Fire Retardant PU-Foam NBS: B1 Fire Foam for Professional Installers

When a joint or penetration has to meet stricter fire requirements, a standard B3 foam is not an option. Fire retardant PU-Foam NBS is a ready-to-use, one-component fire retardant foam classified B1 according to DIN 4102. It fills, seals and insulates joints, seams and cavities, and adheres to concrete, masonry, wood and metal. Because the foam shows no shrinkage after curing, it keeps the joint closed against airflow.

• Fire class B1 according to DIN 4102
• No shrinkage after curing
• Thermal conductivity of 0.035–0.041 W/(m·K)
• Tensile strength 120 kPa, adhesion strength 100 kPa
• Tack-free in 7–8 minutes, cuttable after 40–60 minutes

A Gun-Grade B1 PU Foam for Frames, Joints and Penetrations

As a gun grade foam, Fire retardant PU-Foam NBS is dosed precisely with a PU foam gun into frame joints, window sills, cavities, pipe penetrations and electrical installations. It delivers approx. 40 litres of foam per can and withstands -50 °C to +78 °C once cured. Please note that the B1 classification describes the fire behaviour of the foam itself under test conditions; it does not by itself indicate a fire-resistance duration for a complete joint or penetration construction. For fire-rated applications, check the applicable classification report. Cured foam must be protected against UV outdoors.

Looking for a Private Label Producer for Fire Retardant Foam?

With fire-retardant products, the producer behind your brand matters. We specialise in private label and manufacture this B1 PU foam under your name with a guaranteed constant quality. White is standard; other foam colours are available on request, so your fire foam is recognisable on site at a glance. We support you with:

• Design support for cans, labels and packaging in line with your brand guidelines
• Provision of UFI numbers and compliant product labels
• Flexibility in outer packaging: labels on boxes or pre-printed boxes
• Smaller quantities possible, so you can start without large stock
• Fast delivery and a personal contact for full support