Boss 334 Window and Door Minimal Expanding Gun Foam, 20 oz.

Cat # : Y8699 | Model/Part #: 33420

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BOSS® 334 Window & Door Minimal Expanding Gun Foam is a ready to use polyurethane foam, formulated to seal gaps around windows and door frames and rough openings. BOSS® 334 expands to generate an effective seal, and when used properly is proven not to distort or bow window and door frames.


  • Installing of window and door frames
  • Filling of cavities
  • Sealing of all openings in roof constructions
  • Creation of a soundproof screen
  • Mounting and sealing of window and door frames
  • Connecting of insulation materials and roof constructions
  • Application of a soundproofing layer on motors
  • Improving thermical isolation in cooling systems


  • AAMA 812-04 approved
  • CFC propellant free
  • Excellent adhesion on most substrates (except Teflon, PE and PP)
  • High thermal and acoustical insulation
  • Very good filling capacities
  • Excellent mounting capacities
  • Excellent stability (no shrink or post expansion)
  • Very precise application due to the foam gun system
  • Low pressure build, reducing the chance of bowing
  • VOC Compliant


Brand Boss
Catalog Number Y8699
Model/Part Number 33420
Minimum Order Quantity 0.0
Base Unit of Measure Unit(S)
Capacity 20 oz
Gross Weight 2 LB
Length 2.5 IN

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