Written on 13.10.2011 - Technology
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Mould-free sealing for ventilation ducts

Poor sealing of ventilation systems in buildings results in rising energy costs and the formation of mould. Air ducts are often constructed using pre-manufactured rubber compression gaskets to seal the transitions between the individual elements. Over time, however, these gaskets lose their elasticity and become brittle. As a result, their sealing effect decreases, leaving cavities in which mould can form.

The German company Henkel AG & Co. KGaA from Düsseldorf now offers a more durable alternative with its Terostat 285 sealant based on butyl rubber. Thanks to its formulation, the sealant has built-in protection against damaging mould attack, which reduces the need for later maintenance. In addition, the plastic butyl sealant has a self-welding capability, which allows it to fill cavities and compensate for tolerances, whereas classic rubber gaskets relax over time and lose their insulating properties. Irrespective of the design involved, Terostat 285 can be applied directly to the construction element – either extruded hot or as a pre-cut profile. The one-component sealant is highly tacky, has a high initial bond strength, and is suitable for sealing nearly all metal and plastic materials.