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What is mil thickness?

Published in Unit Measurement 2 mins read

Mil thickness is a measurement commonly used in manufacturing to specify the thickness of materials. A mil is a unit of measurement equal to one thousandth of an inch (0.001 inch).

Understanding Mil Thickness

Essentially, mil thickness provides a standardized way to express very small dimensions, particularly for thin films, coatings, and other industrial materials. This avoids the use of fractions or multiple decimals when precision is crucial.

Mil to Inches Conversion

To convert from mils to inches, you simply divide the mil measurement by 1000. Here's the formula and a table of examples:

Formula: Inches = Mil / 1000

Mil Thickness Inch Equivalent
1 mil 0.001 inch
5 mil 0.005 inch
10 mil 0.010 inch
20 mil 0.020 inch

Practical Examples:

  • Plastic Sheeting: Often measured in mils, with common thicknesses ranging from 1 mil to 10 mils for various applications like plastic bags and construction films.
  • Coatings: Paint, varnishes, and other coatings frequently use mil thickness to ensure consistent application and performance.
  • Adhesive Tapes: The thickness of adhesive layers is also commonly specified in mils.
  • Flexible Materials: Mil thickness is used to describe the thinness of flexible substrates used in various industrial applications.

Why Use Mil?

  • Precision: Mil provides a precise measurement for very thin materials, allowing for clear specifications.
  • Standardization: Using mils helps to maintain consistency across manufacturing processes.
  • Clarity: It avoids the use of many zeros after the decimal when expressing small thickness, making it easier to understand and specify.