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Rilsan® HT - high temperature polyamides

Rilsan® HT - The first flexible polyphthalamide (PPA)-based material to replace metal in tubing for high temperature automotive and other demanding industrial applications. This entirely new class of flexible, partially bio-based polyphtalamide combines the high temperature resistance of conventional PPA grades with a flexibility unprecedented in this material class, creating opportunities to replace metal that were previously unimaginable.

How is Rilsan® HT different from classic PPA?

Since classic PPA resins are known for their inherent brittleness limiting their use to rigid or injection-molded parts, Arkema has developed Rilsan® HT specifically to fill this gap. Due to its specific polymer matrix, which is based largely on long-chain chemistry, Rilsan® HT stands out above all by a flexibility previously unknown in this material group. This revolutionary flexibility of Rilsan® HT offers a step change in PPA-based materials and makes it the first flexible PPA extending metal substitution to new applications like severe engine-compartment service or other demanding industrial uses.

In contrast to other high temperature thermoplastics, Rilsan® HT also exhibits excellent long-term resistance to thermo-oxidation and chemical aging at high temperatures, as well as very low moisture absorption that produces exceptional dimensional stability and low tendency to creep. 

Car Engine - Under the Hood

Key properties

Rilsan® HT offers both the properties of long-chain Rilsan® PA11 and classic PPA, combining the high temperature resistance of conventional PPA grades with a flexibility previously unknown in this material class.

Low moisture uptake, excellent long-term resistance to thermo-oxidative and chemical aging, as well as ease of processing complete the unique performance spectrum of Rilsan® HT resins.

Rilsan® HT - Properties Comparison

Focus: Flexibility

Rilsan® HT is the first PPA to combine the high temperature resistance of conventional PPA grades with unprecedented flexibility for this class of materials. Largely based on long-chain chemistry, Rilsan® HT offers the optimum synergy of long-chain Rilsan® PA11 and classic PPA, resulting in outstanding flexibility and ease of processing.

Rilsan® HT is the first PPA to combine the high temperature resistance of conventional PPA grades with unprecedented flexibility for this class of materials.

Focus: Low density, lightweighting

Rilsan® HT resins are more than 10% lighter than classic PPA and nearly 8 times lighter than steel.

Main applications

Automotive:

  • Air management (e.g. brake booster)
  • Oil management (e.g. cooling line)
  • Aqueous media management (e.g. SCR)
  • Aggressive media managment (e.g. blow-by)
  • ...

 

 

Other markets:

  • Pneumatic / hydraulic
  • Cable protection
  • Monofilament
  • Fibers
  • ...

Processing

Rilsan® HT processes similar to other high performance, long-chain aliphatic polyamides:

  • Extrusion: use the same equipment as used for PA11/PA12
  • Injection: use the same equipment as used for PA11/PA12
  • Extrusion blow molding: use the same equipment as used fro PA/PE

 

In addition, Rilsan® HT is also amenable to further processes such as spunbonding (a nonwoven manufacturing technique), coating, and filament production. Thanks to its very low moisture absorption, Rilsan® HT offers a large processing window compared to classic PPA-based resins and is easy to handle overall also compared to PPS. This avoids additional upstream or downstream production steps, and helps reduce scrap levels.

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