FISCHER Rýchlopeniaci PU S 750 B2 Profi (béžová, 750ml)

On a busy construction site, a window installer reaches for a can of Fischer PU S 750 B2 Profi foam to seal the gap between the frame and the masonry. The beige foam flows smoothly from the adapter, expanding to fill every void, and within minutes a skin forms. By the next day, the joint is fully loadable, providing a durable, insulating, and sound-reducing seal that meets fire class B2 requirements. This professional-grade assembly foam is trusted by tradespeople for its reliable curing, excellent yield, and consistent performance in demanding conditions.

Key specifications

• Volume: 750 ml can, yielding up to 45 liters of cured foam
• Colour: Beige
• Fire class: B2 according to DIN 4102-1
• Application: Adapter (straw) for precise dispensing
• Base material: Polyurethane (PU), moisture-curing
• Skin formation: approx. 8–12 minutes
• Cuttable after: approx. 30–40 minutes
• Fully loadable after: approx. 24 hours
• Application temperature (can): +5°C to +30°C
• Application temperature (substrate): -5°C to +35°C
• Temperature resistance (cured): -40°C to +90°C
• Thermal conductivity: approx. 0.035 W/(m·K)
• Sound reduction index: up to 60 dB
• Water resistant: yes (closed-cell structure)
• UV resistance: limited (requires protection)
• Density (cured foam): approx. 15–25 kg/m³
• Shelf life: 18 months unopened, stored correctly

Why choose it

The Fischer PU S 750 B2 Profi foam combines high yield with reliable performance. Its beige colour blends unobtrusively with common building materials, and the B2 fire rating ensures compliance with many building regulations. The closed-cell structure provides excellent thermal insulation and water resistance, making it suitable for both interior and exterior applications when protected from UV exposure. The adapter allows for easy application without the need for a separate foam gun, making it a convenient choice for both professionals and DIY enthusiasts.

Ideal use cases

• Sealing and insulating window and door frames
• Filling gaps and joints in masonry, concrete, and wood
• Soundproofing around pipes and electrical conduits
• Bonding insulation panels in construction
• General gap-filling in building projects

Good to know

For best results, shake the can vigorously before use and moisten surfaces slightly to accelerate curing. The foam should be protected from direct sunlight or covered with paint or sealant to prevent UV degradation. Store the can upright in a cool, dry place, and use within 18 months of manufacture. Always follow safety instructions on the label, including using in well-ventilated areas and wearing protective gloves.