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Calculating PPM for bulk-type product

al40

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#1
I have a similar question: I have plastic sheets that we slit and then send out to our customers I'm having a hard time trying to figure out how to calculate PPM since these are not master rolls any ideals on how can I calculate the PPM on parts returned?

Thanks,
al40
 
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Miner

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#2
Although PPM in quality has typically been associated with physical parts or units, that is not a rule.

PPM may also be (area-nonconforming/total-area) * 1,000,000 or even (volume-nonconforming/total-volume) * 1,000,000.

Just make sure that the unit of measure is the same for the numerator and denominator, and that it makes sense for your product.
 
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