Stopaq® Mortar FR is an inorganic, non-shrinking, flame retardant, non -degradable, asbestos-free mortar. It is used as mechanical support and barrier for pipe- or cable wall penetrations filled with Stopaq® 2100 Aquastop, Stopaq® 4100 Putty or Stopaq® Paste CZ/CZH/CZHT in fire rated walls and floors. It has a low thermal conductivity and has flame retarding properties. The mortar bonds to concrete, brick, metals and plastics.