FJ203 is a firestopping backer rod made of rock wool sheathed with flexible glass wires. It's used to make fire-resistant expansion joints between masonry elements, wall and slab, directly exposed to fire or not, in hospitals, hotels, car parks, schools, airports, nuclear power plants etc...

• Classification reports for fire resistance up to 4 hours according to NF EN 13501-2
• High regularity
• Fits all joints
• Packaged in long coils
• Good cohesion, easy to cut