# On the Use of Silicon Rubber Replica for Surface Topography Studies

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## Abstract

Silicone rubber is often used to obtain replica of surfaces which are hard to study directly. Here we discuss under what conditions engineering stylus measurements can be used to obtain the correct surface roughness from the replica. We also show how thin vertical slices of the silicone rubber can be used to obtain the surface roughness power spectra for the long-wavelength roughness on even very rough surfaces, such as road surfaces, which may be hard to probe directly with standard optical or stylus instruments.

## Keywords

Rubber replica Silicone rubber Surface roughness power spectrum Stick-slip## Notes

### Acknowledgements

We thank J.R. Barber, R. Bennewitz, S.N. Gorb, L. Pastewka, M. Scaraggi, N. Spencer, and R.A. Sauer for useful comments on the manuscript.

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