Fire Rated Expanding Foam – 2hr – Gun Grade B2

Gun grade fire rated expanding foam is one of those products that earns its place on site pretty quickly. Wherever services pass through a fire-rated wall or floor, you need a seal that actually meets the spec, not just something that looks the part. This foam carries a 2-hour fire rating and B2 flame retardancy classification, making it suitable for use in fire-rated partition systems, around pipe penetrations, cable runs, ductwork, and service voids where passive fire protection is a requirement.

The polyurethane formula is quick setting and expands significantly on application, filling irregular gaps and voids with far less material than you might expect. It yields up to 50 times its original volume, which sounds dramatic until you realise it actually makes good sense of the price per can. A single 750ml canister goes a long way, particularly on smaller penetrations where precise application counts more than volume.

Where Gun Grade Fire Rated Expanding Foam Gets Used

The gun grade format is the key difference here. You get proper control over the bead, a consistent flow rate, and far less waste compared to a straw can. If you’re doing more than a handful of penetrations in a day, the gun applicator pays for itself in material saved alone. The foam adheres well to concrete, masonry, timber, metal, and most common building substrates, so it handles mixed-material penetrations without fuss.

Fire Rated Performance on Site

The 2-hour fire resistance rating means this product is specified for use where a compartmentation strategy demands that a penetration seal can hold back fire and hot gases for at least two hours. That’s a meaningful standard in most commercial and multi-occupancy residential builds. It also meets the B2 classification under European reaction-to-fire standards, confirming it won’t contribute meaningfully to the spread of flame under normal conditions.

Supplied individually or in a box of 12, it’s a sensible bulk buy for any contractor regularly working on fire-stopped services. Grab the gun, fill the gap, tick the compliance box, and move on.