Grammage Test
The mass per area of the paper is measured as gsm (grams per square meter). Paper sheets are cut to a size of 10 cm x 10 cm, then the sheets are massed individually. The mean of the masses is used to calculate the mass of the paper per square meter, and the standard deviation is determined from all samples. If the mass is higher than specified, it is a loss for the publisher.
Read more about this topic: Paper And Ink Testing
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