Acrylic firestop sealant ALFA SEALANT

  • Seals flexible and rigid structures
  • Ideal for linear connections and gaps







Acrylic mastic ALFA SEALANT is used for sealing gaps in flexible and rigid wall structures as well as gaps and joints between rigid floor structures. It can also seal linear joints and gaps for specific support structures and substrates. Intumescent ALFA SEALANT expands under high temperature, creating a tight protective barrier. The maximum permissible width of the joint/gap is 100 mm. Movement ability of the ALFA SEALANT system is ≤ 7.5%.

Application ALFA SEALANT is intended to seal:

  • gaps in flexible and rigid wall structures
  • gaps in rigid floor structures
  • joints between the rigid floor structures
  1. Clean the surfaces thoroughly from grease and other contaminants before applying ALFA SEALANT mastic. The mastic should not be used on substrates that exude oils, softeners or solvents, grease and other contaminants.
  2. ALFA SEALANT is a water-based product. In situations where there is a risk of corrosion, some metal parts must be properly secured before they are installed.
  3. When you apply ALFA SEALANT on plasterboards, the edges may be moistened, or you can dilute ALFA SEALANT with water to prime surfaces.
  4. When you use ALFA SEALANT in empty floor slabs, smooth the fire seal, defined as unilateral, on the headliner’s side. Make sure that the concrete thickness below the void is sufficient to ensure appropriate thickness of the mortar, following the installation instructions. Otherwise, cylindrical voids should be filled with stone wool usually of the same thickness as the floor slabs. Possibly, an optional seal should be installed on both the roof and the headliner.
  5. Make sure that the sealed gap is wide enough to contain the required backing material. In practice, this may not be less than 10mm.
  6. When installing trim the material so that it fit tight into the gap and be pushed to the proper depth.
  7. Fill the gap with ALFA SEALANT to the required depth.
  8. Finish with a spatula, brush or knife.
  9. ALFA SEALANT can be painted with majority of emulsion paints.
  10. When sealing plasterboard shaft walls, seal only from the side that is exposed to fire.


Penetration/joint type and max. dimensions

Instalation,  min. seal depth and backing material

Flexible walls ≤100 mm

Steel studs lined on both faces with minimum 2 layers of 12.5 mm thick boards

Rigid walls
≤ 150 mm

Concrete with a minimum density of 650 kg/m3

Rigid floors
≤ 150 mm

Concrete with a minimum density of 650 kg/m3






Linear gap seal in flexible or rigid wall constructions ≥100mm

Plasterboard  /concrete

Min. 9 mm

Mineral wool 20 mm, density 40kg/m3

EI 90–V–X–F–W30

Min. 20 mm

PE Rod

EI 120–T–X–F–W30

Linear gap seal in flexible or rigid wall constructions ≥130mm

Plasterboard  /concrete

Min. 15

Mineral wool Knauf Rocksilk 33, 15mm

EI 120–V–X–F–W30

Min. 30

Cardboard sheet

Min 15

EI 120-V-X-F-W30EI 90-V-X-F-W30

Min 30

PE Rod

Seal in rigid floor constructions ≥150mm


Min. 25

Mineral wool 25 mm, 40kg/m3

EI 120-H-X-F-W100








Type Color
kartusz 310ml white

Under development.


Europejska Aprobata Techniczna ETA 14/0190 Certyfikat zgodności 0843-CPR-0181 Badania ogniowe zgodnie z normą EN 13501