A “mil” is 1/1000th of an inch. This can sometimes mean a millimeter to people outside of the United States, so don't get confused! Gauge is (100) x (mils)...
Common Kraft Paper Weights & Thickness ; 60 GSM. 0.8 MM - 0.85 MM. 2.75 - 3.35 mil. 70 - 85 um ; 70 GSM. 0.8 MM- 0.10 MM. 3.1 mil - 4.7 mil. 80 - 95um.
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