This standard BS EN 975-2:2004 Sawn timber. Appearance grading of hardwoods is classified in these ICS categories:
79.040 Wood, sawlogs and sawn timber
This standard defines appearance grades for European poplars The standard applies to dry and green sawn timber , of thickness 18mm up to 34 mm and of width 100mm up to 250mm measured in a green state.. This standard does not apply to the strength grading of structural timber.