Mil and Micron Thickness in American Made Decals.
One of the most misconceived specification in the choice of decal and graphic material is thickness. Thickness in American made decals is most commonly measured in mils, and microns and millimeters in international manufacturing and other industries. These units are similar and yet very different in their measurements. Misleading them may result in poor selection of materials, performance, and wastage. The knowledge of mil, micron and millimeter thickness is useful in making sure that decals are used as desired in terms of endurance, elasticity and usability.
Thickness alone does not dictate quality but it affects handling, appearance, and its ability to work in a particular environment. Thickness is a practical guide when it is combined with the right type of material and adhesive system as opposed to a source of confusion.
The Thickness of Things in Decal Performance.
Thickness influences the behaviour of a decal during installation and its service life. The thicker films are usually more resistant to tearing and abrasion whereas the thin films can adhere well to curves and textured surfaces. A film with excessive thickness can creep on sides or bond on complex surfaces. A film of too thin a nature can stretch, wrinkle or tear up during application.
In the majority of cases decal is not a performance-defining coating but a performance-enhancing one. Adhesive chemistry, composition of the film, and exposure to the environment tend to have a more significant role. The next thing to consider is that the thickness is to be taken after choosing the right type of material.
Mil, Micron, and Millimeter Explained.
What Is a Mil?
One thousandth of an inch is known as a mil, which is abbreviated as 0.001 inch. This unit is standard in the United States in respect of pressure sensitive adhesive films like vinyl, polyester and adhesive transfer films. When a decal is said to be 3 mil or 4 mil it is only the thickness, not the strength or life span.
What Is a Micron?
One millimeter is one thousandth of a micron. One mil equals 25.4 microns. Microns are commonly used outside the US and are common in packaging, electronic, and protective film specifications.
What Is a Millimeter?
One millimeter is just under 0.394 inches. This causes it to be almost forty times thicker than a mil. The rigid signage boards and structural materials are done in millimeters instead of the flexible decal films. The use of mils instead of millimeters will most likely lead to the use of material that is much thicker and heavier than desired.
Standard Measurement Practices by Type of Material.
The categories of materials are based on the standard thickness measurements to ensure uniformity among the suppliers and uses of the materials.
Pressure Sensitive Adhesive Films.
Vinyl, polyester and adhesive transfer films are in mils. This incorporates cast vinyl, calendered vinyl and clear overlaminates in decals and labels.
Rigid Graphic Films
Mils are also used to specify thin rigid films like polycarbonate, polyester sheet, rigid PVC and aluminum when graphics or overlay work is to be done.
POP and POS Signage Boards
Measured in millimeters are expanded PVC, foam boards and composite panels. These are materials that are meant to be rigid and support structural and not on the surface.
Paper and Cardstock
The thickness of the paper is calculated in caliper points. A single caliper point is a thousandth of an inch, the same thickness as a mil. The points of caliper do not have anything to do with font size points.
Banner Materials
The thickness of banner is characterized by weight and not the actual thickness. A 13 ounce banner has weight of 13 ounces per square yard. Bigger banners are usually robust and sturdier.
Typical Thickness Ranges of Decal Materials.
Calendared vinyl is normally 3 to 4 mils and is applied in indoor signage and short term. Cast vinyl is thinner, typically about 2 mils, and is used where dimensional stability is required, such as outdoors and on complicated surfaces.
Pressure sensitive polyester films are approximately 2 mils and are chosen due to temperature resistance and chemical stability. Non adhesive films that are rigid including polycarbonate or polyester sheets are 5 to 30 mils in thickness depending on the intended use.
The expanded PVC signage boards are extremely thick and usually between 3-6 millimeters.
Is Durability Determined by Thickness?
The thickness is not the only factor that defines the longevity of a decal. More influential are material formulation and adhesive behavior. Thicker calendared vinyl does not perform well outdoors, and in such conditions, cast vinyl can be used, as it does not shrink and crack. Polyester films are also stable at high temperatures even when they are thin.
Abrasion resistance and rigidity can be gained with thicker materials but flexibility can be lost. Thinner boards are used in applications where weight is important, e.g. hanging signs. In high impact environments, wear can be absorbed by using laminated films of greater thickness.
The type of material to be used should always be chosen first before choosing the thickness.
Micron and Gauge Measurements in Allied Industries.
Thickness in packaging and protective film industries is commonly measured in micron or gauge. In some film manufacturing processes, gauge is a non standardized unit that is still in use. A gauge is about 100 and 25.4 microns or 1 mil.
Knowledge of such units comes in handy when decals are used together with protective films in the manufacturing process, transportation, or even installation.
Normal Film Thickness by Application.
The poly mailers normally vary between 2 to 3.5 mils based on the strength needs. Plastic shopping bags measure between 20 and 40 microns. Zipper and handle bags usually range between 35 to 90 microns. Shrink films are typically gauged.
Such comparisons can be used to show how thin decal films are in comparison to most of the consumer products made of plastic.
Thickness and Application Behavior.
Thickness influences the escape of air during application and bonding of adhesives to surfaces. Thinner films that have air release characteristics enable the trapped air to escape more readily. Thicker films can be harder to press and can be sensitive to alignment to prevent defects.
Preparation of surfaces and temperature also affect the results. Middle temperatures enhance the flow of adhesives. Dust, oil or moisture enhance the probability of failure irrespective of the thickness.
Selection of the Thickness.
The choice of thickness must not be made on guesses. Thin stable films are advantageous in outdoor decals. Medium thickness is an advantage of temporary signage as they are easier to handle. Structural signs demand millimeter sized materials in rigidity.
After the right material family is chosen, thickness is no longer a choice factor but a refinement.
Conclusion
The knowledge of mil, micron, and millimeter thickness is important when using the American manufactured decals and other graphic materials. These units characterize not quality but thickness, but have a strong impact on handling, appearance and performance. Mils are the best in decal specifications since they match thin and flexible films. Millimeters are part of the rigid signage and microns are used as an intermediate between international and packaging standards.
During the evaluation of thickness with the consideration of material chemistry, adhesive behavior, and environmental conditions, the choice of decal becomes more precise and predictable.
Frequently Asked Questions
What is the distinction between mil and millimeter?
One mile is 0.001 inch and one millimeter is 0.0394 inches. The thickness of a millimeter is almost forty times the thickness of a mil.
What is the reason why decals are measured in mils?
In the United States, the unit of measure of thin pressure sensitive film in decals is the mils.
Does this mean that thicker vinyl is always better?
No. Thicker vinyl can be stronger but it can decrease flexibility. Type of material is more significant than thickness.
Is it possible to convert microns to mils?
Yes. One mil equals 25.4 microns.
What is the standard thickness of outdoor decals?
The 2 mil cast vinyl is usually preferred as an outdoor decal because of its stability but not its thickness.
