HELICOFLEX® Resilient Metal Seal

The HELICOFLEX® seal is a high performance, flexible metal seal that has exceptional compression and elastic recovery properties. This seal is composed of a close wound helical spring surrounded by one or more metal jackets. The spring is designed to have a specific compression resistance. During compression, the resulting specific pressure forces the jacket to yield and fill the flange imperfections while ensuring positive contact with the flange sealing faces. Each coil of the helical spring acts independently and allows the seal to conform to surface irregularities on the flange surface.

HELICOFLEX® design flexibility allows Technetics engineers to customize the seal characteristics to match each unique application.

Features & Benefits

  • Highest sealing level performance on the market, depending on the sealing load, the surface finish, and the surface treatment
  • Excellent corrosion resistance
  • Wide range of materials: from standard to specific and/or rare
  • Special materials on demand for coatings: wide range of materials available, from standard to specific and/or rare (see details below in “Specifications” section)
  • Extended lifetime and more
  • Excellent radiation resistance
  • Compatible with NACE MR 0175
  • Ø 4 to 8000 mm
  • Ø 1,5 to 40 mm cross-section
  • Adaptable to all types of sealing surfaces (triple faces, radial, shaped, and more)
  • Adaptable to all standards flanges (PNEUROP, ANSI, ISO, and more)

Product Applications

  • Nuclear: reactor pressure vessels, control rods, primary pumps, pressurizers, spent fuel casks, transportation casks
  • Valves: body/bonnet sealing, seat sealing
  • Oil and gas: hydraulics, subsea couplings, subsea Christmas trees, subsea compressors, electronic submersible pumps, flow meters
  • Life sciences: imaging & scanning systems
  • Ultra-high vacuum: accelerators & fusion research
  • Semiconductor chamber, exhaust and other applications in PVD/CVD/etch and lithography processes
  • Gas/chemical delivery systems
  • Automotive: engine, exhaust gas


Have questions? A Technetics Group product specialist will get back to you to shortly.