PAR – polyarylate, a polymer with versatile properties

PAR-CNC milling parts

PAR – polyarylate, a polymer with versatile properties

Dr. Dietrich Müller GmbH | 11/23/2019

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

Ahlhorn, November 22nd, 2019 – The properties of PAR polyarylate
By definition, polyarylate is an amorphous thermoplastic based on tere- and isophthalic acid and bisphenol A in the polymer chain. It is also one of the partially aromatic polyesters. Due to their temperature and UV resistance, the plastics are often used in paints or as dispersants in adhesives.

PAR is originally transparent with a slight yellow cast, but can be colored without any problems. As a UV stabilizer with excellent retention of optical and mechanical properties, in conjunction with high heat resistance, the plastic is the ideal choice for all uses where it is exposed to the effects of the weather.

PAR in comparison

In terms of temperature properties, polyacrylates lie between polysulfones (PS) and polycarbonate (PC). Particularly noteworthy are the toughness and creep resistance as well as the electrical properties. With medium impact resistance, polyacrylic acid esters trump the abrasion resistance of PC. Furthermore, PAR is characterized by good recovery after deformation.

In various 8000-hour long-term tests, polyacrylate, in contrast to PS and PC, retains its almost unadulterated gloss even under the influence of UV. Unfortunately, it is also a bit more expensive than a 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 is versatile, one of the largest users is the automotive industry. Here the plastics are used, for example, as door handles or in headlights and mirror holders. In the security area, PAR can be used, for example, for fire helmets or protective shields.

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

The areas of application of PAR at a glance:

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

Available formats from PAR

As usual, polyarylate can be obtained in the three common formats. Compression-molded panels are processed in various thicknesses and tailored to their application factors, whereby the thickness can be set between 0.07 centimeters to 15 centimeters. The rollers are particularly suitable for the production of stamped parts. With thicknesses of 0.05 millimeters to 0.8 millimeters and a width of up to 70 centimeters, all areas of application should be covered. In addition, polyacrylate is available in rod form with diameters between 0.3 centimeters and 38 centimeters.

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

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