What is mil?

Mil or Thou is a unit of length which equals one thousandth of an inch. The thickness of different materials in U.S is measured in mils. The thickness of ID cards is about 30 mils.

It is important to differentiate between mill and millimeter which is 0.001 meter.

The following examples can help you to totally understand the size of mil:

  • A grocery store bag is 0.5 mil
  • A dry cleaning bag is 0.75 mil
  • A freezer bags is generally 1.75 mils
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