1 Types of Gutters and How to Prepare for an Install. 2  Advice on Gutters and Downspouts. 3  Tips for Cleaning and Repairing Gutters.  Outdoor Spring Maintenance Tips.
One mil is 1/000th of an inch. A sheet of paper is 4/1000ths of an inch thick, so 10 mil has the thickness of 2 1/2 sheets of paper. A mil is not to be confused with a millimeter(mm). On average human hair is 100 microns or .004 inches. 10 mil is the width of about 2 and a half human hairs.
The average diameter of human hair is roughly 0.0035 inches in diameter, which is equivalent to 75 microns. The micron is symbolized by the Greek lowercase letter mu.. The abbreviation micron was initially used to distinguish the units of a tool used to measure small distances, also called a micrometer.