Technical Consulting
METAL FUSED SIGHT GLASSES FOR EXTREME CONDITIONS

Not all sight glasses are created equal – With METAGLAS® you can prevent total failures before they even occur.

Designed for high‒pressure applications involving pressures of several hundred bar and temperatures up to 300 °C.
While conventional sight glasses can fail suddenly if damaged, METAGLAS® remains reliably stable even under extreme conditions.
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The Risks of Standard Sight Glasses

That is why conventional sight glasses pose a risk in critical applications

Sudden failure due to unsuitable sight glasses

Under high pressure and temperature conditions, thermally tempered sight glasses can often fail suddenly and without warning—with direct consequences for safety, equipment, and processes.

High maintenance costs and unnecessary downtime

Sight glasses that are difficult to clean or replace significantly increase maintenance requirements and lead to longer downtime and higher operating costs.

No reliable insight into critical processes

If processes are not clearly and consistently visible, deviations often go unnoticed and their causes are difficult to trace, which makes decision-making uncertain.

Increasing requirements due to standards and regulations

Without reliable process monitoring, it becomes difficult to reliably meet the requirements of ISO, FDA, or internal standards—posing potential risks to operations and compliance.
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Used in critical industrial processes

Industries that cannot compromise on safety

METAGLAS® is the top choice wherever processes are critical and downtime is costly.
Laboratory equipment: beakers, Erlenmeyer flasks, and a pipette containing liquid on a table.
Chemical and pharmaceutical industry
A nuclear power plant with four smoking cooling towers and a reactor unit set against green fields under a clear sky.
Energy sector
Two wind turbines in green fields under a blue sky, surrounded by forest.
Wind energy
Three round dials with “TURN KEY RIGHT” and “Mosler” lettering on an antique machine.
Measurement and Control Technology
An industrial complex with large white silos; one of them has “lesieur” written on it in green and brown.
Petrochemicals
A worker is kneeling in front of large silver machines in a factory with shiny floors and pipes.
Food industry
A long assembly line in a large, modern factory with blue-tinted lights.
High-pressure and vacuum applications
Black-and-white photograph of complex industrial machinery with numerous pipes, valves, and cables.
And many other industries...
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The technical basis of METAGLAS®

METAGLAS® prevents what standard glass cannot

METAGLAS® is not clamped in the traditional way, but is permanently fused to metal. This creates a stable bond with permanent compression within the glass—designed for applications with high demands in terms of pressure, temperature, and stress.
Metal-fused construction
Glass and metal are permanently bonded together to form a particularly sturdy unit for demanding applications.
Constant compression in the glass
The permanent compressive stress increases the glass's resistance to stress and external influences.
A secure connection under load
The connection remains stable even under pressure, temperature fluctuations, and mechanical stress.
Custom designs for various applications
METAGLAS® solutions are precisely tailored to the installation situation, the medium, and the technical requirements.
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Laboratory equipment: beakers, Erlenmeyer flasks, and a pipette containing liquid on a table.

The difference becomes apparent in an emergency

METAGLAS® vs. Conventional Sight Glasses

Under normal operating conditions, many sight glasses serve their purpose. However, under real-world conditions such as pressure, temperature, and stress, significant differences become apparent.

Conventional sight glasses

Loses stability immediately if damaged
Susceptible to scratches, pressure, and stress
Can fail suddenly and without warning
Only suitable to a limited extent for extreme conditions
Frequent replacement and increased maintenance costs
Continuous compression ensures maximum stability
High resistance to pressure and stress
No sudden total failure – damage remains manageable
Designed for extreme pressure and temperature conditions
Durable, low-maintenance, and versatile
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A single, round, clear eyeglass lens stands upright against a light blue background.

For applications with lower requirements

When a standard solution is sufficient for your application

Many of our customers are specifically looking for standard sight glasses and already have a clear idea of how they will be used.
If the requirements for pressure, temperature, or load are lower, a standard sight glass can be a suitable and cost-effective solution.
That is why we offer both options—tailored to your needs. On our homepage, you will find a selection of standard sight glasses and compatible components—including the option to submit a direct inquiry.
Our standard sight glasses

Here's how the collaboration works

4 Clear Steps to Finding the Right Sight Glass

Every application is different. That’s why we guide you every step of the way – from the initial assessment to the finished, ready-to-use solution.
01
A businessman is on the phone at his desk, with a notebook and laptop in front of him.
Step 1

Inquiry & Initial Technical Assessment

Please describe your application and requirements to us. We will review the operating conditions and provide you with an initial technical assessment.
02
Two engineers are examining a metal component using blueprints, with a laptop in the background.
Step 2

Consulting & Custom Solutions

Together, we will develop a solution that is perfectly tailored to your installation environment and process requirements.
03
A man in a blue shirt compares a technical drawing on paper with a 3D model on a computer monitor.
Step 3

Design & Detailed Quote

You will receive all relevant technical specifications and drawings, as well as a transparent, no-obligation quote.
04
Two large, shiny stainless steel containers with round lids and black handles in an industrial facility.
Step 4

Manufacturing & Reliable Operation

Once approved, we will develop your solution and ensure its reliable, long-lasting integration into your process.
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With a global presence

Global representatives for METAGLAS® solutions

International sales partners and technical representatives ensure that METAGLAS® solutions are available worldwide and supported by professional service.
South America
United Kingdom, Ireland
Visilume logo featuring a blue circle and two white diagonal lines; below it, “VISION IN PROCESS.”
Singapore
The logo features the letters “BC” inside a blue, rounded rectangle, with the text “BEAVER CONTROMATIC” in blue lettering next to it.
Italy
The word “Pohling” in black with orange squares, and “TECHNICAL SOLUTIONS” in all caps below it.
Denmark
The logo features the text “OEM AUTOMATIC KLITSCH” in black lettering with a black diamond symbol on the left.
Australia, New Zealand
Atomic model with a red nucleus and three gray electrons in blue orbits
CMC Technologies Pty Ltd.
France
Atomic model with a red nucleus and three gray electrons in blue orbits. The logo featuring the text “Gallet Equipements Industriels” in black lettering on a white background.
India
A blue “EDGE” logo above “SOLUTIONS” in gray lettering on a white background.
Poland
A blue and a red arrow line wind in an S-shape; the blue one points up and to the right, and the red one points down and to the left.
Korea
Logo of Michaelis Korea Co., Ltd., featuring a stylized burner and the letters “MKL TB.”
Taiwan
Silhouette of a black cat with its tail extended against a gray square background.
Passetto Enterprise
A modern two-story office building with a glass facade, parking spaces, and three trees in the foreground against a clear sky.

Experience you can count on

About Us – Herberts Industrieglas GmbH & Co. KG

For over 40 years, Herberts Industrieglas has been developing solutions for applications where safety, durability, and reliability are critical.
Our metal-fused sight glasses are used worldwide in demanding industrial processes—anywhere standard solutions reach their limits.
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Meet us in person

Upcoming Trade Shows & Industry Events

METAGLAS® regularly participates in international trade shows and industry events—to facilitate technical exchanges, explore new applications, and engage in face-to-face discussions with customers, partners, and prospective clients.
Advertising banner for Valve World Expo Düsseldorf 2026: “MAKE YOUR BUSINESS FLOW,” December 1–3, 2026, Düsseldorf, Germany.

Valve World Expo

International Trade Fair for Industrial Valve Technology and Process Solutions.

DIAM & DDM

Trade fair for industrial valves, sealing technology, actuators and accessories
LOUNGES, CLEANROOM PHARMA PROCESSES, March 16–18, 2027, Karlsruhe Exhibition Center, The international industry event.

Lounges Cleanroom Processes

An international industry event focused on cleanroom and pharmaceutical processes.

MEORGA MCR Solution Fair

Trade fair for measurement, control, regulation and automation technology.
GMP-Pharma Congress, April 20–21, 2027, in Wiesbaden, Germany: The 29th Conference and Expo on Pharmaceutical Manufacturing & Technology.

GMP PharmaTechnica

Trade Show for Pharmaceutical Manufacturing & Technology.

MEORGA MCR Solution Fair

Trade fair for measurement, control, regulation and automation technology.
ACHEMA 2027 logo featuring a three-tiered pyramid in green, blue, and red; June 14–18, 2027, Frankfurt am Main, www.achema.de.

ACHEMA 2027

The leading international trade fair for the chemical, pharmaceutical, and process industries.
The largest national trade event for industrial valves and sealing technology, November 17–18, 2027, at the Jahrhunderthalle in Bochum.

Industrial Valves & Sealing Technology

Germany's largest trade event for industrial valves and sealing technology.

FAQ

Frequently Asked Questions

For which pressure and temperature ranges is METAGLAS® suitable?
Can METAGLAS® be customized to fit our system?
How does the collaboration work in practice?
Is the consultation really non-binding?
How soon will we receive a response?
What sets METAGLAS® apart from conventional sight glasses?
Can you handle small orders as well?

Find out which solution is truly right for your process

Pressure, temperature, and installation conditions place different demands on the sight glass. We’ll assess your application and show you which model will perform reliably—before failures or unnecessary risks occur.
Request technical advice now