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Pool Liner Thickness: Gauge vs. Mil

What's the difference? What does it mean in inches or mm?

30 mil liner vinyl measured by digital calipers

Finding the right pool liner for your pool can be difficult enough without have to worry about the thickness of the material (vinyl) that is being used. Most pool professionals can't even tell you the official difference between vinyl gauge and mil measurements. What's worse, the unit "gauge" doesn't always mean the same thing from one industry to the next. For example, when measuring items like wire, shotgun barrels, sheet metal, and hypodermic needles, the thickness or diameter increases as the gauge decreases (they are inversely proportionate). While for sheet vinyl, used for pool liners, and photographic film, the thickness or width of the material increases as the gauge increases (they are directly proportional).

Luckily, all you have to worry about right now is vinyl gauge and mil as they relate to pool liners. For your convienence and better understanding, Ameri-Brand has researched mil and gauge standards and compiled information from manufacturers across the vinyl industry. The table below shows a side-by-side comparison of mil and gauge sizes that are commonly used for vinyl pool liners. You will also see the "average thickness" of these materials in the standard measuring units of inches and millimeters. You may be suprised to learn that each of these common liner thicknesses is thinner than a small piece of American coinage, the dime.

Common Liner Units Liner Thickness (avg.)*
Mil Gauge inches mm
- 30 0.0260 0.6604
- 25 0.0223 0.5652
- 20 0.0185 0.4699
20 - 0.0205 0.5207
30 - 0.0275 0.6985
40 - 0.0405 1.0287
Dime (for comparison) 0.0490 1.2446

*Averages based on multiple measurements, taken from vinyl samples provided by multiple pool liner manufactures and vinyl suppliers. Digital calipers (shown above) were used to take all measurements.

 
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We hope this page on Above-Ground Pool Liners has provided you with some beneficial information.


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