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Silicone Sealants; What to know

 

When selecting a sealant for sealing window frames and door frames at reveal junctions, understanding the differences between low and high modulus silicone sealants is important:

Low Modulus Silicone Sealants:

  • Flexibility: Low modulus silicone sealants have higher elasticity and flexibility, making them ideal for joints that are prone to movement, such as those found in window frames.
  • Adhesion: They adhere well to a variety of surfaces, including glass, metal, and most building materials, providing a durable bond that can accommodate thermal expansion and contraction.
  • Applications: Low modulus silicone sealants are suitable for sealing joints with high movement capability, such as expansion joints and perimeter seals around windows and doors.
  • Durability: They offer excellent resistance to weathering, UV exposure, and temperature extremes, ensuring long-term performance and minimal maintenance requirements.

High Modulus Silicone Sealants:

  • Strength: High modulus silicone sealants have higher tensile strength and are less elastic compared to low modulus sealants, making them suitable for applications where structural integrity and rigidity are important.
  • Adhesion: While they still provide good adhesion to various substrates, high modulus sealants may not be as forgiving to joint movement as low modulus sealants.
  • Applications: They are commonly used in structural glazing applications, curtain wall installations, and other scenarios where a rigid bond is necessary to support the structural load.
  • Durability: High modulus silicone sealants offer excellent weather resistance and durability, making them suitable for exterior applications exposed to harsh environmental conditions.

Choosing the Right Sealant:

  • Joint Movement: Consider the expected movement of the joint when selecting between low and high modulus silicone sealants. For reveal junctions in window frames, where movement due to thermal expansion and contraction is common, low modulus sealants are typically preferred.
  • Application: Determine the specific requirements of the sealing project, such as the type of substrates involved, environmental exposure, and joint dimensions, to choose the most suitable sealant for optimal performance and longevity.
  • Compatibility: Ensure compatibility between the sealant and the materials being sealed, as well as any adjacent building components, to prevent potential issues such as adhesion failure or material degradation over time.

By understanding the characteristics and differences between low and high modulus silicone sealants, you can make an informed decision to effectively seal window frames at reveal junctions, providing durable and long-lasting protection against air and water infiltration.

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