PP
is a thermoplastic material with high thermal stability and chemical resistance, widely used in packaging, automotive and medical technology.
Abbreviation
PP
Molecular formula
C₃H₆
CAS no.
9003-07-0
General description
Polypropylene (PP) is a common semi-crystalline, non-polar, thermoplastic polymer produced by the chain polymerisation of propene, a colourless and odourless gas.
Its molecular structure with an additional methyl group gives it versatile properties. These include high thermal stability, mechanical stability and remarkable chemical resistance.
Due to its numerous advantages, PP is one of the most commonly used plastics worldwide and is used in various industries, from packaging and automotive to medical technology.
PP offers
Excellent thermal stability
PP exhibits high heat resistance and melting points that are more resistant than those of polyethylene (PE).
Mechanical stability
PP has excellent strength and rigidity, especially when filled with glass fibres or talc.
Chemical resistance
PP is particularly resistant to many organic and inorganic chemicals.
Properties of PP
Thermal properties
Polypropylene offers excellent thermal resistance. The melting temperature of PP is between 160 °C and 165 °C, making it ideal for applications that require high temperatures. With a flammability temperature of 350 °C to 370 °C and an ignition temperature of 390 °C to 410 °C, it remains stable even in extreme conditions.
Mechanical properties
PP is lightweight yet robust. With a density of 0.895 to 0.920 g/cm³, it combines low material costs with high strength and flexibility. Its excellent elasticity is evident in its high elongation at break of up to 800%, while its modulus of elasticity of 1.3 to 1.8 GPa also makes it ideal for structural applications.
Chemical properties
Polypropylene is chemically resistant to many organic and inorganic substances. It effectively resists acidic and alkaline solutions as well as alcohols, making it the perfect choice for chemical processing and storage. However, it is less resistant to strong oxidants and fuels at high temperatures.
Other specific properties
PP is an outstanding material in electrical engineering thanks to its high dielectric strength and excellent insulation properties. With minimal water absorption, it is ideal for applications in humid environments.
Processing instructions
Areas of application PP
Packaging industry: Polypropylene is frequently used in the form of films and rigid packaging due to its versatility. Its chemical resistance makes it safe for food and industrial applications.
Medical technology: PP is ideal for disposable items such as syringes and masks, as it is sterilisable and chemically resistant, meeting the demands of the industry.
Automotive industry: Polypropylene is used for interior and exterior vehicle parts due to its light weight and strength, especially when combined with reinforcing materials.
Construction industry: PP is used for pipes and containers, where its structural strength and weather resistance are valued in outdoor applications.
Textile industry: Polypropylene is used in functional clothing due to its lightness and elasticity, while it is also used in technical textiles and plastic parts for various industrial sectors.
Polypropylene (PP) is an indispensable plastic for many industries due to its versatile properties. Thanks to its low-cost production and high recyclability, polypropylene is not only versatile, but also a sustainable choice for the future.
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