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B3 Expanding Foam Max

FM365 is a rapid curing, high yield, one component gun grade expanding polyurethane foam that is suitable for general gap filling, bonding and insulation applications.


FM365 is suitable for general gap filling, bonding and insulation applications. These include the perimeter sealing and fixing of windows and doors, sealing of non-fire rated service penetrations and sealing around insulation panels.

  • Ideal for filling, sealing and insulating of joints and gaps in a variety of building and construction applications
  • High yield application – joint only requires filling to 60%, prior to post-expansion
  • Rapid cure formulation – foam is tack free within 8 minutes, and can be cut or trimmed within 45 minutes
  • Forms a strong bond to concrete, brickwork, stone, plaster, wood, fibre concrete, metal, PVC and polystyrene

Usage Guidelines

  • Shake the canister vigorously at least 20 times. Remove the protective cap and screw the gun carefully onto the canister. 
  • Invert can and direct nozzle into gap, pressing gently on the trigger to establish the correct flow rate.
  • Joints should be underfilled to allow for post expansion of the foam. Fill to approximately 60% of joint depth for optimum results. 
  • For best results always work with the canister in a vertical position and keep the valve pointed downwards.
  • On horizontal surfaces, always work away from the exuded bead and on vertical applications, start at the bottom, working upwards.
  • On deep joints, apply in layers, waiting until each layer has skinned and partially cured before applying the next.
  • Applying a light misting of clean water before applying each layer before subsequent application will assist adhesion and cure speed.

Technical data

PropertyTest MethodResults
Composition Polyurethane foam
Fire ClassificationDIN 4102-1B3
YieldFEICA TM100340 litres
Water AbsorptionEN 16090.2 kg/m²
DensityLAB 01510  - 15 kg/m³
Tack Free TimeFEICA TM 10148 minutes
Cutting TimeFEICA TM 100545 minutes
Loading Time 24 hours
Compressive Strength (10%)FEICA TM 101121.7 kPa wet
  23.5 kPa dry
Elongation at BreakFEICA TM 101869% wet
  35% dry
Thermal ConductivityEN 1266736 mW/m.K
Application TemperatureCanister:+20°C
 Ambient:+5°C to +35°C
Service Temperature Short Term:  -40°C to +130°C 
  Long Term:  -40°C to +90°C
StorageStore in shaded dry conditions between +10°C and +25°C.  Store canisters upright. The product is contained in a pressurised container - observe storage instructions and do not apply heat.
Shelf Life18 months when stored as recommended in original unopened containers.

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