Polyurethane Foam Sealant Koelner Piana RPP-45-K 750 ml — Gun-Applied, All-Season

Koelner Piana RPP-45-K 750 ml is a gun-applied, all-season polyurethane mounting foam designed for sealing, insulating and filling gaps and joints in building works. Supplied in a cartridge for use with a foam gun, this foam adheres to common construction substrates and is formulated to provide durable thermal and acoustic insulation as well as reliable adhesion during window and door installation and general sealing tasks.

Advantages

The product delivers controlled expansion and high yield when applied with a compatible foam gun, allowing for accurate dosing and reduced waste. It forms a resilient closed- and open-cell structure that improves thermal insulation and reduces sound transmission. The foam bonds to a wide range of substrates, including concrete, brick, wood and many plastics, and cures to a stable, sandable material. It is suitable for use across a wide temperature range, enabling year-round application when handled according to manufacturer recommendations.

Suitable for

• Sealing joints and gaps around windows and doors
• Thermal insulation of cavities and voids
• Acoustic sealing between structural elements
• Filling uneven surfaces and cavities before finishing
• General mounting and installation tasks requiring foam sealing

Key specifications

• Formulation: Polyurethane mounting foam, gun-applied cartridge
• Volume: 750 ml cartridge
• Application season: All-season (usable in a wide temperature range when applied properly)
• Compatibility: Bonds to concrete, brick, wood and many construction plastics
• Curing: Foam expands and cures to a resilient, sandable material
• Performance: Provides thermal and acoustic insulation and gap filling

How to use

Shake the cartridge thoroughly before use and attach it to a compatible foam gun. Apply to clean, dust-free and slightly damp surfaces for optimal adhesion and curing. Dispense foam in layers for deep cavities, allowing each layer to partially cure before adding more. After curing, excess foam can be trimmed with a knife and finished by sanding or covering with appropriate sealants or trim. Follow safety instructions for ventilation and protective equipment while dispensing and curing.

Usage recommendations

For consistent results, use a dedicated polyurethane foam gun and perform a small test application to adjust the gun flow. Store cartridges upright in a cool, dry place and avoid freezing temperatures. Allow cured foam to reach full strength before applying mechanical loads or finishing materials.