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Polypropylene (PP) is a material usable for a variety of different applications at temperatures up to 80°C. It combines reasonable costs with impeccable chemical resistance, low weight and generally speaking excellent mechanical properties. PP homo-polymers have a glass transition temperature of -10°C and become brittle at temperatures below 0°C. Copolymers, which are the most important material for the components of conveyor systems, possess better impact resistance at temperatures from -15°C to -35°C, at the expense of less rigidity and lower thermal performance.

PP has extremely low moisture absorption of less than 0.1% when saturated. In combination with its excellent resistance to hydrolysis, this makes the material extremely suited to many applications. PP has high resistance to a large diversity of chemicals, including acids, alcohols, warm water and most cleaning agents. The material possesses average resistance to aromatic or halogenated hydrocarbons. It has limited UV resistance.

For applications where electrical discharges may cause problems, KIK uses antistatic PP compounds based on a special conductive carbon. Adding conductive carbon reduces the impact resistance of these materials.

For applications that require extra flexibility, KIK uses a specially manufactured PP material, i.e. PPK. This material combines high flexibility with excellent impact resistance.