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Polypropylene (PP) is an economical material that offers a combination of outstanding physical, chemical, mechanical, thermal, and electrical properties not found in any other thermoplastic. At Miller Plastics, we’re your number one source for polypropylene machining, creating a wide variety of parts for your needs within any system. To handle your requests, we operate highly capable CNC machines, perfect for handling very precise polypropylene milling.

Compared to low or high density polyethylene, polypropylene has a lower impact strength, superior working temperature, and greater tensile strength. Polypropylene has excellent chemical resistance in corrosive environments where there are organic solvents, degreasing agents, or electrolytic attack, but poor resistance to aromatic, aliphatic and chlorinated solvents. It is lightweight, non-staining, and exhibits a low moisture absorption rate.

It’s ideal for the transfer of hot liquids and gases, and in vacuum system atmospheres with high heat and pressure.

Polypropylene Material Properties Chart

When handling polypropylene machining, you’ll find two different types are available for use: Homopolymer or Copolymer. Although similar, each exhibits distinct differences in both appearance and performance.

Homopolymer Polypropylene

Homopolymer Polypropylene is the PP most commonly used. It has a high strength to weight ratio and is stiffer and stronger than Copolymer. It exhibits good chemical resistance and weldability, which allows this material to be used in many corrosion-resistant structures.

View the Homopolymer Polypropylene Material Properties Chart

Copolymer Polypropylene

Copolymer Polypropylene material is softer than Homopolymer but has better impact strength, is tougher, more durable, and has better stress crack resistance and low temperature toughness than Homopolymer.

View the Copoly Polypropylene Material Properies Chart

Generally many end-use applications for PP material are achieved by tailoring grades with specific molecular properties and additives during manufacturing.

Polypropylene Advantages

  • Lightweight
  • Impact resistant
  • High compressive strength
  • Excellent dielectric properties
  • Resists most alkalis and acids
  • Resists stress cracking
  • Retains stiffness and flexibility
  • Low moisture absorption
  • Non-toxic
  • Non-staining
  • Easily fabricated
  • High heat resistance

Polypropylene Applications

  • Chemical resistant tanks & linings
  • Laboratory consoles, sinks and ducts
  • Plating barrels and tanks
  • Lavatory partitions
  • Filter press plates
  • Railroad crossing components
  • Pump components and housings
  • Prosthetic devices
  • Die-cutting pads
  • Clean room walls, floors and ceilings

Manufacturing Services

  • Hot gas welding
  • Spin welding
  • Fusion and butt welding
  • Machining with woodworking or metalworking tools
  • Ultrasonic sealing
For more information on how we can handle all your polypropylene machining needs, get in touch with Miller Plastics today. We look forward to working with you!
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