The Differences Between Polyurethane and Vinyl Films

Many of the heat transfer vinyls  are not vinyl at all. Much of what is sold today is polyurethane or a polyurethane blend. Learn the differences in Jim Hingst's article.

Many in our industry use the all-encompassing term “heat transfer vinyl” to refer to any heat transfer flex film.  The fact of the matter is that many of the heat transfer films on the market today are not vinyl at all. Much of what is sold today is polyurethane or a polyurethane blend.

The reason that I make this distinction is that there is a big difference between polyurethane and vinyl films.  What’s more, a 100% polyurethane film is also quite different than a polyurethane-based blended film. Let me explain the differences.

Polyurethane films are very soft and stretchable. There’s a reason for this. Polyurethane is comprised of very long molecular chains, which provide it with elasticity.  By comparison, vinyl is composed of molecules which are very rigid. 

100% polyurethane heat transfer films are much more elastic than plasticized vinyl films.

To make vinyl films more elastic, plasticizers are added to the formulation. Plasticizers are oils which can leach out of the film, every time the garment is washed. As the plasticizing oils leach out of the vinyl they can cause allergic reactions.  Plasticizers have also been linked to other medical issues, which is why some plasticizers have been banned under the Consumer Product Safety Improvement Act (CPSIA) for use in the manufacture of children’s garments.

As plasticizers leach out of a vinyl, the film increasingly becomes more rigid and brittle. Eventually, appliques manufactured from vinyl heat transfer films will crack.

Polyurethane films do not need plasticizers to make them stretchable. These films are naturally elastic. That’s why appliques made from polyurethane heat transfer films retain their flexibility and provide long-term service life. In fact, if garments are washed and dried properly, polyurethane appliques should last as long as the garment itself.  

Compared to vinyl heat transfer films, polyurethane films provide other desirable performance properties. Polyurethane is also more abrasion resistant than vinyl, which makes it ideal for punishing athletic applications. Used to decorate performance fabrics, polyurethane films provide the elongation and memory, allowing the appliques to stretch as the fabric stretches.

Caveat emptor

Be aware that not all formulations of polyurethane films are the same.  SEF is a leading manufacturer of flex and flock films. All of these SEF flex films  are 100% polyurethane, Many other competitive products are classified as “polyurethane based”.  These polyurethane based films are blends of polyurethane and vinyl. Because these blends contain PVC, they may not be CPSIA or OekoTex Standard 100 compliant.

With the addition of vinyl to their formulations, polyurethane-based films are also typically stiffer, less elastic and not so durable as 100% polyurethane.

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Shopping for a Heat Press 

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For More Information About SEF Americas:

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Ordering: sales@SEFamericas.com

Web: NEW SEF Americas Website

Click Here: SEF Americas Shared Public Folder

Click Here: SEF Product Application Guide

Click Here: SEF FlexCut Product Color Guide

Click Here: SEF Print & Cut Product Guide

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About Jim Hingst: After fourteen years as Business Development Manager at RTape, Jim Hingst retired. He was involved in many facets of the company’s business, including marketing, sales, product development and technical service.

Hingst began his career 42 years ago in the graphic arts field creating and producing advertising and promotional materials for a large test equipment manufacturer.  Working for offset printers, large format screen printers, vinyl film manufacturers, and application tape companies, his experience included estimating, production planning, purchasing and production art, as well as sales and marketing. In his capacity as a salesman, Hingst was recognized with numerous sales achievement awards.

Drawing on his experience in production and as graphics installation subcontractor, Hingst provided the industry with practical advice, publishing more than 150 articles for  publications, such as  Signs Canada, SignCraft,  Signs of the Times, Screen Printing, Sign and Digital Graphics and  Sign Builder Illustrated. He also posted more than 325 stories on his blog (hingstssignpost.blogspot.com). In 2007 Hingst’s book, Vinyl Sign Techniques, was published.

Slides of Jim's Artwork

© 2015 Jim Hingst