Key Features of a uPVC Bubble (Q) Gasket

• Design and Functionality: The “bubble” or “Q” profile is designed to be highly compressible. When a window or door is closed, the bubble part of the gasket is squeezed, effectively filling the gap between the sash and the frame. This creates an airtight and watertight barrier, preventing drafts, water ingress, and noise.

• Materials: These gaskets are typically made from a synthetic rubber material like EPDM (ethylene propylene diene monomer) or TPE (thermoplastic elastomer) for standard bubble gaskets. For “Q” gaskets, the material is often a polyurethane foam core with a polyethylene cladding, known by the trade name Q-Lon.

• Q-Lon Gaskets: The Q-Lon material is a premium type of “Q” gasket that offers superior performance. Its key benefits include:

  • Excellent Compression Recovery: Q-Lon gaskets are known for their ability to return to their original shape after being compressed, providing a long-lasting and effective seal.

  • Durability: They are highly resistant to UV rays, extreme temperatures (from as low as -20°C to as high as 70°C), and harsh weather.

  • Low Friction: The polyethylene cladding allows the gasket to be clean to the touch and resistant to dirt and grime.

• Installation: Both standard bubble and Q-Lon gaskets are typically “push-in” fit, meaning they can be installed by simply pressing them into a groove around the window or door frame without the need for adhesive or special tools.