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Kiilto Airblock Fiber

A one-component, fibre reinforced, water-based, solvent-free and paste sealing agent. Can be applied with a brush or roller on vertical, horizontal and ceiling surfaces.

Special features

  • a very elastic coating against air leakages
  • paste
  • paintable
  • for sealing penetrations, window and door junctions, floor and wall junctions as well as wall and ceiling junctures. For interior use.


A filling, very elastic, water-based, paste coating against air leakages. Easy to apply. Can also be used as a barrier against radon. Excellent adhesion on different types of substrates. Suitable for vertical, horizontal and ceiling surfaces, junctures and joints as well as penetrations. Suitable for unheated interior areas.


Approx. 1kg/m²

Package Size

EAN Code

10 kg/8,1 l 6411512708102
Package Size 10 kg/8,1 l
EAN Code 6411512708102


SBR hybrid


A fibre reinforced paste

Density/specific weight



approx. 9



Bond strength

Different substrates Concrete: 2.1 MPa
Coarse floor levelling compound: 1.3 MPa (Kiilto 70)
Smooth levelling compound: 1.6 MPa (Kiilto TopPlan)
Wall plaster: 2.7 MPa (Kiilto CR DF)
Brick: 1.8 MPa
Chipboard: 1.5 MPa
Stainless steel (metal): 2.1 MPa
Aluminium: 1.9 MPa
Kiilto Block: 2.8 MPa
Kiilto Hydrablock: 2.7 MPa
Sandlime brick, chipboard and gypsum boards: The adhesion exceeded the substrate strength

Water vapour permeability

Sd = 18 m
Vapour permeability (EN ISO 12572:2001 condition A)


Approx. 65,000 mPas

Classifications and certificates


Application temperature

+15–25 °C

Package sizes

10 kg / 8.1 L

Frost resistance


Temperature resistance when dry

-20…+70 °C


Approx. 1kg/m²

Crack bridging ability

3.8 mm (EN 1062-7 (mod))

Layer thickness

approx. 0.4 mm


Can be stored above + 1 °C, in a tightly sealed original container max. 1 year.

Instructions for use

Stir the product before use. Remove all impurities that might impair adhesion, including loose particles, dust, dirt and salt deposit. Fill in dents and holes. Apply two even coats of Airblock Fiber. The second coat can be applied right after the first one (wet on wet). Drying time depends on prevailing conditions and coat thickness.

Kiilto Airblock Fiber can be used with Kiilto Butyylinauha tape or Kiilto KeraSafe Saumanauha sealing tape, if needed.

Tools: a brush or roller.

When uncoated, the product’s resistance to mechanical wear and UV light is limited. The need for levelling and coating of the product must be assessed on a case-by-case basis.

Environment and safety

Avoid unnecessary skin contact and exposure with the fresh product, use safety gloves. Refer to the material safety data sheet. For more information about the product and package disposal, visit

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