DSM Engineering Plastics



Arnite has excellent short and long-term heat resistance.


Handling the heat

Arnite® has excellent thermal qualities and shows good heat resistance both long and short-term – which makes it ideal for applications ranging from lighting to automotive under the hood.

Short term

Arnite has excellent thermal properties. The HDT-B for Arnite T grades is 170°C when unreinforced and 220°C for glass-fiber reinforced grades. Glass-fiber reinforced Arnite A grades, can perform in even higher HDT-B temperatures of up to 250°C.

Long term

Arnite has excellent high temperature thermal and oxidative stability. UL RTI listings of continuous use temperatures are generally 130-140°C for most Arnite grades. This makes Arnite ideal for demanding automotive and low switchgear applications that feature high temperatures.



The Continuous Use Temperature (measured as the temperature at which the tensile strength is > 50% after being exposed for 5000 h to that temperature) reflects excellent heat resistance for automotive applications.

  CUT (automotive)
Arnite PBT 130 - 140 ºC
Arnite PET 150 - 160 ºC


  Arnite PET GF35 Arnite PET GF50
[0.45 MPa]
250°C 252°C
[1.8 MPa]
235°C 240°C

Dynamic modulus

Arnite PET can be used at peak temperatures up to ca. 220 - 230ºC. Arnite has similar stiffness levels as GF PPA and PPS at temperatures of about 150ºC. 

In addition Arnite polyesters have excellent color stability during aging at elevated temperatures making them suited particularly lighting applications such as lamp bezels and lamp holders.

Dynamic modulus Arnite

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