PP (Polypropylene)

Polypropylene (PP) is characterized by its molecular structure (chain length of the polymer, lateral arrangement of the methyl groups in the polymer chain).   It demonstrates a high strength, even at low specific weight.   

  • Higher strength, hardness, rigidity, and impact strength in comparison to polyethylene. These properties are, however, lower when compared to other materials, such as polyamide.
  • Glass transition temperature of 0° C - 10° C, which causes brittleness in cold temperatures. The upper glass transition temperature falls between 100° C and 110° C. The crystallite melting range is 160° C – 165° C.
  • PP can be filled with mineral fillers, such as talcum, chalk, or glass fibers. This considerably broadens the spectrum of mechanical properties (stiffness and operating temperatures).
  • Resistant to moisture.
  • Stable against almost all organic solvents (but swelling is possible) and fats, as well as most acids and alkalis.
  • Due to its low surface energy, it does not respond well to bonding and printing.
  • PP is odorless and skin-friendly, it is physiologically safe.

Areas of application include the automobile sector, where glass fiber reinforced PP types are often used.  In the building sector PP is used for valves, fittings, piping, and profiles.  In ventilation and climate-control technology, flame-retardant PP types are often used.  The material is also used for packaging and containers.    


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