Monomeric or Polymeric Vinyl, or Cast? Which Film for Which Job

Three white rolls of vinyl lie side by side on the workshop table. From the outside, identical. You only see the difference after a few winters on a façade, or at the first curve where an edge starts to lift again.

If you want to know whether monomeric or polymeric vinyl is the right one, the words trip you up first. For self-adhesive PVC films, “monomeric” and “polymeric” describe the plasticiser inside the film. The third type, cast vinyl, differs in how it is made in the first place.

The information comes from the film manufacturers' data sheets and application guidelines, even where this isn't stated separately. For your project, what counts is the data sheet of the film that actually goes on the surface.

Monomeric or polymeric vinyl? The difference in brief

Monomeric and polymeric vinyl are both rolled. The basic version contains a monomeric plasticiser, the higher-grade version a polymeric one. Polymeric vinyl lasts longer outdoors and is easier to apply to gently curved surfaces. Cast vinyl is made differently, hardly shrinks and conforms even to complex shapes.

Indoors, for promotions or on flat surfaces, the basic grade is often exactly right.

Rolled or cast: how self-adhesive films are made

Calendered vinyl, also called rolled vinyl, is drawn through heated rollers. This is how both monomeric and polymeric films are made. Calendered vinyl is cheaper than cast.

For cast vinyl, a liquid PVC mixture is poured out flat onto a carrier and dried in an oven until the solvent has evaporated. It is considered lower in tension and more dimensionally stable than calendered vinyl.

This becomes measurable in shrinkage. One large manufacturer tests its films in the laboratory using the FINAT TM 14 method, applied to aluminium. Its data sheet gives up to 0.4 mm in the machine direction for its calendered films, whether basic or partly polymeric grade, and up to 0.1 mm for the cast film, a quarter of that. The values apply to the test sample, not to a whole sign. Even cast vinyl is not entirely free of shrinkage.

When it comes to thickness, the individual product decides. Calendered cutting films are often around 0.07 mm, calendered print films around 0.10 mm. Cast films range from 0.05 to 0.11 mm. The thick ones are multi-layer films for full wraps.

According to the data sheet, cast vinyl can hardly be stretched further before breaking than calendered vinyl from the same manufacturer. The reason it still goes into a channel is heat: with heat it can be shaped and then largely stays in shape, while calendered vinyl shrinks more. Shaping with heat belongs in experienced hands.

What monomeric and polymeric mean for vinyl

The plasticiser decides whether a calendered film belongs to the basic or the higher-grade version. With a monomeric plasticiser it is called monomeric vinyl, with a polymeric one, polymeric vinyl.

Monomeric and polymeric are fixed material classes used by film manufacturers for print films, cutting films and protective laminates. Depending on the class, the printer even needs different settings.

Some manufacturers offer a partly polymeric film in between. It is intended for short- and medium-term outdoor lettering and, according to the manufacturer, lasts a very long time indoors. What “partly polymeric” means chemically is not stated in the data sheets we know of. The application details in the data sheet are what count.

One manufacturer gives the same temperature range for its calendered and its cast film, from −40 °C to +60 °C, briefly up to +80 °C. Chemicals are a different story. According to manufacturers, premium cast films are more resistant. The data sheet of one such film lists, for example, oils, greases, fuels, weak acids, salts and alkalis.

The three film types compared

Feature	Monomeric vinyl	Polymeric vinyl	Cast vinyl
Manufacture	rolled (calendered)	rolled (calendered)	cast from liquid, dried in an oven
Thickness	calendered: depends on the product, often around 0.07 mm (cutting film) to 0.10 mm (print film)		depends on the product, 0.05 to 0.11 mm
Shrinkage (one manufacturer's example)	up to 0.4 mm machine direction	partly polymeric: up to 0.4 mm machine direction; fully polymeric: see data sheet	up to 0.1 mm machine direction
Surface	flat	flat to gently curved	also curves, channels, complex shapes
Outdoor durability per data sheet	around 3 to 4 years	partly polymeric 3 to 5 years, polymeric up to around 7 years	5 to 12 years, depending on colour
Typical use	indoors, trade shows, promotions; outdoors short to medium term on flat surfaces	long-term outdoor lettering	vehicles, architecture, long service life

The years are manufacturer figures, usually for permanent-adhesive, unprinted film applied vertically in a Central European climate. They are best-case values, not a promise for every façade.

Monomeric vinyl: for short-term applications and flat surfaces

Monomeric vinyl is suitable for indoor use, for example shop decoration and trade shows. It also copes with short- to medium-term outdoor applications, as long as the surface is flat. Use cast vinyl for a window promotion and you pay for an advantage nobody sees.

Our standard sticker is meant to last a long time outdoors too. That's why we don't print it on monomeric but on polymeric vinyl with a permanent adhesive.

Polymeric vinyl: for medium- to long-term applications

According to one manufacturer, polymeric vinyl lasts up to around seven years unprinted and applied vertically, and is intended for long-term outdoor applications. It is easier to apply to gently corrugated or curved surfaces than monomeric vinyl. Typical examples: lettering on a façade, or the sign at the driveway entrance that is meant to hang there for years.

Cast vinyl: for curved surfaces and a long service life

Cast vinyl conforms even to complex surfaces. That's why it is used for vehicles and in architecture. Because it hardly shrinks, it is less likely to lift out of recesses, off curves and at the edges.

For vehicles with channels, rivets or pronounced curves, and for full vehicle wraps, manufacturers recommend cast vinyl, often with air-release channels in the adhesive. Calendered vinyl is intended for flat and gently curved surfaces and does not belong in deep channels. You'll find more on company vehicles under Vehicle graphics.

Film and laminate: does the combination fit?

Printed stickers can be given a protective laminate. According to manufacturers, it protects the digital print against UV radiation and abrasion. Laminates come in the same three classes as the films.

One manufacturer's application guidelines are clear on this. Laminate and print film should come from the same manufacturer and belong to the same class, so monomeric on monomeric and polymeric on polymeric, because the raw materials are matched to each other. And applying the laminate under tension distorts the film assembly.

Our standard sticker is polymeric on polymeric: film and protective laminate come from the same class. If you ask for a cast version, it is best to raise the laminate at the same time. Whether your design is printed or plotted from coloured vinyl is covered in the article Foil technology or digital print?

Which film for which purpose: a decision guide

Use	Film type	What to watch
Discount promotion in the shop window	monomeric	When the promotion ends, a removable adhesive makes removal easier
Trade show stand or event	monomeric	For the duration of a trade show, the basic grade is usually enough
Interior lettering in an office or shop	monomeric	If it needs to come off at some point, order it removable
Sign on the workshop, flat, meant to last for years	polymeric	According to manufacturers, film lasts longer applied vertically than horizontally
Toolbox or machine exposed to oil and grease	cast, depending on agent and substrate	State the plastic of the case and the specific oils, cleaners and fuels; resistance is listed in the data sheet
Company vehicle, flat door without channels	polymeric	Calendered vinyl is only intended for flat to gently curved surfaces
Vehicle with channels and curves	cast	Discuss shape and use beforehand
Outdoor advertising campaign with a fixed end date	monomeric, polymeric for longer runs	State the duration and orientation; the manufacturer durability figures depend on them

The application guidelines give an explicit warning: if you use a film type that is not suitable for the surface, expect a considerably shorter service life.

The film type governs shape and service life. Whether a sticker holds on powder coating or difficult plastics is a question of the adhesive and a topic of its own. Further points to consider before ordering are covered in Stickers you can't overlook and in Stickers must meet specific requirements.

An inn's autumn promotion: two surfaces, two film classes

A typical case: an inn is planning an autumn promotion. The stickers for it go on the inside of the shop window and should come off again after a few weeks. The driveway entrance also needs a new sign, flat and vertical, meant to hang outdoors for years.

For the window, monomeric vinyl with a removable adhesive is enough, because the promotion has a fixed end. The sign outside gets polymeric vinyl, because it lasts longer outdoors than the basic grade.

Neither job needs cast vinyl; both surfaces are flat. If the delivery van with its body channels came along later, the choice would look different.

Why we won't talk monomeric vinyl down

The company has existed since 2017, our founder has been in the trade for more than 30 years, and in all that time there has only been one honest answer to the question of which film class is best: every film class has its place. The only wrong film is the one in the wrong place.

Cast vinyl for a promotional sticker that comes off again after a few weeks costs more and achieves nothing. Monomeric vinyl on a curve that is supposed to last for years brings trouble. We would rather spot either before printing than after.

So the order is: first location and duration, then the material. You'll find more on vinyl lettering under Foil technology and on outdoor signs under Signage.

Conclusion: which film class goes where

Monomeric vinyl suits indoor use, promotions and flat surfaces with a foreseeable end. Choose polymeric vinyl if lettering needs to last longer outdoors or the surface is gently curved. Cast vinyl pays off on curves, channels and for a long service life. These four questions belong before every order:

• Duration: How long should the sticker last?
• Shape: Is the surface flat or curved?
• Location: Will it be applied indoors or outdoors, vertically or horizontally?
• Method: Will the design be printed or plotted?

Order custom stickers online at koeck-print.at. If the right type of film isn't available in the configurator, write to us via Contact and tell us where and for how long the sticker needs to stick.

Frequently asked questions

What is the difference between monomeric and polymeric vinyl?

Both films are calendered, that is, rolled. The basic version contains a monomeric plasticiser, the higher-grade version a polymeric one. According to manufacturers, polymeric vinyl lasts longer outdoors and is easier to apply to gently curved surfaces. Monomeric vinyl suits indoor use and flat surfaces where the end date is foreseeable.

When do I need cast vinyl?

As soon as the surface is strongly curved or has channels and the lettering needs to last a long time, for example for a full vehicle wrap. Cast vinyl hardly shrinks and conforms even to complex shapes. On a flat surface with a short service life, it usually brings no advantage.

Is monomeric vinyl also suitable for outdoor use?

Yes, according to manufacturers, for short- to medium-term outdoor applications as long as the surface is flat. For permanent-adhesive, unprinted basic film outdoors, data sheets state around three to four years, applied vertically in a Central European climate. If the lettering needs to last longer or the surface is curved, polymeric or cast vinyl is the better choice.