The digits refer to the tell WRAS, the approval holder and others the year and month of approval as well as, in the last three digits, which test laboratory undertook the testing and whether it was an early audit for a re-approval.
Material approval numbers are created in a similar way with the 'YY MM XXX' format and can most readily be distinguished by having the number '5' as the fifth figure in the approval number.
See the diagram below which shows how the numbering system works for Approved Products.
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