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Fuel Lines

Long chain polyamides like Rilsan® PA11 and Rilsamid® PA12 resins have been used to produce plastic fuel lines for more than 60 years because of their combination of high flexibility, excellent mechanical performance, and outstanding chemical resistance (to fuel but also to metal chlorides used in road salts). Successive regulations have made it mandatory to use barrier layers for gasoline and to introduce biobased content in fuels, which has generated new challenges for fuel lines.

Gasoline

Key application challenges:


  • Adhesion with various barrier layers that can be used: Arkema has tremendous know-how in making resins with different polarity stick together and is the only material producer on the market to offer structural tie layers (Rilsan® Tieflex) that allow optimized cost-performance balance multilayer constructions.

  • Cleanliness of fuel in order to avoid clogging of sensitive line components like injectors: Rilsan® PA11 is offering unique behavior of low oligomer release, and more generally low extractible components. This material, and the multi-layer tubes using it, allow to comply with the most severe requirements on the market
  • Increasing environment temperatures: Engines are getting more efficient & under-the-hood space is decreasing but turning back to heavy & expensive rubber solutions is not mandatory. Rilsan® PA11 offers improved long term heat resistance vs PA12 & a higher high temperature burst pressure (thus safety factor) especially when combined with structural Rilsan® Tieflex.

Solutions:

 

Name

 

Notes

 

Rilperm® 3020

Standard PA12 construction when no permeability resistance is required
 

Rilperm® 5040

Electrcially conductive PA12 construction with good permeability resistance (EVOH)

Rilperm® 5340

High performance EVOH construction (VW, high temperature PA11) with excellent ZnCl2 resistance on all thickness & low washout (extractible) content

Rilperm® 5341

High performance EVOH construction (VW, high temperature PA11), electrically conductive, with excellent ZnCl2 resistance on all thickness & low washout (extractible) content

Rilperm® 4040

Higher performance PA12-EVOH construction (VW specification) with excellent external ZnCl2 resistance & low oligomer content
 

Rilsan® BESN black P20 TL (PA11) 

 

Widely used in contact with most internal barriers on the market, especially in Japan

Datasheet (US/SI)

*All constructions have a conductive version when needed.

Diesel & Bio Diesel

Key application challenges:

  • Increasing environment temperatures: Engines are getting more efficient & under-the-hood space is decreasing but turning back to heavy & expensive rubber solutions is not mandatory. Rilsan® PA11 offers improved long term heat resistance versus PA12 and higher high temperature burst pressure.
  • Chemical resistance in contact with biodiesel: Aggressiveness due to methyl ester degradation, especially when produced from soybean, requires more and more a switch from standard PA12 to better resisting solutions (Rilsan® PA11).

Solutions:

Name Notes
Rilsamid® AESN black P201 TL  

Standard PA12 solution (Datasheet US/SI)

Rilsan® BESN black P20 TL  

PA11 solution, for higher cold impact & thermochemical (biodiesel) resistance (Datasheet US/SI)

Rilsan® BESN black P210 TL  

PA11 solution with extreme cold impact performance (Datasheet US/SI)

Rilsan® BESN black P126 TL PA11 solution with extreme performances (cold impact, thermal & chemical resistance) (Datasheet US/SI)
In-Tank Lines

Fuel delivery modules require tubing that combine outstanding flexibility with resistance to extreme conditions like high temperature during tank production when in metal, and internal/external fuel contact. Good processability is also needed so that either smooth or corrugated tubes can be made to be.

Solutions:

Name Notes

Rilsamid® AESNO P40 TL

 

Very flexible & natural colored PA12 solution (Datasheet US/SI)

Rilsan® BESNO P40 TL

 

Very flexible & natural colored PA11 solution with better performances (cold impact, thermal & chemical resistance) (Datasheet US/SI)

Rilsan® BESN black P024 TL

PA11 solution high performances (cold impact, thermal & chemical resistance) and complying with most severe requirements on low wash-out content​

Rilsan® Evolution ENO P210 TL

Flexible & natural colored PA11-based alloy with extreme performances of thermal & chemical resistance

Venting Lines & Fuel Filler Necks

Environmental regulations are making it mandatory to continuously handle more gases. This includes areas around the fuel tank and across the whole vehicle, which has led to the increasing quantity and diameter of venting lines. Arkema monowall and multilayer solutions for fuel lines and in-tank lines are well adapted for extrusion up to a diameter of at least 30 mm and corrugation is possible when a more flexible line is needed.

Replacing metal-rubber filler necks with plastic is also a growing trend to save weight and avoid corrosion issues that metal brings. The outstanding combination of performance and processability (extrusion, blow molding) of Arkema resins make it possible to produce parts according to the most challenging designs.

Conductive Solutions Available

Non-conductive fuel lines can create charge separation that leads to the build-up of electrostatic charges. This may create a serious safety concern for spark discharge, therefore a solution using conductive plastics may be preferred in the fuel delivery system.

Conductive grades:


  • Rilsamid® AESN black P202 CTL – PA12 extrusion grade (Datasheet US/SI)
  • Rilsan® BESN black P002 CTL – low wash-out PA11 extrusion grade

  • Rilsan® ASR13 – PA12 injection grade (Datasheet US/SI)
  • Rilsan® BESN black P212 CTL – PA11 extrusion grade (Datasheet US/SI)
  • Rilsan® HT CSR 13 – PPA injection grade (Datasheet US/SI)

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