Five versions of SCHOTT Eternaloc® feedthroughs for energy applications shown on a grey background


Eternaloc® feedthroughs enable the transmission of electrical power and signals into and out of vacuum-tight assemblies. They provide long-term peace of mind for energy applications in challenging environments, including liquefied natural gas, compressed gas, nuclear power, submarines, and oil and gas equipment.
Man working on a SCHOTT Eternaloc® feedthrough

Safe and proven technology for energy applications

Eternaloc® feedthroughs and connectors protect safety-critical electrical infrastructure. This is especially important in potential severe accident scenarios that can include extreme temperature, pressure, thermal cycling, and shocks / vibration. SCHOTT’s unique compression glass-to-metal sealing has a proven track record and is seen as the safest technology available.

Female scientist examining an Eternaloc® feedthrough

Maintenance-free reliability reduces cost of ownership

Our electrical feedthroughs have delivered maintenance-free performance for decades, enabling reduced recalls and replacements, as well as lower total cost of ownership. This means both safer and more cost-efficient generation and transportation of energy.

Cutaway view of a SCHOTT Eternaloc® Liquefied Gas Terminal Header

Product variants

Nearly every Eternaloc® feedthrough, connector, and cable penetration is completely custom-made. What unifies the product family is the careful design of each component to reliably meet the challenging specifications of end-use applications.

SCHOTT Eternaloc® electrical penetration assembly for nuclear high temperature reactors
SCHOTT Eternaloc® lead-through plate for hydrogen gas-cooled generators
SCHOTT Eternaloc® feedthrough for oil and gas exploration
Nuclear-powered submarine on sea surface
Watch how nuclear power plants are becoming safer and more cost ef­ficient thanks to innovative components

We are certified

Eternaloc® feedthroughs are manufactured at a production site that is certified according to ISO 9001 / 14001, KTA 1401, ASME, ATEX & IECEx, and CE plus, amongst others.

Four cooling towers of a nuclear power plant next to a river with a pink and blue sky in the background
News & Innovation stories

Save and be safe

Small parts can have a big impact. This is especially true when it comes to nuclear energy. Plant constructors and operators alike must take every action possible to support safety and viability of nuclear reactors. This logic applies to all component selection in nuclear power. Durable, high-quality materials must be used to minimize degradation and maintenance – even for the smallest parts.

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Eternaloc® S-Type Terminal Header shown on a grey background

Half size. Double safety for LNG

Ultra-compact Eternaloc® S-Type Terminal Headers from SCHOTT now enable enhanced safety for small-scale LNG applications.

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Eternaloc® Electrical Penetration Assembly positioned on a table in a production environment

Electrical penetrations for high-temperature modular reactors

Chinergy Co., Ltd and Jiamusi Electric Machine Co., Ltd continue partnership with SCHOTT to supply safe and robust electrical penetration assemblies for new HTR-PM600 nuclear power project.

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Want to know more? Let's talk

Whether you need more information, samples, a quote, or advice for a project, I would be delighted to talk to you.

Get in touch
Ulrich Dirr, Head of Sales Eternaloc®
Ulrich Dirr

Head of Sales Eternaloc®