Custom Engineered Metal Seals

Bostec specializes in solving the most complex UHV sealing problems. Our method is to study the situation either on-site or in our Force Testing Laboratory, determine an appropriate solution based on environmental conditions, temperature cycling, mating materials, comparative CTEs and so forth. That generally leads to production of a small number of prototypes which are then laboratory and field tested for final iterations. Production volumes are then manufactured.

Problems We Solve

  • Need to replace elastomeric seals with metal
  • Reduce footprint
  • Reduce force
  • Achieve higher vacuum levels
  • Leakage problems due to CTEs
  • Multi-sided


  • Small footprint
  • Low force
  • Small dead volume


  • Adapts to Marmon and chain-clamp flanges
  • Shoulder designs are self-p…


  • Replaces low-reliability spring-energized seals
  • Reduced forcebility


  • Small footprint
  • Low force
  • Small dead volume
Bostec Custom Precision UHV Metal Seals
Conflat (CF) Gaskets


HiRim® Technology
100% Reliable — Money back guarantee

Exotic Materials

Wide range of materials to match flange and gasket CTEs for high temp baking.

Extensive Product Scope: In developing a custom engineered solution, we draw from the four basic categories of metal seals we manufacture and utilize a range of exotic and special metals ideal for extreme UHV. Our seals types all derive from H-Seals, which we developed and patented in the late 1990’s. We continue to refine H-Seal technology and have many variations, which are proprietary.

Based On Research We recently completed a six-month evaluation program to measure force and penetration values of our seals as well as our competitor’s designs. Our goal was to understand the full range of metal sealing options available, and catalog their relevant design parameters for comparison. We currently have the most comprehensive database in existence of force and performance data covering all basic metal seal designs. For the purposes of designing complex new super-UHV seals for nuclear, outer space or other extreme conditions, our data is invaluable.

Particle Acccelerators

Nuclear Power



Let us know if you have special needs not covered by our catalog parts. We are always ready to work with you to address your most challenging UHV or UHP projects.