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A five-hour rated, one-part, emulsion acrylic based intumescent sealant for use in joints in a variety of fire rated structures.

Features and benefits:

  • Provides a firm yet flexible seal.
  • Swells to over three times its original size when exposed to heat, creating a char that will resist the passage of fire for up to five hours.
  • No priming required for most common substrates.
  • Joint movement capability of ±12.5%.
  • For use in joints up to 50 mm wide.
  • Halogen free.
  • Non-slump.
  • Tack free in 15 minutes.
  • Over-paintable.
  • Suitable for use as an acoustic sealant - average noise reduction of 29 dB.


  • Sealing joints, voids and irregular holes in fire walls, partitions and other structures; also for maintaining the integrity of pipes and cables that penetrate them.
  • For internal perimeter pointing of fire rated door and window frames.


  • Tested in accordance with BS EN 1366-4:2006 as detailed in Warrington Fire Research Report No. 181967 (May 2009).
  • Acoustic rated to BS EN ISO 140/3:2005.
  • Tested for air permeability to EN13141-1, Ventilation for buildings. Performance testing of components/ products for residential ventilation.
  • CE marked under ETAG 026 Part 3 European Technical Assessment 13/1058.
  • Tested in accordance with BS EN 1366-3:2009 as detailed in Warrington Fire Research Report No. 349127 (Feb 2015).

Standard product features

Technical characteristics:

  • Maximum joint width: 50 mm.
  • Joint movement capability: ±12.5%.
  • Skinning time: 10 minutes.
  • Tack-free time: 15 minutes.
  • Curing rate (at 50% RH, 23°C): 1.0 mm/ 24 h.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-55-75/320 Acrylic construction joint sealants
45-55-75/368 Intumescent firestop sealant

Product specification

An important note about specifying



Sika Limited


+44 (0)1707 394444

Product reference

Fire Sealant 300



Manufacturer details

Welwyn Garden City,
Hertfordshire, AL7 1BQ
Tel +44 (0)1707 394444
Fax +44 (0)1707 329129
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