Product Details Supplier Info More products
Download document:

MCPs, Merkel Counter Surface Parameters - .PDF file.

A concept for the sustained assessment of sliding surfaces based on Merkel Counter Surface Parameters (MCPs) takes into account the specific requirements involved in hard-soft contacts.

Seal counterfaces have usually been assessed on the basis of parameters for metal-to-metal contacts.

However, as a piston and rod seal in hydraulic systems always involves a hard-soft contact, the result obtained for counter-surface assessment in terms of abrasivity, long-term behaviour and oil deposits provides restricted information.

This is leading to greater friction and more rapid wear of the sealing elements in tribological systems.

With MCPs, surface profiles are registered according to the tried-and-tested contact-stylus process.

This is the first time, however, that the parameters relevant for hard-soft contacts are derived from the Abbott Firestone curve.

The parameters defined therein – core peak-to-valley height Rk, peak height Rpk, Rpkx and groove depth Rvk, Rvkx – make it possible to obtain an accurate description of surfaces as seal counterfaces.

As a result, essential properties of the surface topography can now be determined with accuracy in the field of sealing technology.

These include the peaks being responsible for abrasive properties and wear potential; the profile core governing long-term behaviour; and the recesses influencing the conveyance of media – as leaks and/or hydrodynamic lubricating film.

Click the download links for more information on this article.

FTL Seals Technology

FTL Technology continues to enhance its image as a supplier of sealing, bearing and engineered solutions. Our desire to provide this type of solution underpins our entire Company’s work, values and beliefs; however these brand values are sometimes a little difficult to articulate.


Often customer’s opinions regarding credibility and ability to perform, can only be formed during their experience of dealing with our Company. If you have an apparently insolvable sealing or bearing problem, rather than simply provide a replacement part, we will consult with you and aim to deliver an ‘Engineered Solution’.

View full profile