Plastic Pall (PP) Rings

MACH Engineering’s lineup of random tower packing products includes plastic Pall Rings in a range of sizes and configurations. Our plastic Pall Rings, also comparable to HiFlow Ring® and FLEXIRING®, typically feature a long cylindrical shape, with large windows on the sides and several crossbars, forming a lightweight web of edges that disrupts liquid flow without taking up excessive amounts of tower space. Alternatives to Pall Rings include solid-walled Raschig rings, which are typically made from ceramic or metal, and round plastic Tri-Packs® packing.

Packing Factor
Wet/Dry (1/ft)
Surface Area
Void Space
5/8″ (15mm) 97 7.8 108 86
1″ (25mm) 52 5.9 64 90
1.5″ (38mm) 32 4.8 44 91
2″ (50mm) 25 4.3 33 93
3.5 (90mm) 16 3.8 26 93
Materials and Options

MACH Engineering Polypropylene Pall Rings range in size from 5/8 to 3 inches in diameter. Larger rings have a less geometric surface area and a larger void fraction as well as a lower weight per ft3. To meet the needs of our clients, we manufacture Pall Rings in several different materials:

  • PP (polypropylene)
  • PE (polyethylene)
  • PVC (polyvinyl chloride)
  • CPVC (Corzan®)
  • PVDF (Kynar®)
  • PFA (Teflon®)

PE and PP are both low-density plastics with a low compression strength, suitable for temperatures up to 90˚C or 100˚C, respectively. PVDF is the densest option, with the highest compression strength. It’s suitable for temperatures up to 150˚C. PVC offers good density but is only suitable for use in temperatures up to 60˚C.

For a detailed list of potential applications and help with choosing the best plastic Pall Ring material for your needs, contact MACH Engineering and speak with one of our experts directly. Though our off-the-shelf packing materials provide options for most industrial applications, we also offer custom engineering services for your specific needs.

Benefits of PP Rings

Polypropylene Pall Rings offer several benefits compared to other random packing materials:

  • excellent strength and stability when exposed to high temperatures or harsh chemicals
  • higher capacity and efficiency and lower pressure drops than saddle-shaped packing
  • high levels of separation efficiency and operational flexibility
  • robust and suitable for use in deep packed beds
  • oldest and most common type of packing used in the past 40+ years
Applications and Industries

Plastic Pall Rings are among the most commonly used tower packing materials for applications involving gas and liquid separation. Because of their ability to withstand corrosive environments, they’re a mainstay in chemical process towers. Other applications include CO2 absorption, SO2, HCl and HF absorption or stripping, and chlorine and chlorine dioxide absorption in water or caustics.

Whatever the application, our plastic Pall Rings will deliver efficient, reliable performance at an affordable price point.

The Tower Packing Experts

Plastic Pall Rings are most reliable when you have the right product for your application. As a smaller firm with greater customization capabilities, MACH Engineering is well-positioned to partner with organizations in any industry. We’ll work with you to find the most efficient packing type for any application.

Whether you’re building a new tower or improving an existing one, count on MACH Engineering – a top pall ring company – for quality products, expert advice, and exceptional flexibility. Unlike other plastic ring packing manufacturers, we limit the scope of our business to our specialties, which means we always have the resources to deliver world-class service in everything we do.

Find out why we’re the tower packing experts. To request a quote or place an order, get in touch with our team directly by filling out a form on our contact page.

Pall Rings

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