Q:

What is MIL thickness?

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Quick Answer

"Mil thickness" refers to a U.S. engineering unit of measurement that is equal to 0.001 inch. Engineers and manufacturers use mil to rate the thickness of various items, including plastic, paper, sheet metal and aluminum foil.

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Full Answer

The most common size of plastic sheeting is 6 mil, which is 0.006 inch. Plastic sheeting also comes in 1 mil, 2 mil, 3 mil, 6 mil and 10 mil. Thick, heavy plastic is 12 mil to 80 mil. Copper sheets come in varying thicknesses, including 1 mil, 1.4 mil, 3 mil, 5 mil and 10 mil. Heavier copper sheets are 16 mil and 22 mil. Standard-duty aluminum foil is between 0.4 mil and 0.7 mil or 0.0004 inch and 0.0007 inch. Heavy-duty aluminum foil is 0.8 mil to 1 mil.

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