Glossary / Films & coatings

TPU film

Thermoplastic means the material softens when it is heated and hardens again when it cools, over and over, without changing chemically. That is the property an installer leans on with a heat gun: film that has been coaxed over a compound curve can be relaxed, repositioned and set, and the same sheet behaves the same way the next time it meets heat.

Polyurethane is the polymer family. In this family it is the elastic, optically clear, abrasion-resistant end of it — which is why the same chemistry shows up in phone cases, conveyor belts and running-shoe midsoles as well as over the nose of a car.

Put together, TPU is a material you can stretch a long way before it marks, see straight through, and scuff without cutting. That combination is the whole reason paint protection film works at all.

A bumper is not flat. It is a compound curve, and a sheet laid over it has to grow in two directions at once without whitening, wrinkling or tearing at the edge. TPU's elasticity is what makes that possible, and it is why an installer can wrap a film past a panel edge rather than trimming it short and leaving a line for dirt to collect in.

It also has to disappear. A film over paint is only acceptable if it is optically clear and stays clear, which is a UV-stability question as much as an optical one — early films yellowed, and modern TPU is made with inhibitors specifically because they did.

And it has to take the hit. Abrasion resistance is what turns a stone strike into a mark on a consumable layer instead of a chip in the clear coat, which is the thing the customer is actually buying. The clear coat entry covers what is underneath and why it is finite.

These get conflated constantly, usually at the counter, and the difference is worth being able to say in a sentence. The table describes how each behaves rather than ranking them, and no brand is named: what is true of the material is not automatically true of a particular product.

The practical version: if the customer wants a different colour, they want a vinyl wrap. If they want the paint they have to survive the next three winters, they want PPF, which is TPU. A wrap over the nose of a commuter is not protection, and film in a colour is a different product with a different price.

It does not stop a deep gouge. A stone big enough or sharp enough to cut through the film will reach the paint, and no film changes that. What it changes is the frequency: the everyday grit that would have chipped the clear coat marks a consumable layer instead.

It does not heal a cut. Self-healing is a property of the topcoat and it works on scuffs and fine swirls in that topcoat, not on anything that goes through it. Selling it any wider than that is the most common way a PPF job turns into a warranty argument.

And it does not last forever. Films carry a service life and a warranty, and the two are different documents making different promises — the workmanship warranty entry explains why you want both. What TPU is good at is spending itself instead of your paint.

Film arrives on rolls, usually 60 inches wide, and is consumed by the linear foot. A full front pulls a few feet; a full body pulls many times that, plus the offcuts. Because TPU is the expensive part of the bill of materials, the difference between film tiers is a real cost difference rather than a badge, which is the honest answer to "why is your film more than theirs".

That is also why it is the material most worth counting. A four-figure roll treated as one inventory line cannot tell a shop what a job consumed, which is what film tracked to the foot is about, and what offcut is about at the other end.

For what the finished work sells for across coverage levels, how much does ppf cost carries six dated installer sources. This page deliberately publishes no per-foot figure: none that we could source.