Interpack® tower packing, also known as metal conjugate rings, offers a compromise between spherical and cylindrical packing products, providing some of the benefits of both in select applications. Their unique structure — known as a conjugate curve — has a good surface-area-to-void-space ratio and a low height-to-diameter ratio. The result is a product that is less susceptible to deformation and suitable for use in higher bed heights


MACH Engineering offers Interpack® metal tower packing in multiple sizes and materials. We stand behind our products with a material quality guarantee as well as expert advice and engineering consulting services.

Interpack® conjugate rings
Product Details
Nominal Size (in) 3/8 (10 mm) 5/8 (15 mm) 3/4 (20 mm)
Void Fraction (%) 92 96 96
Geometric Surface Area (ft2/ft3) 189 110 80
Weight – SS304 (lb/ft3) 37.5 22.5 23.7
Packing Factor (1/ft) 246 122 73


Our Interpack® tower packing is made from sheet metal that has been bent into a cylindrical shape with tabs along each edge. When installed in a tower bed, Interpack® rings will arrange themselves in a structured formation, with minimal risk of deformation.

Materials & Sizes

Our products come in 3/8″, 5/8″ and 3/4″ sizes, and are customizable to meet the specific needs of your application. Materials we work with include:

  • 304 and 304L stainless steel
  • 316 and 316L stainless steel
  • Carbon steel
  • Aluminum

Stainless steel and aluminum offer the best corrosion resistance, particularly in the low-carbon variants (304L and 316L). Both are lightweight and strong, with excellent structural integrity. Carbon steel is a durable, cost-effective choice for applications where corrosion resistance is of less concern.

For more information about material options, sizes and specifications, contact MACH Engineering directly.


Metal conjugate rings’ main benefit is their ability to reduce pressure drop and deliver high mass transfer performance. They have good mechanical strength with a low overall weight, which makes them easier to install, remove and use in high-volume tower beds. Their open structure provides minimal flow resistance and small bulk density.

Applications & Industries

Applications that use our Interpack® tower packing include extraction and distillation, and any other process involving drying towers, carbon dioxide degassing towers, scrubbing towers, ozone contact reaction towers, and related vessels. For information about specific use cases, contact MACH Engineering directly.

Request a Quote Today

MACH Engineering is a proud partner to chemical processors, oil and gas companies, pulp and paper mills, general manufacturing plants, and other businesses. We bring industry expertise and an exclusive focus on tower packing and related materials. We can recommend the right product for your facility and stand behind it with world-class customer service.

To request a quote for Interpack®-style tower packing, call or email our Houston headquarters today.

Interpack® conjugate rings

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