Nullifire FJ203 Fire Resistant Sealing Cord consists of rock wool that is covered with flexible glass fibers.

Nullifire FJ203 Fire-resistant Sealing Cord is used as a fire-resistant joint seal / backing to seal movement joints between different parts of masonry, between (load-bearing) walls and floor slabs, whether or not directly in contact with the fire, in all kinds of buildings .


  • Can be used in irregular joints
  • Available on rolls of great length
  • Easy to cut