Kiilto Block

An odour and solvent-free, tight barrier for encapsulating hazardous compounds released from building materials into the indoor air. The Kiilto Block Barrier’s mesh structure makes it tough and elastic, and means that it can be used on different types of substrates.

Special features

  • elastic, dense and tough
  • no odour or solvents
  • for blocking VOC and PAH compounds and ammonia
  • excellent spreading and adhesion on different types of substrates
  • option to use as it is and leave uncoated/untreated in areas that are protected from sunlight




Kiilto Block is a two-component barrier that forms a dense mesh that encapsulates hazardous components released into the indoor air from building materials.

Package Size EAN Code
13 l/10 kg 6411513443101
Air humidity

max. 70 % RH

Application temperature

15-30 °C

Classifications and certificates



Light grey


1.4 kg / m² = approx. 1 mm layer

Curing rate

Light traffic after 12 h
Final strength after 7 d

Density/specific weight

Mix: approx. 1.4 kg/l

Elongation at break

approx. 35% (DIN 53504)


Shore D 60

Layer thickness

2 mm layer of Kiilto Block Barrier

Mixing ratio

100 weight parts of Kiilto Block
30 weight parts of Kiilto Block hardener

Package sizes

Kiilto Block 10 kg
Kiilto Block hardener 3kg


In unopened containers, above +1 °C, for 12 months.

Substrate humidity

Choose the primer according to the substrate moisture content.

Tensile strength

approx. 12/mm² (DIN 53504)


Kiilto Block approx. 5 000 mpas
Kiilto Block hardener approx. 200 mPas

Working time

approx. 20-30 min

Instructions for use

Suitable substrates: Smooth and clean concrete or another similar solid levelling screed substrate, such as Kiilto Fiberflex DF

For substrates that will be coated with a flooring or tiles:
Remove any loose particles carefully. If the substrate moisture content is < 90 RH%, apply a thin layer of Kiilto Block, with a consumption of approximately 300 g/m². For substrates with a higher moisture content, apply a layer of Kiilto Hydrablock, with a consumption of 300 g/m². Substrates that will be left uncoated after Kiilto Block treatment: Carefully remove any loose particles. If the substrate moisture content is < 90 RH%, apply a thin layer of Kiilto Hydrablock, with a consumption of approximately 300 g/m². For substrates with a higher moisture content, apply two layers of Kiilto Hydrablock, with a consumption of 600 g/m² . The relative humidity of the area must not exceed 70% RH, and the temperature must be between +15 °C and +30 °C. Stir Kiilto Block well before use. Add Kiilto Block Hardener using the correct mixing ratio. Empty 3 kg of Kiilto Block Hardener into the Kiilto Block Barrier and mix. Mix well by keeping the drill mixer below the surface at all times to avoid air bubbles. Pour the mix into another container. Mix again until it is smooth with no lumps or unmixed components. Pour the mix onto the floor and even out with a steel or notched trowel for a layer that is 1 mm thick. Roll the entire area with a short-haired paint or spike roller to remove air bubbles. Let dry for 12–72 h. Apply the second layer in the same manner as the first. Total consumption: approximately 2.8 kg/m². NOTE! If Kiilto Block is used already as a primer, the total consumption of Kiilto Block on top of the primer layer is 2.5 kg/m². Coving: Add 1.5–2.5 % Sylothix 51 thickening fiber into Kiilto Block barrier when making coves. Ensure that the barrier does not come into contact with water in the first 24 hours. The temperature and humidity of materials and of the air affect the hardening process. Clean tools with acetone or Kestopur Cleaner 303. NOTE. If exposed to UV radiation, uncoated Kiilto Block Barrier will turn yellow.

Additional information

The information given in this product data sheet is based on our tests and our practical knowledge. The technical data is defined under standard conditions. Variations in local working conditions and methods will affect the product performance and result. The result is also strongly affected by working methods. We guarantee the high quality of our products according to our Quality Management System. No liability can be accepted from incorrect use of the product or prevailing conditions, over which we have no control. Therefore, we cannot be held responsible for the final result. The user of the product must test product’s suitability to the intended application.

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

M1 emission classification for building material
CE marking
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