fuel line made of PA612 inner layer

PA612 replaces PA6 as inner layer in fuel line systems

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  • Alcohol containing fuels as a challenge
  • PA612 offers significantly reduced levels of extractable substances
  • Lower fuel consumption

Evonik Industries responds to new requirements in the automotive industry – low extractable fuel line systems. The company introduced its multilayer tubing system (MLT) 4800 which features an inner layer of low extractable polyamide 612 and offers significantly reduced levels of extractable substances.

Alcohol containing fuels and lower fuel consumption

The use of fuels that contain alcohol, for example biofuels containing ethanol, can lead to the extraction of substances from the inner walls of conventional gasoline lines. Under certain extreme conditions these substances can clog the nozzles in new, sensitive fuel systems, which use small-diameter nozzles to create an atomized spray of gasoline and air for fuel injection in order to decrease fuel consumption. To reliably counteract this, the automotive industry is looking for new fuel line materials with significantly reduced extraction.

PA6 inner layer replaced by PA612

Evonik has been offering its conductive MLT 7440 system for several years. The new MLT 4800 now supplements it with a non-conductive system. It is based on the MLT 4300, with an outer layer of Vestamid polyamide 12 and a barrier layer of ethylene vinyl alcohol (EVOH) to prevent fuel permeation. In the MLT 4800, however, the PA6 inner layer is replaced by a newly developed, low extractable Vestamid polyamide 612. The mechanical characteristics, chemical resistance, and permeation behavior are on the same level as the MLT 4300, which is the currently most used MLT in Europe, according to the company.

Main Picture: The new multilayer tubing system 4800 with an inner layer of low extractable polyamide 612 offers significantly reduced levels of extractable substances.
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