Official Journal of the Japan Wood Research Society
Grade | Clear part of surface (%) | Note (visual standard) |
---|---|---|
3 | > 90 | Extremely clear, no defects detected in visual inspection |
2 | 60–90 | Almost clear but some defects detected |
1 | 30–60 | Some serious defects on limited area of surface |
0 | 0–30 | Significant serious defects detected on wide area of surface |