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The systems consist of an A-component and a cross-linking B-component, which are mixed with each other in a predetermined mixing ratio. After mixing the components, most systems react by their own at room temperature and generate a soft elastic silicone foam seals or permanent elastic silicone elastomers.
FERMASIL is processed using low pressure mixing and dosing machines for two material components. Suited for silicone sealants in dynamic or static mixing systems. Henkel recommends dynamic mixing systems for increased ease of material processing.
FERMASIL can be used at a constant temperature from -60 up to +180 °C, while maintaining its softness and flexibility at any time. Due to its closed cell structure, FERMASIL does not absorb water and is suitable for use in tropical or damp environments. It is also highly resistant to other chemicals (e. g. commercial cleaning agents, alcohols, diluted acids and lye’s, brake fluids, and cooling agents).
Henkel can draw on the variety of more than 200 application-specific formulations of the FERMASIL product family.
Depending on customer requirements, FERMASIL systems can express many different characteristics. Different part applications are protected effectively in extreme surroundings. Numerous FERMASIL recipes are available for this.
High Temperatures
The different softness grades and flexibilities of special FERMASIL silicone systems are maintained even at long-term temperatures of -60 to +180 °C, in special cases to 250 °C, and for short periods even to +350 °C.
Very Low Water Absorption
Because of the closed-celled structure of silicone foams, they are tropicalized and wet room safe; infiltration protection to IP 69K and NEMA 4-6p are possible.
High Chemical Resistance
FERMASIL silicone systems are resistant to many chemicals (e. g. common cleaning materials, alcohols, dilute acids and alkalis, brake fluids, oils and lubricants, coolants) and are low fogging.
Flexibility
Ease of flow, reactivity and color can be multifariously varied.
Curing at Room Temperature
FERMASIL silicone foams cure on the component at room temperature in a time range from approx. 20 minutes to around 12 hours, becoming a soft foam seal. The part can then be sent on to further processing.
Crystal Clear or Translucent Silicone
PottingTemperature stable to 180 °C, very high tear resistance and flexural strength (example extension at break 600 %), UV-stable.
Flame Protection in Accordance With UL 94 HF-1
FERMASIL silicone systems can be equipped with UL 94 HF-1 flame protection; any flame after this is extinguished within 10 seconds, with max. 30 seconds afterglow.
ATEX Approval
For FERMASIL silicone foam seals, an ATEX approval for component applications in explosive environments e. g. mining, oil drilling is possible.
FERMASIL sealing foams can be efficiently and accurately applied onto parts from the most varied industry sectors using the FIPFG (Formed-In-Place Foam Gasket) technology with the Sonderhoff mixing and dosing machines. Depending on the viscosity, they are either freely applied as liquid material into a groove or highly viscous material on a 2D or 3D part surface.
Only the exact interaction of possible setting parameters of the mixing and dosing machine and the selected FERMASIL material system enables a reliable sealing against moisture, dust and other environmental influences together with the overall construction of the industrial component.
The chemical reaction of FERMASIL sealing foams is initiated by mixing the A- and B-components. The applied compound foams up to a uniform gasket under room temperature conditions.
