Table 3. Results of experiment in relation to Manufacture state, Time, and Material type for the ISO 25178 parameters.
| ISO 25178 Parameters | Results | ||
|---|---|---|---|
| Manufacture [Man] |
Time [Time] |
Material [Mat] |
|
| Arithmetic mean height [Sa] |
Sa:Man UW: low GS: mid SF: high |
Sa:Time declines with use for FS; no clear trend for PL and DB |
Sa:Mat FS: low PL: high DB: high |
| Autocorrelation length [Sal] |
Sal:Man UW: low GS: mid SF: high |
Sal:Time no clear trend |
Sal:Mat no clear differences |
| Arithmetic mean peak curvature [Spc] |
Spc:Man UW: low GS: mid SF: high |
Spc:Time declines with use |
Spc:Mat FS: low PL: mid DB: mid |
| Upper material ratio [Smr1] |
Smr1:Man UW: low GS: high SF: mid |
Smr1:Time increases with use for FS; no clear trend for PL and DB |
Smr1:Mat FS: high PL and DB variably lower |
Boxes outlined in bold include results that differ from predictions. UW: unworked, GS: ground with sandstone, SF: scraped with flint, FS: fresh skin, PL: processed leather, DB: dry bark.