PAR – Polyarylate, a polymer with versatile properties


PAR – Polyarylate, a polymer with versatile properties

Dr. Dietrich Müller GmbH | 23.11.2019

Our modern life, indeed our modern world would be unimaginable without plastic. It is fascinating what different properties different plastics have, such as polyarylate (PAR)

Ahlhorn, 22.11.2019 – The properties of PAR polyarylate

Polyarylate is by definition an amorphous thermoplastic based on tere- and isophthalic acid and bisphenol A in the polymer chain. It also belongs to the group of partially aromatic polyesters. Due to their temperature and UV resistance, these plastics are often used in coatings or as dispersants in adhesives.

PAR is originally transparent with a slight yellow tinge, but can be dyed without any problems. As a UV stabilizer with excellent retention of optical and mechanical properties, combined with its high heat resistance, the plastic is the ideal choice for all applications where it is exposed to weathering.

PAR in comparison

In terms of temperature properties, polyarylates lie between polysulfones (PS) and polycarbonate (PC). Toughness and creep resistance as well as electrical properties are particularly noteworthy. At medium impact strength, polyacrylic acid esters outperform the abrasion resistance of PC. PAR is also characterized by good recovery after deformation.

In various 8000 hour long-term tests, polyarylate, unlike PS and PC, retains its almost unclouded gloss even under UV influence. Unfortunately it is also somewhat more expensive than PC. However, it must also be said that PAR is susceptible to stress cracking caused by hydrocarbon solvents and requires high processing temperatures (approx. 350 °C).

The characteristics of polyarylates (PAR) at a glance:

  • Good dimensional stability
  • Good weather resistance
  • High heat resistance
  • Amorphous
  • Good creep resistance
  • Good chemical resistance
  • heat stabilized
  • Good impact strength
  • Good flow

What is polyarylate used for?

PAR can be used in a wide range of applications, one of the biggest users is the automotive industry. Here the plastics are used, for example, as door handles, or in headlights and mirror mounts. In the safety sector, PAR can be used for firefighter helmets or protective shields, for example.

Of course, it is also used as a UV protective coating for other materials or as a sheathing for cables, ropes and cords. In the electronic sector, polyarylates are used for dielectric films in capacitors, as membranes in smaller loudspeakers and microphones or in printed circuit boards.

An overview of the areas of application of PAR:

  • Automotive industry
  • Electronic displays
  • Electrical components
  • Solar systems
  • Semiconductor molding compounds
  • Decorative exhibitions
  • Coverings, sheathing

Available formats of PAR

As usual, polyarylate can be obtained in the three common formats. Moulded sheets are processed in various thicknesses and tailored to their application factors, with the thickness being adjustable between 0.07 centimetres and 15 centimetres. The rolls are particularly suitable for the production of stamped parts. With thicknesses from 0.05 millimetres to 0.8 millimetres and a width of up to 70 centimetres, all areas of application should be covered. In addition, polyarylate is available in rod form with diameters between 0.3 centimeters and 38 centimeters.

PAR can be obtained as a film from in Ahlhorn. The Kunststoffhaus is a division of Dr. Dietrich Müller GmbH, which manufactures and processes PAR films itself. The PAR films are marketed under the brand name “Aryphan”.

Responsible for this press release:

Dr. Dietrich Müller GmbH
Mr Hans Meier
Zeppelin ring 18
26197 Alpine horn

phone: +49-4435-971010
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