Technical Glass,
also known as Industrial Glass, Special Glass, or Functional Glass

C-Glass (Chemical-resistant glass) is an alkali-borosilicate glass developed for applications with high chemical stress, particularly from aggressive acids and corrosive media. It belongs to the family of glass fibers and is predominantly used in glass fiber-reinforced plastics (GRP) as well as in filter, insulation, and protection systems. The letter C stands for the central property of this material: Chemical Resistance.

C-Glass is used wherever conventional glass fibers—such as E-Glass—reach their limits. Especially in permanent contact with chemically aggressive environments, e.g., in acidic industrial atmospheres, it remains dimensionally stable, resistant, and durable over the long term.
A practical example is its use in filter housings of exhaust gas purification systems, where standard glass fibers are damaged over time by continuous exposure to acidic vapors. C-Glass prevents material failure, preserves the structural integrity of the components, and significantly extends the service life of the systems.

E-Glass (short for Electrical Glass) is an alkali-free alumino-borosilicate glass originally developed for applications with high demands on electrical insulation. Today, it is the most widely used type of glass fiber worldwide and plays a central role in the production of glass fiber-reinforced plastics (GRP).

In addition to its electrical insulation properties, E-Glass impresses with good mechanical strength, temperature resistance up to approx. 500°C, and comparatively easy processing. Due to its favorable material costs, it is particularly economical and is preferred in many industrial sectors.

Typical applications include the rotor blades of wind turbines, printed circuit boards in electronics, vehicle components made of GRP, heat-resistant insulation materials, and reinforcing fabrics for facades and concrete components. The versatility and availability of E-Glass make it a standard material for technical fiber applications where electrical insulation and structural reinforcement are required.

Borosilicate glass is a high-temperature-resistant, chemically extremely stable special glass characterized by a high proportion of silicon dioxide (SiO₂) and boric anhydride (B₂O₃). It is one of the highest-performing materials in the field of technical glass applications and is used wherever extreme conditions prevail – for example, in laboratory equipment, reactors, viewing windows of furnaces, technical piping systems, or optical components.

Borosilicate glass for tableware and container glass:
The composition of technical borosilicate glass differs significantly from the variants used in tableware or container glass. The boron content is usually higher (sometimes over 12%) to achieve maximum chemical resistance and thermal resilience. In return, the glass is more difficult to shape and significantly more expensive to produce.

It is resistant to thermal shock, corrosion-resistant to acids and alkalis (except hydrofluoric acid), transparent, and mechanically stable over the long term – ideal for industry, research, medical technology, and chemical processes.

Neutral glass is a specialized borosilicate glass known for its high chemical resistance, especially to aqueous solutions, acids, and alkalis. It is called “neutral” because it hardly reacts chemically with its contents – neither releasing nor absorbing substances – and thus does not interact with stored substances. This neutrality makes it particularly suitable for sensitive or pharmaceutical applications.

Its main area of application is in the pharmaceutical industry, e.g., for ampoules, injection vials, infusion containers, and laboratory vessels in which medications are stored, transported, or processed. Neutral glass generally meets the requirements of hydrolytic class 1 according to ISO 720, which is the highest classification for chemical resistance.

Thanks to its thermal stability and chemical inertness, neutral glass is considered a reliable material wherever absolute material purity and substance insensitivity are required – especially in sensitive applications in medicine, biotechnology, and chemical analysis.

Sodium silicate glass, also known as water glass or soda-silicate glass, is a glass with a high proportion of sodium oxide (Na₂O) and silicon dioxide (SiO₂). It is one of the simplest and most cost-effective types of glass and belongs to the group of alkaline silicate glasses. However, compared to borosilicate or neutral glass, it has lower chemical resistance, especially to water and acids, as sodium ions can be leached out relatively easily.

Due to its good formability, transparency, and inexpensive production, sodium silicate glass is used for everyday applications where high chemical or thermal resistance is not required. Typical areas of use include window glass, container glass (e.g., bottles, jars), disposable containers, and household glass products.

In industry, water-soluble sodium silicate (liquid water glass) is also used as an adhesive, sealant, or binder in refractory materials, cement, and detergents.

Display glass is a special technical glass developed specifically for use in screens and electronic display systems. It is characterized by high optical quality, mechanical strength, scratch resistance, and in many cases, a particularly low thickness. Display glasses are often made of alkali-free aluminosilicate glasses. These are characterized by their strength, chemical stability, and good compatibility with electronic components.

A well-known example is Gorilla® Glass, a chemically strengthened glass that is made extremely resistant to mechanical stress and scratches through ion exchange. Other variants include Dragontrail™, Xensation™, or Sapphire Glass in premium devices.

Display glass is used in smartphones, tablets, notebooks, touchscreens, televisions, as well as in automotive displays, industrial panels, and wearables. Depending on the application, it is often additionally coated (e.g., anti-reflective, anti-glare, oleophobic, or antibacterial).

Due to its properties of transparency, stability, and functionality, display glass is an indispensable material in modern electronics.

Glass-ceramic is a crystallized technical glass created through controlled heat treatment of specific glass compositions. Unlike conventional glass, glass-ceramic consists of a fine-crystalline microstructure embedded in a glassy matrix. This special structure gives the material exceptionally high thermal shock resistance, low thermal expansion, and mechanical strength.

Glass-ceramics can withstand sudden temperature changes of several hundred degrees without cracking – ideal for applications where heat and cold alternate rapidly. The best-known brands are, for example, Ceran® (for cooktops) or ZERODUR® (for precision optics and telescopes).

Typical applications include cooktops, viewing windows in ovens, fireplace glass, laboratory equipment, optical components, and technology components in aerospace.

Through the interplay of heat-resistant functionality and high dimensional stability, glass-ceramics are an indispensable material in high-temperature and precision applications.

Technical glass is used wherever conventional glass or other materials reach their limits. Due to its specific material properties – such as heat resistance, chemical resistance, electrical insulation, or optical clarity – it has become indispensable in numerous industries.

In electronics, it is used for displays, touchscreens, sensor covers, and printed circuit board substrates. In medical and laboratory technology, it serves as a material for test tubes, ampoules, or diagnostic devices where absolute purity is required.

Industry uses technical glass for piping systems, reactors, or sight glasses, as it is resistant to aggressive substances. It also finds application in the automotive industry, e.g., in headlights, HUDs, or displays.

In the field of energy and environmental technology, technical glass is used in photovoltaic modules, solar thermal systems, and insulating materials.
Its versatility makes technical glass a key material in modern technology.

In many industrial applications, technical glass offers decisive advantages over materials such as plastic, metal, or ceramic. Especially where chemical resistance, heat tolerance, optical clarity, or electrical insulation are required, technical glass is often the superior choice.

• Excellent temperature resistance: depending on the glass type, resistant to over 1000 °C (e.g., quartz glass, glass-ceramic).
• High chemical resistance: e.g., against acids, solvents, or gases (C-glass, borosilicate, neutral glass).
• Electrical insulation capability: ideal for electronics and high-voltage technology (E-glass, display glass).
• Dimensional accuracy and form stability: no creeping or deforming like with plastics.
• Optical properties – high transparency, UV or IR permeability depending on the glass type.
• Aging and UV resistance: does not yellow, does not become brittle under UV radiation.
• Surface finishing possible: scratch-resistant, anti-reflective, antibacterial, conductive.

Technical glass is not a substitute for everything, but it is an indispensable material when stability under extreme conditions, chemical inertness, or functional transparency is required. Its strengths come to the fore where other materials reach their physical or chemical limits.