Hello Paul,

what I've found about the Fichtel & Sachs RE ...
 Apex Seals are made of IKA3 from Goetze in Germany (now part of
Federal-Mogul)

    special gray cast iron ("Grauguss") with C 3,6%, Si 2,8%, Mn 0,8%
    HRC 40

Trochoid was layered with Nicasil (= Elnisil, Galnical ...)
    NiSiC
    HRC 54

Side Housings were cast of "uebereutektischem AlSi"
    I try to explain it: ~ material contents more Si then needed for
homogeneous mixture + the Si accumulates at the surface as wear surface (or
something like that ...)

The Toyota SAE paper I talked about is the No 790435 (at
http://papers.sae.org/) - but I don't have it + it's about Light Load only
...

At last perhaps useful or interesting ...
a big paper by Mathieu Picard at MIT  ~ 60 MB, 357 pages, PDF file
"Development of Multiscale Models for the Performance of the Gas + Oil Seals
in Rotary Engines"

To big to send it, but you can find it with the help of Bing or Google or
...

For better results you can add   filetype:pdf   to your search string ...

This document is about Mazda Renesis oil seals + apex seals + side seals -
still not perfect ...


With kindest regards

Frank (Herfert)


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