Written by

Danny Neill

Hybrid vs Silicone Sealants: Which is Right for Your Project?

Sealants are commonly used in construction, automotive, and industries to seal cracks, gaps, and joints between different surfaces.

Over the years, various types of sealants have been developed, ranging from simple silicone sealants to advanced hybrid polymer sealants.

In this article, we will explore the differences between hybrid polymer and silicone sealants.

We will also discuss their unique advantages, disadvantages, and typical uses.



Hybrid Polymer Sealants

Hybrid polymer sealants are a new addition to the sealant industry. Unlike traditional sealants, they are made by combining the benefits of polyurethane and silicone sealants.

Hybrid sealants are known for their superior bonding properties, exceptional flexibility, and long-lasting durability. They are also resistant to moisture, UV rays, and chemicals compared to silicone sealants.


Advantages of Hybrid Polymer Sealants:

  • Better bonding properties than Silicone Sealants: Hybrid polymer sealants are designed to form strong and permanent bonds between different surfaces. These bonds last longer without deteriorating or breaking down.

  • Longer-lasting durability: Hybrid polymer sealants are known for their excellent durability and lasting power. They can withstand harsh weather conditions, vibrations, and temperature changes without cracking or peeling.

  • Superior flexibility: Hybrid polymer sealants are highly flexible, which means that they can expand and contract with the surfaces they are attached to. This feature prevents cracking and breaking down over time.

  • Higher resistance to Moisture, UV Rays, and Chemicals: Hybrid polymer sealants are less likely to break down and lose their sealing properties when exposed to moisture, sunlight, and chemicals.

  • Non-toxic, Odorless, and Solvent-Free: Hybrid polymer sealants are safer and environmentally friendly than traditional sealants. They are also odorless, making them ideal for indoor applications.

  • Paintable and can be used on a broader range of substrates: Hybrid polymer sealants can be painted over, which makes them ideal for applications where aesthetics are important. They are also designed to work with a wide range of substrates, including metals, plastics, glass, and wood.


Disadvantages of Hybrid Polymer Sealants:

  • Not Suitable for Glazing: Hybrid Sealants are not suitable glazing purposes as they may not have the appropriate adhesive strength required for this application. Traditional Silicone Sealants are specifically designed and tested for glazing applications and provide strong bonding strength.

  • Higher in cost compared to Silicone Sealants: In general, Hybrid polymer sealants are more expensive than silicone sealants, which may be a concern for some budget-conscious customers.

  • May have longer curing times: Hybrid polymer sealants may require longer curing times before they can be sanded or painted over.


Typical Uses for Hybrid Polymer Sealants:

  • Sealing high traffic expansion joints in buildings, roads, and bridges: Hybrid polymer sealants are ideal for high-stress areas that require better adhesion and durability than silicone sealants.

  • Bonding and sealing of metal and plastic applications: Hybrid polymer sealants are compatible with a wide range of substrates and are designed to provide permanent bonding.

  • Marine and automotive applications: Hybrid polymer sealants can withstand harsh weather conditions, vibrations, and temperature changes, making them ideal for marine and automotive applications.

  • High-performance sealing in window framing, roofing, and plumbing applications: The superior bonding properties of hybrid polymer sealants make them ideal for sealing areas that are exposed to moisture and humidity, such as window frames, plumbing, and roofing applications.



Silicone Sealants

Silicone sealants have been in use for decades and are known for their resistance to extreme temperatures, moisture, and UV light. They are composed of inorganic silicon and oxygen molecules, which are more stable than organic molecules found in hybrid polymer sealants.

Silicone sealants have high elasticity and can maintain their shape and size under a wide temperature range, without losing their bonding properties.


Advantages of Silicone Sealants:

  • Excellent resistance to high temperatures, moisture, and UV: Silicone sealants can handle extreme temperatures, moisture, and sunlight exposure, making them ideal for outdoor applications.

  • Faster Curing Times: Silicone sealants cure faster compared to hybrid polymer sealants.

  • Reasonably Priced: Silicone sealants are generally more affordable than hybrid polymer sealants.

  • Easy to apply and remove: Silicone sealants can be applied easily and are easier to remove than Hybrid Sealants.

  • Highly flexible: Silicone sealants are highly flexible and can move with the surfaces they are applied to, making them ideal for applications that require stretchability, such as in plumbing and roofing applications.


Disadvantages of Silicone Sealants:

  • Lower adhesion properties: Silicone sealants do not have the same level of adhesion as hybrid polymer sealants.

  • Limited ability to bond to some substrates: Silicone sealants may not bond as well to some substrates compared to Hybrids, such as certain metals.

  • Cannot paint over: Silicone sealants cannot be painted over, which may be a problem for applications where aesthetics are important.


Typical Uses for Silicone Sealants:

  • Sealing and protecting frames around windows and doors: Silicone sealants can help protect against moisture seepage around windows and doors.

  • Sealing bathtubs, sinks, and shower trays: When using an Anti Mould Silicone Sealant, they ideal for sealing in areas that are exposed to water, such as bathtubs, sinks, and shower trays.

  • Sealing around electrical outlets, ductwork pipes, and chimneys: Silicone sealants can help seal gaps and crevices where pipes, ductwork, and chimneys meet walls.

  • Automotive and marine applications: Certain types of silicone sealants are popular in automotive and marine applications because of their resistance to moisture and extreme temperatures.

  • Sealing refrigeration units and freezers: Food-Safe Silicone sealants are ideal for sealing refrigeration units and freezers where moisture can cause rust and damage.


Hybrid Polymer vs Silicone Sealants:

When deciding between hybrid polymer and silicone sealants, it is important to consider the needs of the application.

Hybrid polymer sealants are ideal for applications where superior bonding and durability are needed, while silicone sealants are more suitable for applications that require resistance to extreme temperatures and moisture.

Hybrid polymer sealants are generally more expensive but provide superior adhesion and are paintable, while silicone sealants are more affordable and have faster curing times.



In conclusion, choosing the right sealant for your project is critical for ensuring a safe and long-lasting finish. As we have discussed, both hybrid and silicone sealants have their respective benefits and limitations, and it's essential to select the right one for the intended application.

Here at Platinum Chemicals, we offer a wide range of Soudal products, including hybrid and silicone sealants, that are specifically designed to meet the unique requirements of various construction and DIY projects. Our products are high-quality and reliable, and we are proud to be one of the leading UK suppliers of Soudal Products.

If you want to learn more about our range of Soudal sealants, be sure to check out our Soudal Hub Page on our website. It's the perfect place to browse our full Soudal range and find everything you need to know about these products, including their features, benefits, and application methods.

So, whether you are a DIY enthusiast or a seasoned professional, you can trust us to supply you with the right sealant that will meet your needs and exceed your expectations.


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