TPU Film vs EVA in Foam, Footwear and Packaging Applications
Resilience, Density and What Survives a Season of Use
TPU film vs EVA is a comparison between a resilient elastomer and a forgiving foam, and the wrong choice usually shows up as a product that feels right on day one and flat by the end of the season.
EVA is cheaper, lighter in foam form and easier to mould, while TPU returns energy, resists abrasion and can be made into a film that bonds and seals.
This comparison covers the structural difference, the properties that decide midsole and packaging performance, and the cases where each material is clearly the better buy.
What Each Material Actually Is
EVA is a copolymer of ethylene and vinyl acetate, and its properties depend heavily on the vinyl acetate content. Higher acetate content gives softness and clarity; lower content gives stiffness closer to polyethylene.
In footwear and packaging, EVA is almost always used as a crosslinked foam. The foam structure, not the polymer alone, provides the cushioning, and that structure is what degrades with use.
TPU is a block copolymer that can be solid or foamed. In solid film form it is tough and elastic, while TPU Foam gives a lighter, more resilient cushioning material with better rebound than crosslinked EVA foam.
The critical difference is crosslinking. Crosslinked EVA foam cannot be remelted, so scrap and end-of-life parts become waste, while TPU remains thermoplastic and can be reprocessed.
Resilience and Compression Set
Compression set is where the two materials separate most clearly. A crosslinked EVA foam takes a permanent set after repeated loading, which is why a tired midsole stays compressed and stops returning energy.
TPU foam recovers more of its height after the load is removed, so the cushioning stays closer to its original performance over the life of the product. That difference is measurable in a repeated compression test rather than by feel.
Energy return follows the same pattern. TPU returns a higher proportion of the input energy, which is why it is used in performance footwear where rebound is a selling point rather than a comfort detail.
EVA can be tuned towards resilience with the right formulation and density, but the improvement is limited by the foam structure. At equal density, a well-made TPU foam usually holds its properties longer.
Weight and Density
EVA foam has a weight advantage at very low densities, which is why it remains common in budget footwear and protective packaging. Weight is often the deciding factor in those categories, not durability.
TPU foam can reach low densities too, and modern foaming processes have narrowed the gap considerably. Where a TPU foam is specified at a comparable density, the weight difference is usually small enough to be offset by the thinner section it allows.
Solid TPU film is denser than EVA foam by a wide margin, so a direct substitution is not meaningful. The comparison only makes sense when both materials are used in their appropriate form for the same function.
For packaging, the practical question is how much material is needed to protect the product. A thinner TPU foam or film can sometimes replace a thicker EVA insert, which changes the weight calculation entirely.
Durability in Real Service
Abrasion resistance strongly favours TPU. EVA foam abrades quickly at the heel and toe, which is why footwear brands add rubber or TPU inserts at high-wear locations rather than relying on the foam alone.
Hydrolysis is the weakness to watch in TPU. Polyester-based grades in warm humid conditions can degrade, so footwear and outdoor applications normally specify polyether-based TPU or a hydrolysis-stabilised grade.
EVA is chemically more stable against moisture but suffers from UV degradation and from the loss of foam structure. A foam that crumbles or flattens has failed even though the polymer itself has not degraded.
Cold performance is another differentiator. EVA foam stiffens noticeably in cold conditions, while TPU retains flexibility down to lower temperatures and can be formulated for cold-climate use.
Comparing the Deciding Properties
| Property | TPU | EVA |
|---|---|---|
| Compression set | Low, recovers well | Higher, flattens with use |
| Abrasion resistance | High | Low to moderate |
| Weight at low density | Competitive in foam form | Very light |
| Recyclability | Thermoplastic, reprocessable | Crosslinked, not remeltable |
| Bonding and sealing | Heat sealable, laminates well | Needs adhesive, poor sealing |
| Cost per kilogram | Higher | Lower |
The cost line is the one that needs the most care. A cheaper material that must be reinforced at wear points, replaced sooner or scrapped rather than recycled rarely produces a lower total cost.
Processing and Assembly
EVA is moulded and crosslinked in a press, which suits high-volume parts with simple geometry. TPU can be extruded, blown, foamed, laminated and heat sealed, which suits assemblies that need to be joined to other layers.
- TPU bonds to fabric and film by heat, which removes adhesive from the assembly
- EVA foam needs adhesive or priming to join, and the joint is usually the weak point
- TPU must be dried before melt processing, while EVA foam is already crosslinked
- TPU scrap can be reground or reprocessed, while EVA foam scrap is usually downcycled or discarded
- Both can be die cut, but TPU holds a cleaner edge on thin sections
Where the product is a single moulded part, EVA is efficient. Where the product is an assembly of layers, TPU usually saves a process step because it can be sealed rather than glued.
Where EVA Still Wins
EVA remains the right choice for low-cost protective packaging, single-use inserts and applications where weight and price dominate and service life is short. There is no technical argument for a long-life material in a product that is discarded immediately.
It also wins where very low density matters more than resilience, such as lightweight padding and some budget footwear components. In those cases the specification is defined by weight and cost rather than by performance.
The footwear foam comparison in more detail is set out on the TPU foam film for work footwear page, which covers the density and rebound trade-offs.
Density, Hardness and Foam Structure
Foam performance is set by cell structure as much as by polymer. Closed cells give buoyancy and low water uptake, open cells give softness and airflow, and a mixed structure gives neither predictably.
Density and hardness are independent variables in foam, and buyers often treat them as one. A low-density foam can be made firm by formulation, and a high-density foam can be made soft, so both numbers have to be specified.
Cell size affects the feel but also the durability. Coarse cells concentrate stress at the cell wall and crack earlier, while fine, uniform cells distribute load and hold their shape through more cycles.
That is why two foams at the same density can behave differently in a compression test. The specification should name the density, the hardness and the compression set limit together, not one of them.
Making the Choice
- Define the expected service life in months of use rather than in production volume
- State whether the part must be joined to another layer, and by which process
- Set a compression set limit and test both candidates to it
- Check the cold and wet performance if the product will be used outdoors
- Compare total cost including reinforcement, adhesive and end-of-life disposal
Zhejiang Huanlong New Material Science Technology Co.,Ltd produces TPU film and foam on 44 lines across three manufacturing bases, with two R&D centres and more than 30 engineers. Huanlong supplies both solid and foamed constructions, and the production system holds ISO 9001:2015, ISO 14001 and ISO 45001 certification.
The short version: choose EVA for short-life, low-cost, very light parts, and TPU where the product must keep its cushioning, resist abrasion, be sealed or be recycled. Test compression set rather than judging by feel.
TPU film vs EVA is a decision about service life, not about softness.
Frequently Asked Questions About TPU Film vs EVA
Is TPU better than EVA for footwear?
For performance and durability, usually yes, because TPU foam holds its height and resists abrasion better. For budget products with a short life, EVA remains the more economical choice.
Why does EVA foam flatten over time?
Repeated loading breaks down the foam cell structure and the crosslinked network takes a permanent set. Once the cells collapse, the material cannot recover the height or the cushioning it had when new.
Can TPU foam be recycled?
It is thermoplastic, so it can be reprocessed in principle, which is a real advantage over crosslinked EVA. In practice it needs a mono-material collection stream to be recycled at scale.
Which is lighter?
At the lowest densities EVA foam is lighter, but TPU foam at comparable density is close and often allows a thinner section. The relevant figure is the weight of the finished part, not the density of the material.
Does TPU work in cold weather?
Better than EVA foam, which stiffens sharply in the cold. TPU retains flexibility at lower temperatures, and specific cold-flexible grades are available for winter and cold-chain applications.
Send the part weight, the expected service life and the compression set limit, and a TPU grade or foam density can be proposed. Huanlong can supply TPU film and foam for a direct TPU film vs EVA evaluation.
See How the Film Is Made Ask About TPU Film vs EVA