Definitions for "Microns"
A unit of length equalling one millionth of a metre or one thousandth of a millimetre.
Keywords:  rigors, mil, thicker, gauge, europe
In Europe many times referred to as "microns". 100 microns = 4 mil. Rigors of shipping in U.S. can sometimes be more severe and traditionally thicker gauge films have been used.
A measurement to indicate the thickness of paper as against grammage which is a measurement for weight only.