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Boss Products 333 Triple Expanding Foam Sealant

BOS 333
November 2023 Special - $7.99 ea. - While Supplies Last
  • Packaging: EA
  • BOSS – 333 is a ready-to-use, multi-purpose, polyurethane foam that expands to three times its original volume on contact with air. The expanding action fills holes, cracks and gaps more completely than standard caulks. BOSS® 333 has excellent insulating properties and superb adhesion to virtually all building materials. Meets CA-25-4 and is UL tested to meet ASTME-72.


    • Ready to use 12-oz Straw Can
    • Easy-to-use, multi-purpose urethane foam
    • Triple Expanding, it expands three times its original volume!
    • Adheres to all building materials except Teflon, silicone and polyethylene
    • Weatherproofs against wind and moisture
    • Seals by expanding into gaps, cracks and crevices
    • Uses include insulating, sealing and filling gaps around pipes, plumbing fixtures, ductwork and foundations
    • UL Classified Tested to ASTM E-84
    • Complies with EPA Method 24 and California Air Resource Board Method 310

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