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Polypropylene (PP)

Plastics
PPPolypropyleneInjection MoldingCommodity

Cheap, chemical-resistant commodity thermoplastic — the workhorse of consumer injection molding.

PP is the lowest-cost, highest-volume engineering polyolefin. It is chemically inert (resists acids, bases, fuels, and most solvents), makes excellent living hinges, and is food-safe in standard grades. It is also low-density (0.90 g/cm³ — floats in water).

Mechanical and physical properties

PropertyValue
Tensile strength35 MPa
Elongation at break150%
Density0.90 g/cm³
Modulus1.5 GPa
Max service temperature100 °C
Chemical resistanceExcellent

Typical applications

  • High-volume consumer packaging.
  • Living hinges (flip-top closures).
  • Chemical containers and labware.
  • Automotive interior trim.
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