DuPont: Fluoropolymers for electrical insulation

Innovations in fluoropolymers include new products and technologies for low-loss DuPont™ (www.dupont.com) Teflon® PTFE and FEP wire constructions. A new foam grade, Teflon® FEP TE 9810, produces smaller, better dispersed and more homogenous voids compared to previous Teflon® foam grades for enhanced electrical properties in wires with melt extruded fluoropolymer insulations. Depending on the construction, this grade, Teflon® FEP TE 9810, has the ability to be self skinning, offering production of cost-effective, high-performance foam insulation for data cables. It enables the extrusion of all three sections of a skin-foam-skin construction – an inner-skin to ensure mechanical adhesion of the foam to the copper conductor, the foam itself and an outer, protective skin – in a single shot without the need for a second extruder and without the need for a multi-layer crosshead.

Meanwhile a new, licensable extrusion technology from DuPont incorporates air into the extruded Teflon® PTFE insulation for higher performance, low-loss data cables.

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DuPont™ Teflon® and DuPont™ Tefzel® fluoropolymers are commonly used for their insulating capabilities under harsh environmental conditions including high temperatures up to 260oC. Whereas Teflon® PTFE, PFA and FEP are chosen for their thermal and chemical resistance in combination with electrical and low-friction properties, Tefzel® ETFE is chosen for its mechanical toughness, ease of processing and high-energy radiation resistance. Both Tefzel® and Teflon® have low dielectric constants and high volume resistivity as well as approved thermal class ratings (SAE, ISO) for wire insulation.

DuPont de Nemours (Deutschland) GmbH, Bad Homburg v.d.H., Germany