Multi-Hollow Bulb Seals
Multi Hollow Bulb seals feature a dual-bulb design with an inner bulb that is designed to engage when the part is at 25% compression. This unique design significantly reduces initial closing forces and with excellent long term compression set resistance due to the outer bulb being supported by the inner bulb. The multiple hollow chambers also enhance the acoustical properties of the seal.
Multi Hollow Bulb seals incorporate Ultra Glide S®, a low friction material applied to specific areas on the surface, reducing friction and improving the smooth operation of the seals. These seals are ideal for applications that require both high sealing pressure and reduced operational force.
Features & Benefits
Sealing Technology Comparison
The features of this new technology are multiple. Utilizing the chart below, the characteristics of various compression seal technologies are evaluated based on criteria that is critical to any design engineer developing fenestration products where air and water penetration must be taken into account. The chart shown reviews the various parameters for a quick reference guide.
chart
Closing Force
During the early stages of compression the MHB seal requires minimal force. At the later stages of compression the outer bulb makes contact with the inner bulb and closing forces build rapidly to provide excellent sealing pressure against the mating surface. This high level of sealing pressure is what makes the seal extremely effective against air and water infiltration.
Compressions Set Analysis
Multi-Hollow Construction
The secret to the optimal performance of the new Multi-Hollow seal technology lies within its design. The addition of the internal seal cavity results in a configuration that is designed to reduce any loss of functional height, thus maintaining its original shape after multiple open/close cycles.
The MHB seals can also be “fine tuned” for specific applications by adjusting the relationship between the inner and outer bulbs. Designers can “dial in” the preferred closing force and seal pressure created at final compression point.
Slip Coat Option
All MHB seals come with the newly designed slip coat feature. This new technology allows for an EXTREMELY low co-efficient surface. When compared to other sealing technology, the new MHB seal mitigates the natural tendency to “bind or tear” when in tight, operable areas. Examples of these are:
- Lower jamb/interior stop locations (sides) of a DH/SH sash where, upon tilt-out, lower compression seal binding/tearing can occur.
- Casement applications where binding upon closure at the hinged location may take place.
Specifications
Available Configurations
All standard and custom shapes are available in a variety of colors, including white, black, tan or brown. The rigid or base portion of the seal can be manufactured with talc-filled materials to reduce stretching during insertion or expansion and contraction in demanding applications. Product is also heat-weldable and fully recyclable.
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