K-FLEX K-FIRE SEALANT A is a one part, acrylic emulsion that intumesces and forms a char when exposed to the heat of a fire, preventing the passage of fire and smoke In normal use, it will maintain the sound reduction index of a structure. It does not emit halogenated by-products under fire conditions, and does not contain any hazardous raw material. It has good, unprimed, adhesion to a wide variety of common building substrates, and it is designed to work in combination with K-FLEX K-FIRE BATT to prevent the passage of fire and smoke between compartimentations whilst still allowing the installation of services.

- Construction joints in fire partitioning walls and floors;
- Acoustic seals around perimeters of fire resistant partitions.

CE Marked 1121-CPR-JA5095 
ETA 15-0777
ETAG 026-2 (2011) according EN 1366-3 Penetration Seals
ETA 15-0776
ETAG 026-3 (2011) according EN 1366-4 Linear Joint and Gap Seals





K-FLEX K-FIRE SEALANT A - 310 ml cartridge, white 25
K-FLEX K-FIRE SEALANT A - 310 ml cartridge, grey 25
K-FLEX K-FIRE SEALANT A - 5 kg tube, white  -



Test method

Fire Rating

Up to EI 240 

EN 1366-3
EN 1366-4

Tested Penetration Seal In

Flexible walls: min. thickness 120 mm
Rigid walls: min. thickness of 150 mm.

Tested Service Penetration

- Copper pipes up to Ø159mm
- Steel pipes up to Ø159mm
- Cables up to 50mm
- Perforated cable tray up to 450x50mm
- Linear Joint up to W50 + backing material

Durability And Serviceability

Type Z1: Intended for use at internal conditions, excluding temperature below 0°C, without exposure to rain or UV.

EOTA TR 024:2009

Application Temp.

+5°C to +40°C  
Storing Temp. +5°C to +30°C  


1.57 g/ml  


5mm after 1hr in 30mm joint  



Cure rate

3mm per day at 50% relative humidity 23°C  

Tack Free

30 mins at 23°C, 50% RH  

Water resistance

Good when fully cured  

U.V. Resistance


Joint movement

Remains flexible  

Shelf life

18 months  

Acoustic performances

Rw up to 65 dB
Rw up to 40 dB

EN 10140
EN ISO 717-1

Ecological data

Low Ozone Depletion Potential (ODP)
Low Global Warming Potential (GWP)
Dust Free

L’ISOLANTE K-FLEX reserves the right to change data and technical requirements without notice.
Contact us for more information.





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