Maximise your building's integrity with high performance products manufactured in an ISO certified factory

FR ASF Mastic

iPASSIVE FR ASF is a one part intumescent sealant that is designed to prevent the spread of fire, smoke and hot gasses through openings in fire rated walls and floors. Specifically designed for linear joints and openings for building services penetrations.

Product Description

iPASSIVE FR ASF is acrylic based which results in a firm but flexible seal. In areas of high humidity and/or in joints with excessive movement use iPASSIVE FR IPT. In order to obtain maximum performance and the correct seal depth to width ratio, the use of backing material is strongly recommended.


  • Fire rated in both horizontal and vertical joints
  • No priming required for most construction substrates
  • Excellent adhesion to most common building substrates
  • Joint movement capability of 12.5%
  • For use in joints up to 100 mm wide
  • Fast cure – tack free within an hour
  • Halogen free
  • Paintable
  • 12 months shelf life
  • Excellent slump resistance
  • Reduces sound transmission in joints