BOSS® 338 Flexible Gun Foam - 24 oz
- Brand Name: Boss®
- Sku Number: 481004
- Unit of Measure: CN
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Product Description
BOSS® 338 is a premium, easy-to-use polyurethane foam designed for homeowners, DIYers, and small contractors who need a reliable sealant that performs in tough conditions. It’s a one-component, moisture-curing foam that offers low expansion and high flexibility, making it ideal for projects where movement or shifting might occur—like around windows, doors, or wall joints.
Unlike standard foams, BOSS® 338 won’t crack or lose its seal over time. It moves with your structure, maintaining excellent thermal insulation and soundproofing for years. Plus, it’s environmentally friendly with CFC-free propellants that won’t harm the ozone layer.
With minimal expansion (less than 50%), you get better control, less waste, and a cleaner finish. Whether you're tackling a remodel, weatherproofing your home, or sealing up a new install, BOSS® 338 gets the job done—quickly, cleanly, and permanently.
| MPN: | 33824 |
| Application: | Window and Door |
- Very high elastic recovery
- Copes with extreme mechanical movement without cracking
- Excellent adhesion on most substrates (except Teflon, PE, and PP)
- High thermal and acoustical insulation performance
- Very good filling capabilities
- Excellent stability (no shrink or post expansion)
- Very precise application due to the foam applicator gun system.
- Low expansion
- Good compressibility
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