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 conditionsP4: 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.
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