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01/10/2007
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Polyamide 12 multilayer tubing systems (MLTs) for coolant lines are now even more flexible, thanks to a modification carried out at the molecular level by scientists at Degussa. No plasticiser has been added.
Coolant lines in the 8000 series, which have diameters up to 30mm and wall thicknesses ranging from 1 to 1.5mm, consist of three layers. A polypropylene forms the inner layer. On top of this is an adhesion-promoting layer, followed by an outer layer made of the high-grade specialty polyamide Vestamid.
MLT 8000.3 has the greater flexibility while MLT 8000.1 has a higher bursting strength, especially at high temperatures. Users can therefore choose a system that matches requirements.
Plastics have some advantages over elastomer hoses. The outer polyamide layer provides low-temperature impact strength, stone impact resistance and chemical resistance. The lines withstand brief external temperature loads exceeding 150ºC and have high heat-ageing resistance and good bursting strength.
The inner polyolefin layer also ensures resistance against the ethylene glycol-water mixtures, even at temperatures as high as 135ºC.
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Author
Roger Bishop
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Copyright European Automotive Design.
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