FAQ – a selection of the most frequently asked questions:

Mechanical Engineering

Do run ceramic bearings even at temperatures above 500°C?
Yes! Gehrig® zirconia ceramic bearings achieve maximum operating temperatures of up to 850°C degrees.
Gehrig® Silicon Nitride Ceramic Bearings even maximum operating temperatures of up to 1500°C degrees.
There is a need for Si3N4-ceramic bearing to calculate the installation fits in the high temperature application exactly.

What load ceramic bearings do stand?
Gehrig® bearings made from zirconium oxide ceramic theoretically achieve the same dynamic load rating values such as steel.
For bearings of silicon nitride ceramic the static load rating reduces itself in the area of value by usually 30-50%.
In practice ceramic bearings made of ZrO2 and Si3N4 in comparison achieve a higher load values and a longer service life.

Are Gehrig® ceramic bearings corrosion resistant?
Yes. Technical Ceramics is very stable, robust and sluggish. Gehrig® ceramic bearings are used in many aggressive acids
and alkaline liquid application. Gehrig® ceramic bearings are usually very good corrosion resistant
and well suited for salt and sea water applications.

Can Ceramic bearing cold weld?
No. This phenomenon is mainly in the case of metallic roller bearings and workpieces of the same material already at room temperature.
For metallic rolling bearing rings you can prevent cold welding through the use of ceramic Si3N4-rolling body or ZrO2-rolling body
(Gehrig® Hybrid bearings)!

Can ceramic bearings run dry?
Yes. It still applies to different parameters.

Food industry

Can ceramic bearings be used even with aggressive cleaning agents?
Yes. Gehrig® ceramic bearings are used in many aggressive, acidic and basic media and ambient conditions apply.
Rolling bearings from technical ceramics are sluggish in reaction, very robust and easy to clean.

Are ceramic bearings FDA-compatible?
Yes. Many ceramics are very good biocompatible and are used in the medical technology and food technology.
On request we will be pleased to make an appropriate confirmation available.


Offshore Technology

Do ceramic bearings rust or corrode in salt water?
No. Gehrig® ceramic bearings cannot rust, are usually very good corrosion resistant and well suited for salt and sea water applications.
By its very density and hardness ceramic is insensitive even against salt crystals.

How robust are rolling-contact bearings of technical ceramics in the dynamic and static load capacities?
Gehrig® ceramic bearings made of ZrO2 zirconium oxide generally achieve the same dynamic and static load capacities such as steel bearings. In practice they show more robust at higher loads. They are more corrosion resistant and temperature resistant than steel bearings
and have also further more interesting positive characteristics. For Rolling bearings from Si3N4 the theoretical value in the case of static load ratings reduces by 30-50%. Nevertheless the very hard and broken tough Si3N4-ceramic, especially as rolling body material, provides an above-average performance in comparison with steel.

High Technology Applications

Are ceramic bearings made from zirconium oxide ZrO2-ceramic magnetic?
No, zirconium oxide ZrO2-ceramic is non-magnetic.

What kind of bearings are electrically insulating?
Gehrig® hybrid bearings and ceramic bearings are usually of nature from electrically insulating.

Are ceramic bearings vacuum suitable?
Yes. Gehrig® full ceramic bearing with rings, balls and cage made of technical ceramics are vacuum compatible.
By clear geometries in the rolling body components (cage) you can reach high vacuum.

Combined Requirements

You have problems to find a suitable deep groove ball bearings for our application?
You are looking for a robust bearings for high temperatures, aggressive media and high speeds?
You look for a solution? Please contact us!