„Rexpandit“ is a joint element that foams up in the event of fire for the fire
protection sealing of structural joints in walls or ceilings.
„Rexpandit 20/40“ and „Rexpandit 30/50“ consist of a compressible foam strip
that is covered on the right and left with two layers of „Flaton-flex EN“, a building
material that foams up in the event of fire.
„Rexpandit“ is elastic and compressible. The element is clamped into the joint
during installation. The joint is immediately smoke-tight and sound-insulated.
In the event of fire, the outer layers of „Flaton-flex EN“ expand.
The joints are filled by the material that forms. The foam strip is replaced by
the intumescenting material. This creates an effective barrier that prevents the
passage of fire, heat and smoke for at least 90 minutes.
- “Rexpandit” is classified in building material class C-s1, dO according to DIN EN 13501-1:2019-05.
- “Rexpandit” is sound-insulating.
- The tested joint sound insulation value is: Rs,w = 37.2 dB for a 20 mm joint with “Rexpandit 20/40”.
- The intumescent “Flaton-flex EN” is free of halogen, antimony, silicone and solvents. The foam is open-cell and has high sound absorption.
- The foam has good thermal insulation properties.
- There is no embrittlement at low temperatures.
- The foam is produced without the use of halogenated hydrocarbons. The product is not hazardous to water.
- On delivery, Rexpandit is free of propellants and does not require labelling according to the Ordinance on Hazardous Substances.
| Name | Length x width x filling depth | Article number |
| Rexpandit 20/40 | 1250 x 48 x 60 mm | 125463 |
| Rexpandit 30/50 | 1250 x 58 x 60 mm | 125592 |
Classified fire resistance: EI 90
Wall and ceiling joints as well as joints between ceilings and walls with possible lateral expansion movement of max. 20 mm:
| Solid Component to solid component | |
| Rexpandit 20/40 | Expansions from 20 to 40 mm joint width |
| Rexpandit 30/50 | Expansions from 30 to 50 mm joint width |
Solid component
Components made of aerated concrete with an apparent density of 650 kg/m³ ± 200 kg/m³ or greater apparent density for normal concrete, hollow blocks and masonry.
Before installing “Rexpandit”, the inner flanks of the joint must be cleaned.
Any formwork burrs, concrete splashes, etc. must be removed.
“Rexpandit” is simply compressed and pushed into the joint.
The ends are to be laid tightly butt to butt. No further fixing is necessary.
Alternatively, “Rexpandit” can also be applied to prefabricated elements during production after consultation.
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Strains from20mmJoint width
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Strains up to50mmJoint width
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fromEl 90Fire resistance
Co-Division Manager/Sales Manager
HT Insulation/Fire Protection
Sales + Application technology
HT Insulation/Fire protection
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