One-component polyurethane (PU) foam is a moisture-curing foam that fills, insulates and seals gaps in construction. Soudal is one of the world’s largest PU foam makers, producing over 60 million cans a year.

Foam is not a joint sealant. Around a window or door frame it fills and insulates the joint, and a sealant, tape or trim covers it on the exposed faces.

Where it’s used

Filling gaps around window and door frames
Filling service penetrations
Thermal and acoustic insulation in joints and cavities
Mounting and bonding, with foams made for that job

Good perimeter foam matters. A double-glazed window loses much of its benefit if the joint around it is packed with rock wool or cement, which leaves a cold or heat bridge.

Choosing a foam

Look at how it’s dispensed (straw or gun), expansion, yield, curing conditions and the substrates it will touch. Fire-rated foams carry their rating only in the tested joint configuration.

Application and safety

Protect adjacent finishes, keep the area ventilated and wear gloves and eye protection. Gun-grade foams need a foam gun and gun cleaner.

Browse polyurethane foams or contact PFE Technologies for data sheets.