Products for mass transfer operations

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Product Overview

An advance on the Raschig Ring, the Pall Ring has similar cylindrical dimensions but has two rows of punched out holes, with fingers or webs turned into the centre of the cylinder, which significantly increases the performance of the packing, in terms of throughput, efficiency and pressure drop.

We are able to offer these in a variety of plastics: Polypropylene, PVDF, HDPE, Glass Filled Polypropylene and PVC.

And in the following sizes:
5/8″ (16mm); 1″ (25mm); 1.1/2″ (38mm);
2″ (50mm); 3.1/2″ (90mm)

As a standard we offer our Pall Rings in a natural colour but if you need a different colour we are more than happy to help. (Extra costs apply)

Capacity versus Pressure Drop

• Most suited in low pressure drop, high capacity applications;
• A range of sizes allows the tower to operate at an optimum
efficiency and throughput;
• High degree of randomness;
• Consistent ratio of free and blocked passages, independent
of orientation;
• Large surface area : volume ratio augments the rate of
liquid film surface renewal to improve mass transfer.

Hold-up and Two-phase Contact

• Promotes highly efficient two-phase contact and distribution;
• A relatively high liquid hold-up promotes high absorption efficiencies, especially in cases where the reaction rates are slow;
• Uninterrupted and consistent passages for gas and liquid flow.


• Open, cross-linked design provides a highly efficient used of the ring’s surface area;
• Robust to variations in liquid and vapour distribution.

Mechanical Strength

•Its internal cross-structure of diametrical spars make it mechanically
robust and suitable for use in deep packed beds.


  • Capacity versus Pressure Drop
  • Hold-up and Two-phase Contact
  • Versatility
  • Mechanical Strength
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    Technical Information

    Performance Consideration

    Packing size mm1625385090
    Free space %8891949596
    Specific Surface Area
    Number per unit volume
    Packing factor3151761078051

    Specific Weight kg/m3

    Packing Size mm1625385090




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