Pall Ring Packing

MACH Engineering’s lineup of random tower packing products includes metal and plastic Pall Rings in a range of sizes and configurations. With more than 25 years of experience designing and engineering tower packing media, MACH Engineering is a longstanding partner to clients across the country. We can help you determine the type of pall rings that will best fit your needs.

Metal Pall Rings

Types of Pall Rings Available


Metal Pall Rings

Pall Rings

Plastic Pall Rings


Ceramic Raschig Rings

Features and Characteristics

Pall Rings vs Rashig Rings

Friedrich Raschig, a German chemist, first invented Raschig ring packing as a way to perform efficient distillation. Raschig rings are cylindrical tubes that have equal height and diameter. They’re typically made of metal or ceramic, though glass is also used in some applications. The Raschig ring is considered the first generation of ring packing, and since its invention, the ring design has been altered to be more efficient and handle higher capacities.

The pall ring – most commonly made of metal, ceramic, or plastic – was a significant advancement for random packing. Pall rings are similar to Raschig rings in that they have equal height and diameter.


  • The significant difference between the two is that pall rings have windows and tabs punched in the walls.
  • Adding the windows and tabs increased the capacity and efficiency of the ring significantly, as the gas and liquid distribution is improved.
  • The tabs being folded into the center of the tube creates drop points, allowing more internal surface area to be used.

This improved packing design is flexible, has low resistance and high separation capabilities.


Plastic Pall Rings

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®)

Metal Pall Rings

MACH Engineering manufactures metal pall ring packing from 304, 316, 304L and 316L stainless steel, as well as carbon steel and aluminum. Carbon steel is cost-effective and durable, but not suitable for use in corrosive environments. Stainless steel pall rings and aluminum pall rings offer better corrosion resistance — specifically the 316 and low-carbon 316L varieties — but are more expensive.

Available sizes include 1″, 1.5″, 2″ and 3″. For detailed specifications and more information about finding the right size and quantity for your application, get in touch with a MACH Engineering representative directly.



Metal Pall Rings

Nominal Size (in) 1 (25 mm) 1 1/2 (38 mm) 2 (50 mm) 3 (76 mm)
Void Fraction (%) 96.2 96.7 97.5 97.4
Geometric Surface Area (ft2/ft3) 64.6 44.2 32.3 21
Weight – SS304 (lb/ft3) 18 15.4 11.6 16.5
Packing Factor (1/ft) 70 46.2 39.2 24.3
Pcs/ft3 1514 430 184 54


Plastic Pall Rings

Nominal Size (in) 5/8 (15 mm) 1 (25 mm) 1 1/2 (40 mm) 2 (50 mm) 3 1/2 (90 mm)
Void Fraction (%) 86 90 91 92 93
Geometric Surface Area (ft2/ft3) 108 67 44 38 27
Weight – PP (lb/ft3) 7.75 4.40 4.75 3.85 3.45
Packing Factor (1/ft) 97 52 32 25 16
Applications & Industries

Metal Pall Rings

Metal pall rings’ versatility means they are ideal for many industrial processes — especially those that need both a high capacity and a low-pressure drop under vacuum. Some processes they can help with include H2S, NH3 and SO2 absorption, direct contact cooling and steam stripping. They are not typically used for liquid redistribution. Other metal pall ring applications might include decarbonization, degassing and heat recovery.

You’ll find our metal pall rings in reaction towers, distillation columns and quench towers, as well as other vessels. Metal pall rings packing is used in various industries, and MACH Engineering can cater to industries like pharmaceuticals, chemical and food processing, water and wastewater, refineries and petrochemical.

Plastic Pall Rings

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.

Request Your Quote

MACH Engineering uniquely specializes exclusively in tower packing and related products and services, meaning we are better positioned to provide expert advice and dedicated customer support.

We can run process simulations or provide other engineering consulting services if you’re unsure which type of tower packing is best for your application.

We have a large selection of pall rings in stock and ready to ship. Contact us by phone to request a quote and find out how MACH products and services can help your operation.