AI : Natural, untreated wood without any contamination
AII : Glued, painted, coated, lacquered or otherwise treated wood without organic halogens and wood preservatives.
AIII : Wood with organic halogens in the coating but without wood preservatives
AIV : Impregnated wood and wood treated with wood preservatives
The document linked below provides examples of the assignment of waste wood to the various waste wood classes.
Waste wood classes with examples (PDF 712 KB)