£113.56 - £208.96 ex. VAT£113.56 - £208.96 ex. VATFJ203 is a fire-stopping backer rod made of rock wool sheathed with flexible glass wires. Benefits 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 Other backing foams are available here, we supply flat backer foam and backer rod. For more information on Nullifire, please visit their website by clicking here.