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Joints are usually exposed to thermal or other movements and must therefore be elastically sealed. The decisive factor for joint sealing is not only the durability of the joint material, but also that it adheres permanently to the flanks. The substrate must be load-bearing, clean, free of separating substances, loose components, and dry.
To prevent the tensile stresses in the joint filler from becoming too high, a sealant must be installed in such a way that it only adheres to the two joint flanks and can expand well in the transverse direction. For this purpose, a commercially available backing rod, for example, is placed in the joint before the joint filler is installed. In order to keep the tensile stresses low, the sealant is not applied in a thick layer, but in the appropriate ratio depending on the joint width.
KÖSTER MS Joint Sealant is a highly elastic, one-component, UV-resistant joint sealant with MS polymer technology. It adheres to numerous surfaces without a primer, and is solvent, silicone, water, bitumen, and isocyanate free. It is used for all types of joints in building construction such as concrete and masonry, sealing of aluminum composite panels, window frames, or natural stone facades.
For higher requirements such as solvent, root, and seawater resistance, a primer with the fast-drying, colorless, solvent free, 2-component adhesion promoter and consolidator KÖSTER FS Primer 2K is necessary.
KÖSTER Joint Sealant FS is a viscoplastic polysulphide based joint sealant that is resilient, UV-resistant, and very durable. KÖSTER Joint Sealant FS is also resistant to a variety of aggressive substances.
KÖSTER Joint Sealant is available as FS-H for horizontal joints and FS-V for vertical joints. The specifications in the Technical Data Sheets apply in each case.
