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KERAFIX® Firestop Filler · Fire-resistant sealants
KERAFIX® Firestop Filler is a halogen-free, intumescent sealant based on expandable graphite. It begins to react at temperatures of around 140 °C, expanding to 26 times its original volume to form a pressure-resistant foam structure. This solvent-free and low-emission material adheres to a range of different substrates and offers high temperature resistance, making it ideal for sealing joints and penetrations in wall and ceiling structures.
Applications
- Joints between separating walls
- Connections between walls and ceilings or floors
- Openings
- Cracks
- Gaps
- Cavities and joints
- Fire protection doors and fire-rated glazing systems
- Pipe penetrations
- Cable penetrations
Properties
- Halogen-free and intumescent
- Solvent-free and low-emission
- Insensitive to moisture
- Adheres well to a variety of substrates
- Can be used in a wide range of indoor and outdoor applications
Downloads
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Technical documents and related products
Use the KERAFIX® Firestop Filler technical documents to check dimensions, installation and suitability. For firestop sealants and joint sealing materials selection, compare the following products in the same material category; matching categories do not imply interchangeability.

