Molybdenum stirrers and tappets for glass production

Molybdenum is used to manufacture the components for glass production. Stirrers are used for homogenization and tappets (plungers) are used for portioning glass melts. They must be able to withstand extremely high temperatures and corrosive glass melts. Our products are ideally suited to these challenging conditions.

Your advantages at a glance:

High melting point of 2620°C
Excellent creep behavior
Good dimensional stability
Excellent corrosion resistance
Good electrical and thermal conductivity
High purity

We produce stirrers from molybdenum and coat these with Al₂O₃ for the processing of particularly high-grade types of glass for optical components. The stirrers are then platinized by our partners in the platinum industry.

Partially platinized molybdenum stirrers

Molybdenum is extremely corrosion-resistant. During the homogenization of borosilicate glass- and opal glass melts, molybdenum performs well, even in direct comparison with the glass melt. We developed our partially platinized stirrers for exactly this purpose. Only the stirrer shaft outside the glass melt is protected against oxidation by means of a platinum sleeve.

Fully platinized molybdenum stirrers

Fully platinized stirrers are used if stringent purity requirements exist for the end product during the processing of particularly corrosive types of glass. With its high creep resistance and high-temperature stability, molybdenum provides the necessary mechanical stability. The soft platinum cladding provides optimum corrosion protection.

Advantages of metal stirrers compared with ceramic stirrers:

Better stirring action thanks to unlimited design possibilities
Small shaft diameter and large blade diameter for more effective stirring
Higher mechanical stability
Better thermal shock resistance
No contamination of the glass melt
Considerably longer service life

We provide the following to suit your application:

Homogenization-, spiral-, and portioning stirrers
Dosing- and spiral tappets (plungers)
Semifinished products for stirrer production
Products to meet your specific requirements:
optionally available with ceramic diffusion barrier coatings and platinum sheathing