P1: general purpose boards for use in dry conditions.
P2: boards for interior fitments (including furniture) for use in dry conditions.
P3: non load-bearing boards for use in humid conditions
P4: load-bearing boards for use in dry conditions.
P5: load-bearing boards for use in humid conditions.
P6: heavy duty load-bearing boards for use in dry conditions.
P7: heavy duty load-bearing boards for use in humid conditions.