Intumescent Sealant

Intumescent foam

Intumescent Sealant

Premseal FR Acrylic is a halogen-free, polymer emulsion based sealant that swells when subjected to temperatures in excess of 125°C and forms a char coat that restricts the passage of smoke and fire.

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Typical Applications

Applications include:

  • Smoke and fire seal in joints up to 35mm deep without slumping
  • Sealing joints in and around internal partitions
  • Sealing lap joints in fire-rated cladding
  • Sealing between fire doors and fire-rated walls

Product Features

  • Excellent adhesion to a wide range of substrates
  • Will not harden or crack with age
  • Readily over-paintable


  • BS EN 1366-3: 2004 & BS EN 1366-4: 2006. Tested at Bodycote Warrington Fire, report no.
    173658A, achieving 4-hour integrity and insulation rating for a range of linear and
    penetration seals
  • An indicative fire test based on BS476: Part 20 – Warrington Fire Research achieved a 4-
    hour fire rating (integrity) for a range of vertical and horizontal joints up to 35mm wide
    between various non-combustible construction materials. A 1-hour fire rating (integrity)
    was achieved for a range of vertical joints up to 25mm wide between combustible timber


 Intumescent & Acoustic FR Acrylic Sealant
AdhesionExcellent to a wide variety of substrates
Movement± 15%
Hardness (Shore A)25–30
Skinning time15 min to 1 hour, depending on conditions
Cure time5 to 15 days, depending on joint size
Service temperature-20°C to +70°C
Application temperature+5°C to +40°C
Shelf life12 months

Please note: The above technical information is given as a guide and is based on test data obtained under laboratory conditions. Materials should be fully tested by the end user to establish suitability of the product for the intended application. June 2013


Data Sheet PDFHealth & Safety Sheet