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News

Fuse box uses toughened nylon 66 has low temperature impact strength and uniform surface finish

Clariant (Schweiz) AG : 27 March, 2014  (Application Story)
Clariant is supplying a special nylon 66 compound for a moulded power distribution box manufactured by GEP Power Products, in Milwaukee, Wisconsin, USA. The material exhibits low-temperature impact resistance and durability, good dimensional stability and uniform surface finish.
GEP Power Products supplies standard and custom electrical components to some of the world’s leading manufacturers of trucks, buses and off-road vehicles, including FreightLiner, Thomas, John Deere and International. GEP grew out of Precision Cable Assemblies, which started in business some 30 years ago, producing wire and cable for the automotive and truck industry. GEP was formed about eight years ago to make and market other electrical products like the power-distribution box.
 
A problem with most toughened nylons is that they tend to develop a swirled or mottled surface during the injection-moulding process as a side-effect of the impact modifying additives. This was unacceptable to GEP; Renol 6608LLT is an impact-modified nylon 66 that is formulated to minimise that effect.
 
“We were trying to develop an enclosure to protect an electrical fuse block,” explains Jacek Korczynski, GEP’s Vice President – Design Development. “Because this device is normally installed on the underside of large commercial vehicles, it can be subject to terrible abuse in extreme heat and cold. We test these boxes by freezing them to -40C and firing thre-quarter inch rocks and gravel at them, so we needed a really tough plastic.”
 
Initial samples were a bit too flexible, but this was overcome with some minor design changes that added stiffness. The GEP power-distribution boxand has now completed 18 months service, including off-road service on the frozen North Slope of Alaska.
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