The polypropylene (PP) properties are determined by the molecular structure (chain length of the polymers, lateral arrangement of the methyl groups in the polymer chain).  It demonstrates, in particular, a high strength at low specific weight.   PP can be filled with mineral fillers such as talc, chalk, or glass fibers. This significantly expands the range of mechanical properties (stiffness, operating temperatures, etc.).

Characteristic Features:

Higher strength, hardness, rigidity, and impact strength in comparison to polyethylene.

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.

Water resistant.

Resistant 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 construction sector, it is used for valves, fittings, piping, and profiles.  In ventilation and climate-control technology, flame-retardant PP types are often used.