Official Journal of the Japan Wood Research Society
Table 5 Linear correlations for the total colour changes ΔE* between the artificial weathering in Xenotest (1–12 weeks) (x) and the natural weathering in an exterior (6–36 months) (y) testing 12 compositions in one series (n = 12), i.e. four tropical woods (kusia, bangkirai, massaranduba, jatobá) painted with three kinds of vegetable oils (transparent, teak, bangkirai)
Artificial weathering in Xenotest (weeks) | Natural weathering in an exterior (months) | Linear regression for ΔE* | Coefficient of determination R 2 |
|---|---|---|---|
1 | 6 | 1.03x + 8.04 | 0.28 |
12 | 1.37x + 10.22 | 0.24 | |
24 | 2.00x + 9.90 | 0.52 | |
36 | 0.88x + 19.88 | 0.27 | |
4 | 6 | 0.41x + 9.38 | 0.43 |
12 | 0.75x + 9.06 | 0.68 | |
24 | 0.58x + 15.73 | 0.41 | |
36 | −0.01x + 26.22 | 0.00 | |
8 | 6 | 0.30x + 8.78 | 0.36 |
12 | 0.57x + 7.64 | 0.60 | |
24 | 0.41x + 15.34 | 0.31 | |
36 | −0.01x + 26.24 | 0.00 | |
12 | 6 | 0.26x + 8.74 | 0.30 |
12 | 0.51x + 6.99 | 0.55 | |
24 | 0.33x + 15.76 | 0.23 | |
36 | −0.01x + 26.50 | 0.00 |