Payments Secured by WorldPay
  Return to main site  |   Home  |   About Us  |   Search  |   View Cart   |  Enquiry Form  

  Home > Fire Stop Products > Expansion Joint Seals

Intumescent Expansion Joint Seals - 4Hr Rated
Intumescent Expansion Joint Seals - 4Hr Rated

Intumescent Expansion Joint Seals - 4Hr Rated

Fire Rated Expansion Joint Seal / Linear Joint Seal

Available up to 150mm gap size.

Joint movement capability of +/- 50%.

Fire resistance testing to EN 1366-4 E 120, EI120 and BS 476 240mins.

IET (IEE) 17th Edition Fire Stop Compliant to Regulation 527.1-3 - Electrical Installations.

BS 7671-2008 Chapter 42 & 52 - Electrical Installations Fire Resistance.

Acoustic Isolation to EN 10140 to 22dB.

Air Permeabiltiy testing to EN 1026 to 600Pa - 100Pa 3.3/1.7 m3/h/m2 with FLEXI COAT.

Highly flexible and water resistant.


Designed for long linear joint installations in both horizontal and vertical applications it is a flexible and water resistant seal that expands when exposed to heat. The carbonaceous char formed by the graphite prevents the spread of fire through the joint thus ensuring the integrity of the compartment wall/floor is maintained.

Tested in block wall, concrete and masonry. Tested in concrete floors. Tested in linear joints up to 150mm wide.

Tested with cables, cable bunches, cable trays and cable trunking.

Joint movement capability of +/- 50%.

Areas Of Use

Between steelwork and blockwork where deflection and movement could occur

  • In movement joints with blockwork walls and floors.

  • Top of wallhead to the underside of the floor - although gaps could be uneven ASTROflame Intumescent Expansion Joint Seal is extremely compressible and should accommodate any irregularities.

  • Expansion Joint is an extremely versatile filler material.


Sold in One Metre lengths in a range of widths and depths to seal different gap dimensions.


Sold in One Metre lengths in a range of widths and depths to seal different gap dimensions.

Gap Width

Dimension of Seal


Product Ref

up to 10mm




11mm to 20mm




21mm to 25mm




26mm to 35mm




36mm to 50mm




51mm to 75mm




76mm to 100mm




101mm to 125mm




126mm to 150mm






Sold individually.

Fire Test or Assessment Report

Certifire Approved

Health and Safety

The product does not present any known health hazards during or after installation. Normal good industrial and personal hygiene practises should be observed.


Installation is easily effected by compressing the pre cut ASTROflame Intumescent Expansion Joint Seal and inserting into the joint and releasing. A minimum compression of 15% per thickness of material is recommended to ensure a rigid friction fit.

Ordering Example:

To specify for a gap width of  20mm order Gap Width Dimension 11mm to 20mm. In the shopping basket set the number of one metre lengths you require. Supplied by the metre.

Gap Width Size

Our Price: £4.24

Prices include VAT.

Related Products
Fire Resistant Batt & Coating - CE MarkedFire Resistant Batt & Coating - CE Marked
ASTRO BATT Fire Resistant Board for sealing service penetrations | CE Marked | Tested to EN 1366-3 EI 60 E 90, BS 476 - 240mins | Certifire Approval.
Fire Resistant MortarFire Resistant Mortar
Gypsum based fire resistant mortar | BS476: Part 20 | EN1366-3 | Up to 6 hours fire resistance | For floors & walls
Flexible Fire Board & CoatingFlexible Fire Board & Coating
Highly Flexible Fire Rated Board | Used where penetrating services are subject to high movement | Allows up to 50% deflection
Fire Stop BlockFire Stop Block
A compressible firestop seal for service penetration openings or trunking. An alternative to intumescent pillows.
Cavity Fire BarrierCavity Fire Barrier
Tested to BS 476 Part 20 | 30 Minutes Fire Rating | For cavities up to a nominal 50mm |For masonry cavities
Cladding Seal - up to 125mm cavity.Cladding Seal - up to 125mm cavity.
Rated 30 minutes. For fitting to larger cavities behind exterior cladding to enhance fire protection.
Intumescent Expansion Joint Seals - 2Hr RatedIntumescent Expansion Joint Seals - 2Hr Rated
BS476: Part 20 | Up to 2 hours fire resistance | Certifire Approved | Suitable for cable trunking

« Back

  Contact us on 01329 841 416 for all enquiries Site Map  |  Terms & Conditions