Maya Ellison
When it comes to measuring the thickness of plastic sheeting, the term mil is commonly used. A mil is equivalent to one-thousandth of an inch (0.001 inches or 0.0254 millimeters). This unit of measurement is not to be confused with a millimeter, which is a different unit of measurement. The thickness of plastic film is often expressed in gauge, mils, and microns, with thicker plastic sheeting used for vapor barriers, greenhouse films, and heavy-duty containment liners. The mil thickness of a plastic sheeting product can affect its durability and weight, so it is important to consult professionals to determine the appropriate thickness for a specific project.
| Characteristics | Values |
|---|---|
| What is a 'mil'? | One-thousandth of an inch (0.001 inches or 0.0254 millimeters) |
| Mil vs. millimeter | Mil is not the same as a millimeter (1 mil = 0.0254 mm) |
| Mil thickness range | Plastic sheeting can be as thin as 1 mil or as thick as 120 mils |
| Mil thickness and durability | The mil thickness of a plastic sheeting product affects its durability and weight |
| Mil thickness and applications | The term "heavy-duty plastic" depends on the application; a thicker mil sheet is required for landfill lining than for protecting a desk from dust |
| Mil thickness and scrim reinforcement | The mil thickness of plastic sheeting with scrim reinforcement can vary due to the reinforcement adding durability and tear resistance |
| Measuring mil thickness | Micrometers and digital calipers are the most accurate tools for measuring mil thickness |
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What You'll Learn
Mil vs. millimetre
In the plastics industry, the thickness of plastic film is often expressed in gauge, mils, and microns. A "mil" is distinct from a millimetre, despite the similarity in their names. A mil is equivalent to one-thousandth of an inch (0.001 inch or 0.0254 millimetres), whereas a millimetre is almost 40 times thicker than that, or about 0.0394 inches. Thus, 1 mil is equal to 0.0254 mm, and 1 mm is equal to 39.37 mil.
The term "mil" comes from the Latin "mille", meaning thousand. The thickness of plastic film is often expressed in gauge, which is equal to 100 x mils. For instance, 0.005 inches (or 500 gauge) of plastic is the same as 5 mils. A piece of copier paper is about 0.004 inches or 4 mils thick.
The use of mils and millimetres depends on the material being measured. Pressure-sensitive adhesive-backed films like vinyl and polyester, along with transfer adhesives, are measured in mils. Polycarbonate, polyester, rigid PVC, and aluminium also use mils for thickness callouts. On the other hand, the thickness of signage materials, including expanded PVC (aka Celtec or Sintra), Gatorfoam, and Maxmetal, are all measured in millimetres.
The term "heavy-duty plastic" depends on the application. For example, a 6-mil sheet might be strong enough to protect a desk from dust but too weak for landfill lining. Thicker plastic sheeting (e.g. 6 to 20+ mils) is used for vapor barriers, greenhouse films, and heavy-duty containment liners.
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Mil vs. micron
The thickness of plastic film is often expressed in gauge, mils, and microns. A "mil" is 1/1000th of an inch, which is equal to 0.0254 mm or 25.4 micrometres. This unit of measurement is used in the United States and is sometimes confused with millimetres by people outside of the US. Mil measurements specify the thickness of plastic sheeting used in construction for vapor barriers or temporary enclosures. For instance, a 6-mil sheet might be used to protect a desk from dust, while thicker plastic sheeting (e.g., 6 to 20+ mils) is used for heavy-duty applications such as landfill lining.
A micron, or micrometer, is a metric unit of length equal to one-millionth of a meter (0.000001 meter) or one-thousandth of a millimetre (0.001 mm). Micron measurements provide a high degree of precision, which is especially valuable in industries requiring exact specifications, such as medical packaging. For example, precise micron measurements are necessary to ensure sterility for medical products. In the food industry, micron thickness impacts the shelf life and freshness of food products by influencing the barrier against moisture and oxygen.
Understanding how to convert between mil and micron is crucial for global businesses operating with both imperial and metric systems. To convert mils to microns, multiply the number of mils by 25.4. For example, a plastic film with a thickness of 50 microns is equal to approximately 1.97 mils (50 microns divided by 25.4 microns per mil).
Laminated plastics usually have a minimum thickness of 2 mils (50.8 micrometres) but can range from 2 to 5.5 mils for commercial applications. Some Mil-Spec packaging materials can be as thick as 10 or 20 mils. In the food sector, plastic films typically range from 20 to 80 microns (0.8 to 3.1 mils), depending on the specific product requirements.
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Mil thickness and durability
The thickness of plastic film is typically expressed in gauge, mils, and microns. A "mil" is 1/1000th of an inch, equivalent to 0.0254 mm or 25.4 microns. This unit of measurement is derived from the Latin "mille," meaning "thousand," and is commonly used in manufacturing.
While thicker plastic sheeting generally offers increased durability, it is important to consider the specific application and requirements. For instance, a 6-mil plastic sheet may be sufficient for protecting a desk from dust but inadequate for landfill lining. The intended use, environmental conditions, weight capacity, and chemical resistance all influence the required thickness and material composition.
In industrial applications, thicker plastic sheeting, ranging from 6 to 20+ mils, is often used for vapor barriers, greenhouse films, and heavy-duty containment liners. The presence of scrim reinforcement, a woven or non-woven grid, can also enhance durability and tear resistance. Additionally, additives like UV inhibitors can be incorporated to prevent degradation in plastic exposed to sunlight.
The thickness of plastic sheeting can be measured using a digital caliper, although measurements may vary with the presence of scrim reinforcement. When considering the optimal thickness for a specific application, it is crucial to balance factors such as material, performance, and budget.
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Tools for measuring mil thickness
The thickness of plastic film is typically expressed in gauge, mils, and microns. A "mil" is 1/1000th of an inch, or 0.0254 mm. SolveTech, for instance, offers thickness-gauging technology for measuring plastic film.
There are various tools available for measuring mil thickness. A digital caliper, for instance, is commonly used to measure the thickness of plastic sheeting. However, it's important to note that measurements can vary if the plastic contains scrim reinforcement, which is a woven or non-woven grid added to enhance strength. When measured over the scrim, the reading will be thicker than in areas without it.
Coating thickness gauges, or mil gauges, can also be used to measure the thickness of coatings on plastic, composites, metal, and other materials. These gauges provide measurements in mils and are available in different models, such as the MiniTest and PenTest series. Some gauges offer features like Bluetooth connectivity and long-lasting battery life.
Prismatic Powders offers a mil thickness gauge specifically designed for measuring coatings on metals, including ferrous metals like cast iron and non-ferrous metals like aluminum. This tool ensures accurate measurements for an even finish.
Online resources, such as the Plastic Film Thickness Chart and Unit Conversion Calculator provided by Grafix Plastics and Global Plastic Sheeting, can also help with converting between different units of thickness measurements, including mils, gauge, microns, and inches.
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Converting mils to gauge
The thickness of plastic film is typically expressed in gauge, mils, and microns. A "mil" is 1/1000th of an inch, or 0.0254 mm, and is distinct from a millimetre. Gauge is equal to (100) x (mils). Therefore, to convert mils to gauge, you can use the formula: gauge = 100 x mils. For example, 0.3 mils = 30 gauge.
The relationship between gauge and mils varies depending on the material. For instance, in plastic films, 100 gauge equals 1 mil, whereas in metal foils, 1,000 gauge equals 1 mil. It is important to consult material-specific charts for accurate conversions.
In industrial settings, plastic liners used for waste containment require specific thicknesses to handle different loads. For example, a 6-mil-thick sheet is strong enough to protect a desk from dust but too weak for landfill lining. In this context, accurate conversions between gauge, mils, and microns are crucial for compliance and product integrity.
There are several tools available to assist with conversions, such as the SolveTech Plastic Gauge Thickness Chart & Calculator, which offers a comprehensive conversion table and calculator tailored for plastic films. Other resources include the Omni Calculator, UnitConverters.net, and Phoenix Wrappers Conversion Tools, which cater to various applications and units of measurement.
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Frequently asked questions
A "mil" is a unit of measurement that is equivalent to one-thousandth of an inch. This is not to be confused with a millimetre, which is different from a "mil". A copier paper is about 4 mils thick, while a grocery store plastic bag is about 0.5 mils thick.
Micrometers and digital calipers are the most accurate tools for measuring the thickness of plastic sheeting. These devices provide precise readings in mils, millimetres, or inches, depending on their settings.
The thickness of plastic sheeting can affect its durability and weight. For instance, a 6-mil sheet might be strong enough to protect a desk from dust but too weak for landfill lining. Thicker plastic sheeting, such as 6 to 20+ mils, is used for vapour barriers, greenhouse films, and heavy-duty containment liners.
