Intumescent Fire Door Seal Strips and Sheet
Fire doors are one of the most important components in ensuring safe exit, isolation of the fire and saving lives. However a fire door assembly must be made of fire rated components must be used as per tested designs. Intumescent strips are the most important fire rated component in a fire doors. It helps stopping smoke and fire from spreading from the gaps in the edges of door shutter & frame joints, locks, handles, etc.
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Intumescent strip works by sealing around the edges of a fire door in the event of a fire. The edges of a door are one of the most vulnerable when fire strikes, so intumescent strip is extremely important. Two main types are available - Fire Only or Fire & Smoke. Fire & Smoke seal has a brush pile or rubber fins, and these also provide protection against smoke by creating a physical barrier between the fire door and the frame.
At Wedge, we specialise in supplying a comprehensive range of intumescent strips which are designed to make it quick and easy to increase the level of fire safety at your premises.
30 years of Guarantee
Zero Halogens Intumescent Material
From 20:1 to 60:1 Extreme Expansion
Application
Fire Doors Intumescent Strips Fire Rated Access Panel
Fire rated Composite Panels Intumescent Electrical Switch-box Fire Rated Air Transfer Grills
Fire Wrap for Pipe & Fire Collars Duct Fire Wrap
 
1. Rigid Intumescent Seal Strips
26:1 Free Expansion | Uni-directional expansion | Stable char structure
A rigid intumescent material with excellent pressure generation and expansion performance. It is suited to a wide range of applications including as a fire seal for door and glazing applications, ironmongery protection, cladding and rain-screen cavity fire barriers, construction joints and general gap sealing.
Made of halogen free graphite based intumescent material which produces a particularly stable and resilient insulating char structure during and after expansion.
Pressure generation expansion at 400°C is 16 Bar, Thickness (mm): 1.7 - 6.6
Types: Basic, Self-Adhesive, PVC Coated : B1, slowly combustible Reaction to fire
2. Flexible Intumescent Seal Strips
20:1 Free Expansion | Highly flexible | Excellent char structure
It is a dark grey intumescent sheet which generates high expansion and pressure generation when exposed to fire or heat. It is suitable for applications such as door and glazing seals, door hardware and ironmongery protection, damper seals, gap sealing or a variety of
gasket applications.
It is highly flexible allowing it to be wrapped or folded to suit various applications but produces an excellent char structure helping to maintain integrity throughout the fire. Pressure generation expansion at 400°C is 11 Bar.
 
FAQs – Intumescent Fire Door Seal Strips & Sheet
Q1. What are Wedge Intumescent Fire Door Seal Strips & Sheets?
Wedge Intumescent Fire Door Seal Strips & Sheets are passive fire protection products designed to expand when exposed to heat, sealing gaps in fire-rated doors, windows, glazing systems, service penetrations, and expansion joints. They help block fire, smoke, and hot gases for up to 30–240 minutes, depending on the specification.
Q2. What is the difference between INTUR (Rigid) and INTUF (Flexible) Intumescent Fire Seals?
INTUR – Rigid Seals: PVC-encapsulated graphite seals for heavy-duty applications where regular maintenance is difficult. Available in fire-only, fire & smoke, fire & acoustic, and fire & weather-proof versions.
INTUF – Flexible Seals: Rubber-free, zero-halogen graphite seals that can bend around curves and irregular gaps, ideal for doors, windows, and structural joints.
Q3. Which grades of Wedge Intumescent Fire Seals are available?
INTUR-10, INTUR-14, INTUR-20, INTUR-P (Rigid)
INTUF-10, INTUF-14, INTUF-20 (Flexible)
All grades come in multiple widths and thicknesses, from 10×2 mm to 40×2 mm strips and sheet sizes up to 1120×2 mm.
Q4. How do Wedge Intumescent Fire Seals work?
When exposed to around 200 °C, the graphite intumescent material expands up to 20–60× its original volume, sealing gaps and creating a heat-resistant char barrier to stop fire and smoke spread.
Q5. Where can these fire seals be used?
Fire-rated wooden and steel doors
Fire-rated windows and glazing partitions
Around service penetrations for pipes, cables, and ducts
Expansion and structural joints in walls and floors
Railway and industrial applications requiring BS EN 45545 compliance
Q6. What are the main benefits of Wedge Intumescent Fire Seals?
Fire resistance: 30 to 240 minutes
Zero halogen, rubber-free: Smoke-free performance
High expansion ratio: Excellent gap-sealing capability
Durability: Resistant to moisture, mechanical wear, and aging
Custom colours available for rigid PVC-cased models
Long service life: INTUF20 grade up to 50 years
Q7. Can Wedge Intumescent Fire Seals also block smoke and noise?
Yes. Selected INTUR and INTUF variants provide fire + smoke sealing, while some models offer fire + smoke + acoustic or fire + smoke + weather protection.
Q8. Are these seals code-compliant?
Yes. Wedge Intumescent Fire Seals are designed to meet international fire safety standards and can be specified to comply with building codes and BS EN standards for fire-rated assemblies.
Q9. How are they installed?
Seals are typically supplied with self-adhesive backing for easy installation—just clean the surface, cut to size, remove the backing, and press firmly. For non-adhesive types, mechanical fixing or frame slotting may be used.
Q10. Can I order custom sizes or bulk quantities?
Yes. Wedge India manufactures standard and custom dimensions for OEM and project needs, with both high-MOQ bulk pricing and low-MOQ special orders available.