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Pull force is the highest possible holding power of a magnet. Measured in kilograms, the pull force indicates how much weight the magnet can hold when adhered against 10mm thick mild steel with flat and direct surface-to-surface contact.
GSM is a measurement of the weight of paper or card rather than a measurement of thickness, therefore it is not applicable to apply the same formula to magnetic paper to calculate the GSM as you would traditional mediums.