PU-based closed-cell foam sealant system debuts at Fakuma

September 12, 2017

SonderhoffA polyurethane-based foam sealant system for highly water-resistant applications will be introduced by the Sonderhoff Group (Köln, Germany) next month at Fakuma. The technology reportedly closes the gap between high-priced, predominantly closed-cell materials, such as silicone foam, and lower-priced, mixed-cell polyurethane (PU) foam. It also offers current users of single-component sealing technology a less expensive alternative, according to Sonderhoff, which recently became part of adhesives giant Henkel AG & Co.

The new Fermapor CC technology is a room-temperature, cross-linked two-component system that forms a predominantly closed-cell PU soft foam seal using the newly developed FIP CC foaming process. The foam structure is comprised of dense, uniform cells. Thanks to its closed-cell structure, the Fermapor CC foam seal exhibits very high resistance to water absorption, and is 90% less permeable to air than mixed-cell PU foam. The material has a smooth, slightly shiny surface, and is significantly more resistant than conventional PU foam beads.

Even if a gvien application were to cause damage to the surface, laboratory and practical tests show that water intake is minimally affected. Compliant with REACH and other regulations, Fermapor CC PU is suited for sealing components at temperatures between -40 to 80° C, and even up to 160° C for short periods of time.

Sonderhoff has patented a new sealing technology with the DM 402 CC mixing and dosing system for the metering of Fermapor CC. The technology follows the well-known FIPFG process, which is a production standard in many industries. The novelty, said Sonderhoff, lies in the sealing foam’s ability to reach its full size shortly after being applied to the component. A quality control system, thus, can determine whether the seal has been applied to the desired height over the entire component contour immediately after sealing.

Sonderhoff will demonstrate its new FIP CC technology at Fakuma, which comes to Friedrichshafen, Germany, from Oct. 17 to 21.

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