Polypropylene


Overview

Polypropylene provides excellent resistance to organic solvents, degreasing agents and electrolytic attack. It has a lower impact strength, but its working temperatures and tensile strength are superior to low or high density polyethylene. It is lightweight, resistant to staining, and has a low moisture absorption rate. This is a tough, heat-resistant, semi-rigid material, ideal for the transfer of hot liquids or gases. It’s recommended for vacuum systems, where higher heats and pressures are encountered.

Benefits:

  • Good chemical resistance.
  • Good dielectric properties.
  • It is physiologically inert, so in natural form, it is approved for use in contact with food.
  • Low specific gravity.
  • Good stability to temperature.

Weaknesses:

  • Compared to the engineering plastics it has low thermal and mechanical properties: tensile stress, flexural and compressive strength, etc. Compared to PE it is more rigid but less shock resistant.

Applications:

Polypropylene is commonly used for mechanical components in corrosive environments such as the chemical industry. This is due to its high resistance to acids and alkalis and a high temperature resistance. Typical components are:

  • Valves.
  • Flanges.
  • Gears.

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