Sika Boom® AS All-Season Low Expansion Polyurethane Foam – Door & Window Insulation

Sika Boom® AS is a one-component, low-expansion, CFC-free polyurethane foam designed for year-round use. It is ideal for insulating around window and door frames, filling gaps and cavities, sealing against drafts, dust and noise, and providing air sealing and insulation.

The all-season formulation can be applied in temperatures ranging from -12°C to 30°C. The convenient dispensing straw means no special application tools are required.

With a high-yield formulation of up to 45 L, Sika Boom® AS provides an efficient solution for sealing and insulating gaps around doors, windows and other building penetrations.

• One-component polyurethane foam
• Low-expansion formulation
• All-season application
• Application temperature: -12°C to 30°C
• High yield of up to 45 L
• Convenient dispensing straw included
• No special tools required
• Helps seal against drafts, dust and noise
• Suitable for filling gaps, voids, cavities and cracks
• Helps provide air sealing and insulation
• CFC-free and HCFC-free
• Low VOC: less than 2 g/L
• UL 723 Classified (ASTM E84)
• CAN/ULC-S102-10 classified
• Light yellow colour

Sika Boom® AS is suitable for:

• Installing and insulating window frames
• Installing and insulating door frames
• Filling gaps and voids
• Sealing wall penetrations
• Air sealing
• Insulating around doors and windows
• Sealing against drafts
• Sealing against dust and noise
• Filling cavities, cracks and joints

• Product: Sika Boom® AS
• Product Type: Low-Expansion Polyurethane Foam
• Formulation: One-component
• Colour: Light Yellow
• Application Temperature: -12°C to 30°C
• Density: 22 ± 3 kg/m³
• Tack-Free Time: Approximately 7 ± 3 minutes
• Cutting Time: Approximately 30–45 minutes
• Cure Time: 24 hours
• Water Absorption: 1% by volume
• R-Value: Approximately R-4.7 per inch
• Thermal Conductivity: 0.036 W/m·K at 20°C
• VOC: Less than 2 g/L
• Shelf Life: 15 months from production date when properly stored
• Storage Temperature: 5°C to 30°C
• Application Method: Dispensing straw