Machine elements for use in cleanroom conditions

Schaeffler UK offers a range of rolling bearings, linear guidance systems, direct drives and lubricants for use in cleanroom environments.

By working closely with independent research institutes, Schaeffler's industrial laboratories are able to classify the company's bearings, linear guidance systems and lubricants for cleanroom environments, certified for particle emissions according to ISO 14644-1.

Extensive analysis is carried out on these products, including outgassing behaviour, electrostatic discharge (ESD) and mechanical efficiency.

Most of the analysis is performed in cooperation with the Fraunhofer Institute based in Stuttgart, Germany.

Measurements are carried out on Schaeffler products in cleanrooms according to ISO class 1.

This involves maintaining a displacement flow with low vertical turbulence under consistent operating conditions.

John Loonam, linear product specialist at Schaeffler UK, said: 'Whereas cleanrooms themselves are classified according to international specifications based on airborne particulate concentration, machine elements such as rolling bearings and linear guides do not have their own air volume or air supply system, and so are not organised into cleanroom classes.

'Measurement of particle emission is therefore used to determine the cleanroom suitability of machine elements.

'However, such measurements are not covered by international standards.

'The method used at Schaeffler is extremely thorough and measures particle emissions over a fixed period at positions with the highest particle emission,' he added.

Schaeffler's range of monorail guidance systems includes linear recirculating ball bearing units that are available in two-, four- and six-row versions.

All metal parts can be made from corrosion-resistant martensitic steel.

The customer can also choose units with a very low magnetic permeability.

Where robust construction is required, the customer can specify end pieces that are made from corrosion-resistant steel, which provides resistance to gamma radiation and is suitable for use in vacuum and cleanroom applications.

Schaeffler also offers a range of lubricants that are suitable for use in linear guidance systems and rolling bearing cleanroom applications.

Based on a synthetic oil and polyurea thickener, Schaeffler claims its Arcanol Clean M multi-purpose grease offers lower particle emissions in linear guides and rolling bearings compared to standard grease.

Arcanol Clean M is also suitable for moderate vacuum conditions and enables longer service intervals and reduced maintenance of guides and bearings, added the company.

Back to top