Gauge is a term used to describe thickness. Film thickness is no longer the standard for judging plastic can liner strength. Advanced resins and additives have allowed manufacturers to produce thinner, lighter can liners that are stronger than thicker trash can liners made from lesser-quality materials. Linear Low-Density Can Liners (LLD) are measured by mil thickness; High-Density Can Liners (HD) are calculated by Micron thickness. Mil - (one-thousandth of an inch) - One mil equals .001". Can liners range between .35 to 4.0 mils Micron - 25.4 microns equals .001". One thousand microns (M) is 1mm. Can liner thickness can range between 5 to 24 microns.