
- Joints exposed to high movement or temperature changes
Limitations:
- Not paintable
- Weaker adhesion on porous surfaces (concrete, wood, brick) without primer
What is Polyurethane (PU)?
Polyurethane adhesives and sealants are based on PU polymers and are known for their strength and versatility. They provide excellent adhesion to porous building materials and can be painted over after curing.
Key Advantages of Polyurethane:
- Strong adhesion to concrete, wood, brick, and metal
- Paintable after curing
- Resistant to impact and vibration
- Durable in construction environments
Best Applications:
- Expansion and construction joints
- Flooring joints
- Structural bonding (tiles, panels, skirtings, sills)
- General construction sealing and adhesive tasks
Limitations:
- Shorter UV resistance compared to silicone (may yellow or crack in strong sun)
- Lower temperature resistance (–30°C to +80°C)
Side-by-Side Comparison
Feature | Silicone | Polyurethane (PU) |
Flexibility | Very high, long-lasting elasticity | High, but stronger and stiffer |
UV & Weather Resistance | Excellent, long lifespan outdoors | Good, but less durable in strong UV |
Temperature Resistance | –50°C to +150°C+ | –30°C to +80°C |
Adhesion | Best on smooth, non-porous (glass, ceramic) | Best on porous (concrete, wood, brick, metal) |
Paintability | ❌ Not paintable | ✅ Paintable |
Durability | Very long-lasting | Strong and durable, but may age faster outdoors |
Best Use | Windows, bathrooms, glass façades | Floors, walls, structural joints |
Which One Should You Choose?
- Choose Silicone if you need weatherproofing, UV resistance, and high flexibility, such as in windows, facades, or bathrooms.
- Choose Polyurethane if you need strong bonding, paintability, and construction durability, such as in floor joints, walls, or general structural applications.
By understanding the differences between silicone and polyurethane, you’ll make sure your project lasts longer and performs better
At BBS, we can help you source the right sealant or adhesive for your project in Indonesia — whether you’re sealing glass, bonding panels, or insulating joints. Contact us today for expert advice and supply options.