Plastic Properties of Polypropylene (PP)


Polypropylene (PP), a polymer prepared catalytically from propylene which differs from HDPE by having an isostatic replacement of a hydrogen atom by a methyl group on alternate carbon atoms in the main chain. Although largely unreactive chemically the presence of the methyl groups makes Polypropylene slightly more susceptible to attack by strong oxidizing agents than HDPE. A major advantage is Polypropylene's higher temperature resistance, this makes PP particularly suitable for items such as trays, funnelspails, bottles, carboys and instrument jars that have to be sterilized frequently for use in a clinical environment. Polypropylene is a translucent material with excellent mechanical properties and it has gradually replaced the polyethylenes for many purposes. Dynalab Corp's plastic fabrication shop fabricates thousands of catalog and custom PP products.

Polypropylene fabrication quote request.

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563 Polypropylene Carboy Series

563 series of autoclavable polypropylene carboys and large bottles. Capacities range from 5 to 20 L with and without spigots.

Laboratory Sink fabricated fully of white polypropylene

This functional polypropylene laboratory sink was fabricated as a custom job under the strict dimensions and requirements of our customers.

PP Resistance:

Polypropylene Quick Facts:

  • Excellent resistance (no attack) to dilute and concentrated Acids, Alcohols, Bases and Mineral Oils
  • Good resistance (minor attack) to Aldehydes, Esters, Aliphatic Hydrocarbons, Ketones and Vegetable Oils
  • Limited resistance (moderate attack and suitable for short term use only) to Aromatic and Halogenated Hydrocarbons and Oxidizing Agents
  • Maximum Temperature: 275°F 135°C
  • Minimum Temperature: 32°F 0°C
  • Autoclavable: Yes
  • Melting Point: 338°F 170°C
  • Tensile Strength: 4,500 psi
  • Hardness: R95
  • UV Resistance: Poor
  • Translucent
  • Rigid
  • Specific Gravity: 0.90

Polypropylene Fabrication:

Additional Information

  • Great chemical resistance makes Polypropylene a popular choice for plating and chemical tanks, as well as laboratory cabinetry and semi-conductor bench tops
  • This material machines well and is available in many profiles
  • Propylene is autoclaveable for usage in biohazardous environments
  • Other uses include fittings and connectors, storage containers, sinks, and hoods
  • The best joining method is hot air or nitrogen welding. Can be mechanically joined with screws or rivets. Ultrasonic inserts work well
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Additional Plastic Properties

 Polycarbonate  High Density Polyethylene  Low Density Polyethylene Nylon  PVC
 PTFE Acrylic  ABS Polypropylene  Acetal