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  1. 01-25-2013, 09:41 AM #2
    Neil Miller
    Neil Miller is offline
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    The 'P' is a European (ISO) standard. The other is the American (CAMI) standard. The lower grits - 220 and under - are more or less the same in both ranges, but the similarity begins to drift in the mid and high grit ranges - see this table.

    Regards,
    Neil
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