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Molybdenum glass melting electrodes.
Our champions in your field of expertise.

Glass melting electrodes must withstand extremely high temperatures and aggressive glass melts. Molybdenum from PLANSEE is the right material for these challenging conditions.

Melting point of 2 620 °C (4 748 °F)
Outstanding creep resistance
High dimensional stability
Excellent corrosion resistance
Good electrical and thermal conductivity
Outstanding purity

Quality.
Our unbreakable rule.

When it comes to quality, we like to be in complete control. We produce our molybdenum glass melting electrodes ourselves – from the metal powder right through to the finished product.

As our input material, we use only the purest molybdenum oxide. In this way, we can be sure that our glass melting electrodes are free of any impurities. This prevents any discoloration or bubble formation. Thanks to a special forging process, the glass melting electrodes we manufacture possess a particularly smooth surface. In addition, our forming processes result in a particularly coarse-grained, creep-resistant material structure coupled with optimum straightness. The benefit to you: Your glass melting electrodes do not become deformed, are less prone to wear and last for longer.

Guaranteed quality from PLANSEE


Raw material (oxide)	Reduction	Metal powder	Mixing	Pressing	Sintering	Forming	Heat treatment	Machining Joining Coating	Quality assurance

MoZrO₂: Outstanding corrosion resistance.

PLANSEE employee during the production of glass melting electrodes

PLANSEE supplies glass melting electrodes made from MoZrO₂ for glass production involving particularly aggressive glass melts. Small quantities of zirconium oxide (ZrO₂) added to molybdenum enhance the properties of the pure material. MoZrO₂ offers a particularly high level of corrosion resistance to glass melts as well as better creep resistance than pure molybdenum.

Major areas of application for MoZrO₂ include glass production for the solar industry and container glass industry. The solar glass production process makes use of aggressive refining agents such as antimony oxide. These harm the grain structure of pure molybdenum and cause the rapid abrasion and breakage of the electrodes. MoZrO₂ is able to withstand this aggressive environment. Even in brown and green container glass, MoZrO₂ is able to considerably reduce electrode corrosion.

Our guarantee against oxidation: SIBOR®.

Let us be completely honest. Do you know the Achilles heel of our molybdenum? Oxygen. Because the material oxidizes at temperatures over 400 °C (752 °F).

In the past, did you solve the problem of glass melting electrodes by installing them in the tank already full of glass melt – a time-consuming and hazardous operation? If that is the case, try SIBOR® - our anti-oxidation solution for molybdenum - and mount your electrodes simply and easily before heating the glass tank. SIBOR® protects molybdenum against oxidation at temperatures up to 1 700 °C (3 092 °F). The very hard, dense coating creates a diffusion barrier along the base material and forms an SiO₂ seal against the air.

SIBOR: Our oxidation protection for molybdenum

SIBOR®-coated molybdenum glass melting electrodes can be heated rapidly without causing the coating to separate. The oxidation protection is guaranteed to remain effective for the following periods:

5000 h at 1 250 °C / 2 282 °F
500 h at 1 450 °C / 2 642 °F
50 h at 1 600 °C / 2 912 °F

Stock product or tailor made.

Only flawless, chemically cleansed electrodes leave our factory. And we can even supply standard sizes from stock. However, special requirements are also not a problem. Special dimensions, mechanically processed, coated, with special threads or cooling holes? Tell us your requirements.

Sure and certain.

Since 1921, our customers have been able to rely on PLANSEE as an independent private company. For our customers and for us, reliability and continuity is particularly important when it comes to the supply of raw materials. With Global Tungsten & Powders (GTP) and its interest in Molibdenos y Metales (Molymet), the Plansee Group covers every step of the molybdenum and tungsten processing – from powder production through powder-metallurgical processes to serving customers with semi-finished and tailor-made components.

What else can we do for you?

What else can we do for you? Get to know the other champions for your glass melting tank: Molybdenum tank reinforcements for protection against corrosion, stirrers and gobbers, our products for quartz glass production and spinning nozzles for the manufacture of glass and ceramic wool and glass fibers.

Tank cladding

Why wait? Our ribbons, sheets, rods and wires manufactured from refractory metals are available for order online right now. Take a look: www.plansee-express.com

Set us a challenge!

No job is too tough for our metals. Tell us what you want us to do. We're here for you — worldwide. Just choose your country and get to know our glass manufacturing specialists in person.