Precision Metal Seals for UHV / XHV
Bostec designs, prototypes, tests, validates and manufactures complete metal sealing systems for failure-intolerant UHV / XHV applications.
- FUSION / FISSION
- SPACE
- SEMICONDUCTOR
- MEDICAL
- WEAPONS
We understand why conventional sealing approaches often fail.
Bostec combines proprietary seal design, real-world manufacturability, and deep understanding of force, materials, and UHV/XHV behavior.
By integrating our specialized lab/testing capability, we close the loop between concept and proof.
Submit your designs and specs
Bostec helps turn ambitious physics into reliable machines
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Quantum Computing
Trapping matter at the edge of physics and persuading it to calculate before reality interferes.
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Space
Throwing a precision instrument through an explosion and expecting it to work forever afterward.
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Fusion
Holding a star together long enough to steal some of its fire.
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Semiconductor
Manufacturing structures smaller than bacteria while demanding factory yields large enough to make money
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Fission
Convincing unstable matter to fall apart in an orderly and profitable way.
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Weapons
Persuasion backed by physics.
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Why Bostec?
Our End-To-End Capabilities
Customized Solutions — Prototype to Production
Compact, lightweight solutions crafted with precision and ingenuity.
Small Footprint — Low Force
We focus on minimizing footprint and required force while maximizing sealing reliability — balancing mechanical performance with system-level constraints
World's Only UHV & Force Testing Lab
We test your hardware—flanges, housings, and assemblies—with our seals under bake, cryogenic, vibration, seismic, and shock conditions. The result: validated UHV performance before you ever build the real system. No guesswork. Just proof.
Matched Sets
If needed, we manufacture both seals and flanges in-house, providing matched sets that guarantee ultra-high vacuum and high-pressure reliability.
From Exotic Materials To Integration
Our capabilities span machining of demanding alloys such as nickel, titanium, and niobium, as well as the integration of sealing solutions into complex beamline systems.
World’s Largest Selection of Off-The-Shelf CF gaskets
46 stock sizes, CF 1 to CF20, ASTM standard or DN sizes. OFS Copper, annealed pure Nickel, pure Aluminum
Trusted for over 30 years
Bostec Engineering has delivered no-fail sealing solutions in the most demanding environments where failure is not an option.
Single-Source Supplier In The U.S. And EU
Customers rely on us as a direct partner for high-performance sealing components across critical vacuum and pressure applications.
For decades, Bostec has built its reputation on designing, testing, manufacturing and delivering metal seals that never leak.
Customers come to us with sealing systems that are too large, too force-hungry, or too unreliable.
We re-engineer those problems into elegant solutions:
- WCompact Footprints
- WManageable Closure Forces
- WGuaranteed Leak-free Performance
proprietary technologies developed by bostec
Our 5 Basic Seal Families
CF Gaskets
A radically improved CF gasket
Available In Stock
45 sizes from CF1 to CF20
Offered in superior HiRim® or flat configuration
Precision machined so they fit properly
Fully annealed • 100% reliability
Copper, Nickel, Aluminum
Guaranteed 1 x 10-11 leak rate
Technical Information — Part No Specifications — How to Order
XE-Seals®
Drop-in replacement for C-Seals
Custom Sizes & Specs
from .5″ to 60″
XE Seals® are 100% Reliable
Precision machined so they fit properly
No change to your gland
Drop-in Replacement for C-Seals
Copper, Nickel, Aluminum, Titanium
Technical Information — Part No Specifications — How to Order
H-Seals®
The world’s most reliable knife-edge seal
Custom Sizes & Specs
from .5″ to 60″
Low compression force
guaranteed 1 x 10-11 leak rate
100% RELIABLE
Shoulder Seals
Compact, self-protecting seals
Custom Sizes & Specs
from .5″ to 60″
100% RELIABLE
Shoulder protects seal from damage
Perfect for tight, damage prone areas
Multi-Sided Seals
When round won’t fit
Custom Sizes & Specs
from .5″ to 60″
Space Efficient
Conforms to your shape
Available in XE or H-Seal
Bring us your most challenging seal problem!
OUR PROCESS
Depending on your project, we may ask for used samples of your flanges and seals for analysis.
To design the right metal seal, we need to see how your parts behave—surface finishes, crush depth, gland depth, closure force, and available geometries. Once we review your form and talk through your goals, we’ll let you know which parts to send.
From there, we test your hardware—flanges, housings, and assemblies—with our seals under bake, cryogenic, vibration, seismic, and shock conditions. Bostec runs the world’s only UHV & Force Testing Lab dedicated to customer hardware.
This means we prove performance before you ever build the real system.
No guesswork. Just proof.
Available in a Variety of Exotic Materials
We are the experts in nickel and titanium!
Always Precision Machined — ALL CTE MATCHING
Submit your designs and specs
A Trusted Partner
Where We Work
Particle Acccelerators
Nuclear Power
Outerspace
Oilfield
Aerospace
Optics
Semiconductor
Semiconductor
Oil and Energy
Optics
Medical
Particle Accelerators
Nuclear Fusion
Aerospace
Outer Space
