The Tremco ExoAir® LEF – Low Expansion Foam is a high-performance polyurethane foam sealant engineered for precision air sealing in window, door, and retrofit applications.
Can: 750 ml
Only expands approximately 7%, making it perfect for windows and doors where controlled expansion is critical to prevent frame distortion. Tremco ExoAir LEF is a versatile, one-component, UL classified polyurethane foam available in straw grade or gun grade aerosol cans. This low-pressure product helps reduce air infiltration and prevent heat loss in a wide range of residential and commercial applications.
Basic Uses
Apply Tremco ExoAir Low Expansion Foam to any clean surface to fill, insulate, and seal around:
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Windows and door frame joints
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Beneath base plates and mud sills
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T-joints and top plate penetrations
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Corner joints and exterior cracks
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Utility panels, pipes, and duct penetrations
It is specifically designed to be dispensed as a controlled bead to fill cracks, crevices, and smaller cavities on flat or irregular surfaces.
Features
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Ergonomically designed straw grade cap for easy, accurate application
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One-component foam with (H)CFC-free propellant
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Low pressure build and high yield
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Low air infiltration and low water absorption
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Quick tack-free time
Packaging / Color
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750 ml gun grade cans
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12 cans per case
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Color: Light Green
Surface Preparation
Surfaces should be dry and free from dust, debris, grease, and mold release agents. Protect adjacent areas not intended for foaming. Cleanup with acetone is possible before the foam fully cures.
No returns on consumable supplies.
