Show stand features cable and wire materials

A DuPont (UK) product story
Edited by the Engineeringtalk editorial team Apr 5, 2006

German show to include fibre for protecting communications and data cables, wire enamels and isolating coatings, and developments in fluoropolymer technology for making electrical insulation.

DuPont is demonstrating the company's range of materials for the cable and wire industry during Wire 2006 in Dusseldorf, Germany, 24th to 28th April 2006 (stand G58, hall 11).

Part of the display at the show will include Kevlar brand fibre for the protection of communications and data transmission cables.

DuPont Performance Coatings will provide an overview of its range of wire enamels and isolating coatings.

And DuPont Fluoropolymer is using Wire 2006 to introduce developments in fluoropolymer technology for the manufacture of electrical insulation for cables and wires.

These include Teflon FEP CJ 99, which combines high levels of stress cracking resistance with speed of processing, and Teflon 640 XT, which has been modified to enable the particularly efficient manufacture of high-performance cables.

Teflon FEP CJ 99 is an all-purpose melt-processable copolymer grade of tetrafluoroethylene and hexafluoropropylene.

Its high melt flow rate (MFR = 9g/10min) enables high productivity during the manufacture of wire and cable insulation.

Comparative analysis of thin films of resin, using standard ASTM D 2176 to measure the MIT Flex Life, shows high performance in terms of stress cracking resistance of Teflon FEP CJ 99.

Those FEP grades with similar levels of stress crack resistance have a lower melt flow rate and are thus lower in productivity.

The advantageous combination of high stress crack resistance and high productivity means this particular grade is highly suitable for cables requiring compliance with specific winding tests at temperatures between 220 and 230C.

Further applications include the primary insulation of large diameter automotive cables, electrical floor heating cables and the jacket insulation of LAN and coaxial cables.

Teflon 640 XT, a PTFE fine powder resin for paste extrusion, enables a broad range of reduction ratios during cable manufacture, ranging from 250:1 to 5000:1.

Even at both extremes, a lubricant content of only 16% of the overall weight is needed, with the consequence that one PTFE-lubricant mixture can permit many reduction ratios.

The required extrusion pressure is low.

Teflon 640 XT facilitates the manufacture of particularly high-quality, thin-walled insulation with low diameter fluctuations and virtually no surface defects.

The low lubricant content allows for increased extrusion speed and lower lubricant usage.

Applications include wires and cables for automotive engine compartments, antennas or medical equipment.

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