GlassTomer™ Hermetic Sealing Technology
A Lightweight Alternative to Glass-to-Metal Seals
GlassTomer™ hermetic sealing technology is a proprietary solution developed and manufactured exclusively by Hermetron, engineered to deliver true hermetic sealing in demanding applications where traditional glass-sealed connectors fall short — especially when weight, material compatibility, or mechanical stress are limiting factors.
It achieves glass-level hermeticity — better than 1×10⁻⁸ cc He/sec — in a lightweight aluminum or stainless-steel package, with beryllium-copper contacts for high conductivity and durability.
When to Use GlassTomer™
GlassTomer™ is typically selected when traditional sealing methods reach their limits — particularly in lightweight, mechanically stressed, or vacuum-sensitive systems.
It is most often used when:
GlassTomer™ offers true hermetic sealing with mechanical compliance, making it ideal for complex and mission-critical assemblies in aerospace and defense applications.
How the GlassTomer™ Sealing Process Works
GlassTomer™’s performance advantages are directly tied to how the material is processed and cured — forming a compliant, vacuum-tight seal without the brittleness or material limitations of traditional rigid sealing methods.
The compound is cast and cured under controlled vacuum and thermal conditions, creating a continuous, gas-tight seal around internal conductors and interfaces. Unlike glass or ceramic seals, it maintains mechanical flexibility after curing, allowing it to absorb differential expansion and mechanical stress without compromising hermeticity.
GlassTomer™’s
Key Benefits
at Glance
Hermetic Sealing
Better than 1×10-8 cc He/sec
Lightweight Compatibility
Supports aluminum and lightweight housings
Mechanical Flexibility
Tolerates vibration and thermal cycling
Electrical Performance
Insulation resistance extremely high
Vacuum Suitability
Extremely low outgassing per NASA standards
Harsh Environment Use
Resistant to radiation, shock, aging, and more
Performance Specifications of GlassTomer™ Hermetic Sealing Technology
Hermeticity
Temperature Range
Electrical Properties
Environmental Resistance
Materials Compatibility
GlassTomer™ is compatible with a wide range of materials — including those that are difficult or impractical to seal using glass-to-metal techniques.
Housing Materials
Pin / Electrode Materials
Comparison with Other Hermetic Sealing Methods
| Characteristic | GlassTomer™ | Glass-to-Metal | Epoxy Potting |
|---|---|---|---|
| True hermeticity | Yes | Yes | No |
| Mechanical compliance | High | Low (rigid) | Medium |
| Aluminum compatibility | Yes | No | Yes |
| Thermal cycling resistance | High | Limited | Limited |
| Outgassing | Very low | Very low | Higher |
| Long-term vacuum use | Yes | Yes | No |
Applications in Aerospace and Defense
Originally developed for aerospace in 2014, GlassTomer™ has been used in over 100,000 units across critical aerospace and defense systems — with no reported sealing failures until now.
100K+
Units
delivered
10+
Years in field operation
Zero
filed failures reported
Engineering Support
GlassTomer™ is available as part of Hermetron’s custom hermetic solutions, from prototype to high-volume production. Our engineering team offers guidance to ensure optimal sealing performance across applications.
Services include:
Contact Hermetron Engineering to evaluate whether GlassTomer™ is the right fit for your assembly.
Explore Our GlassTomer™ Products
31-Pin D-Type Hermetic Connector
51-Pin Hermetic D-Type Connector
HN-Type Hermetic Coaxial Feedthrough
High-Voltage Hermetic Coaxial Feedthrough
Hermetic Power Connector
D-Type Connector
Epoxy-Sealed D-Type Connector
Looking to compare GlassTomer™ with other hermetic sealing approaches? Explore Hermetron’s full range of hermetic sealing technologies, including traditional glass-to-metal sealing solutions.