Barrier Films for Flexible Packaging: EVOH, Nylon, PVDC, and How to Choose the Right One

Barrier films are the invisible workhorses inside every multilayer flexible package. They block oxygen, moisture, light, and aroma compounds from reaching your product — and the wrong choice will cost you shelf life, customer trust, or both. The three films that dominate this space are EVOH (ethylene vinyl alcohol), nylon (polyamide), and PVDC (polyvinylidene chloride). Each brings a different combination of strengths, and understanding where each one excels is the difference between a package that protects and one that just looks like it does.

I've watched brands burn through six figures in spoiled inventory because someone spec'd a barrier film based on a supplier's data sheet instead of actual storage conditions. Don't be that brand.

What a Barrier Film Actually Does Inside a Multilayer Structure

Flexible packaging is never one material. It's a sandwich — typically three to seven layers, each assigned a job. The outer layer handles printing and scuff resistance. The sealant layer bonds the package shut. And somewhere in the middle sits the barrier layer, doing the unglamorous work of keeping gases on the correct side of the wall.

Oxygen transmission rate (OTR) and moisture vapor transmission rate (MVTR) are the two numbers you'll see quoted most. OTR measures how much oxygen passes through a film per square meter per day. MVTR does the same for water vapor. A barrier film with an OTR of 0.5 cc/m²/day at 23°C is radically different from one at 5.0 cc/m²/day — that tenfold gap can mean the difference between a 12-month shelf life and a 4-month one.

The Flexible Packaging Association reported in 2024 that global demand for high-barrier flexible packaging reached $28.3 billion, growing at 5.1% annually. Food applications account for roughly 62% of that volume. The barrier layer is doing more economic heavy lifting than most packaging engineers get credit for.

EVOH: The Oxygen Barrier King

EVOH is the gold standard for oxygen blocking. Full stop. At standard conditions (23°C, 0% relative humidity), EVOH with 32 mol% ethylene content delivers an OTR below 0.1 cc·mil/100 in²/day. That's roughly 50 to 100 times better than nylon at the same thickness.

But here's the thing. EVOH has a fatal weakness: humidity.

As relative humidity climbs, EVOH's crystalline structure absorbs moisture and its barrier properties collapse. At 95% RH, that sub-0.1 OTR can balloon to 1.5 or higher. Kuraray's own technical documentation shows the degradation curve is steep — you lose roughly half your oxygen barrier performance between 65% and 85% RH.

That's why EVOH is almost never used as an exposed layer. It gets buried between polyethylene or polypropylene layers that shield it from ambient moisture. This coextrusion requirement adds cost and complexity, but the oxygen performance is worth it for products that can't tolerate even trace amounts — think processed meats, cheese, and retort meals.

Where EVOH earns its place:

• Thermoformed trays for deli meats and cheese
• Retort pouches where oxygen exclusion is non-negotiable
• Ketchup and sauce bottles (coextruded with PP or PE)
• Fuel tanks in automotive applications — yes, really

One stat that stuck: EVAL Company (Kuraray's EVOH division) estimated in 2023 that EVOH-based multilayer structures extend the shelf life of processed meat by 300% compared to non-barrier alternatives. That number drives the entire adoption story.

Nylon: The Puncture-Resistant All-Rounder

Nylon (polyamide 6 or 6,6) doesn't match EVOH on oxygen performance. Its OTR sits around 2.0–4.0 cc·mil/100 in²/day at standard conditions — decent, not spectacular. Where nylon shines is mechanical strength.

If your product has sharp edges, bones, frozen corners, or anything that could poke through a film, nylon is your first call. Its puncture resistance runs 3–5 times higher than EVOH at equivalent gauges. It also thermoforms beautifully, stretching evenly into deep cavities without thinning at the corners — a property that drives its dominance in vacuum-packed cheese, frozen foods, and medical device packaging.

Nylon handles humidity better than EVOH, too. It absorbs some moisture (nylon 6 can absorb up to 9% of its weight in water), but the barrier degradation is more gradual and predictable. For applications where you need moderate oxygen protection in variable-humidity environments, nylon offers a reliability that EVOH can't match without its protective cocoon.

Smithers reported in their 2024 flexible packaging market outlook that nylon-based barrier films account for approximately 18% of all flexible food packaging by volume in Europe, second only to metallized films. In the medical device space, that share jumps to over 40%.

Where nylon earns its place:

• Vacuum-packed cheese and processed meats with bone-in cuts
• Frozen food packaging that survives distribution abuse
• Medical device sterile barrier systems
• Thermoformed trays with deep draws (120mm+)

PVDC: The Double-Duty Barrier That Won't Quit

PVDC — most people know it as Saran when it's a consumer wrap — is the odd one out. It doesn't win on oxygen. It doesn't win on moisture. But it does both at the same time, and it does them well enough to matter.

Typical PVDC coatings deliver an OTR of 0.3–1.0 cc·mil/100 in²/day and an MVTR around 0.1–0.3 g·mil/100 in²/day. Neither number tops the specialist — EVOH beats it on oxygen, and PE or PP beats it on moisture. But PVDC provides meaningful protection against both simultaneously, which is exactly what many food products need.

Funny enough, PVDC's biggest advantage might be its application flexibility. It can be coextruded, laminated, or applied as a thin coating onto existing films. That coating approach means you don't need a full coextrusion line — a converted film with a PVDC lacquer can add barrier properties at a fraction of the capital cost.

The downside? Environmental pressure. PVDC contains chlorine, and incineration produces hydrochloric acid. The European Commission's 2025 packaging and packaging waste regulation flagged chlorinated polymers as materials of concern. Some major European retailers have already moved away from PVDC-coated films, pushing volume toward EVOH and metallized alternatives.

A 2024 analysis from AMI Consulting found that PVDC demand in European food packaging fell 11% between 2020 and 2024, while EVOH coextrusion volume grew 14% over the same period. North America and Asia haven't seen the same regulatory pressure — PVDC coating remains the most cost-effective barrier option for many applications in those markets.

Where PVDC still earns its place:

• Blister packaging for pharmaceuticals (dual barrier critical)
• Snack food wrappers where moisture AND oxygen matter equally
• Applications where coating is more practical than coextrusion
• Cost-sensitive markets without PVDC restrictions

Head-to-Head: The Numbers That Matter

| Property | EVOH (32 mol%) | Nylon 6 | PVDC (coating) | |---|---|---|---| | OTR (cc·mil/100 in²/day, 23°C/0% RH) | 0.01–0.10 | 2.0–4.0 | 0.3–1.0 | | MVTR (g·mil/100 in²/day, 38°C/90% RH) | 1.5–3.0 | 8.0–16.0 | 0.1–0.3 | | Puncture resistance | Low | High | Moderate | | Humidity sensitivity | Severe | Moderate | Low | | Thermoformability | Good (in multilayer) | Excellent | Limited | | Cost per m² (approx.) | $0.08–0.15 | $0.05–0.10 | $0.03–0.06 | | Recyclability concern | Low | Low | High (chlorine) |

Look — these numbers shift depending on grade, thickness, and supplier. But the relative ranking holds across most commercial applications. EVOH dominates oxygen, nylon dominates toughness, PVDC dominates dual-barrier economy.

How to Actually Choose: A Decision Framework

Forget the film first. Start with your product.

Step 1: Identify the primary degradation mechanism. Is your product oxygen-sensitive (lipid oxidation, vitamin degradation, color loss)? Moisture-sensitive (caking, softening, microbial growth)? Or both?

Step 2: Map your distribution conditions. A package stored at 4°C and 60% RH faces a different barrier challenge than one sitting in a Southeast Asian warehouse at 35°C and 90% RH. EVOH's humidity weakness isn't theoretical — it's the kind of thing that kills you in tropical supply chains.

Step 3: Assess mechanical requirements. Bone-in chicken? Frozen burritos with sharp corners? You need puncture resistance, and that means nylon in the structure regardless of which barrier film you choose for gas protection.

Step 4: Check regulatory and retailer requirements. If you're selling into European grocery, PVDC may already be off the table. If you're exporting to markets without those restrictions, PVDC might save you 30–40% on barrier costs.

Step 5: Cost the full structure, not just the barrier layer. EVOH requires coextrusion with moisture-protective layers. That multilayer structure costs more to produce than a nylon/PE lamination or a PVDC-coated film. The barrier film itself might be cheap — the structure it demands might not be.

I've seen too many packaging engineers fixate on OTR numbers without running the full structure economics. A barrier film that costs twice as much per square meter might still be cheaper if it simplifies the overall layer count. Run the math on the whole package, not just the film.

The Emerging Fourth Option: Metallized Films

Worth mentioning: metallized BOPP and metallized PET are eating into traditional barrier film territory. A thin aluminum vapor deposition layer delivers excellent oxygen and moisture barrier without the recyclability concerns of PVDC or the humidity sensitivity of EVOH.

According to Smithers 2024 data, metallized films now account for roughly 23% of barrier flexible packaging globally — up from 17% five years ago. The tradeoff? You can't see through a metallized film, and the barrier layer can crack at flex points. For products that need transparency or repeated flex (like stand-up pouches that get squeezed daily), metallized films don't always work. For more on how stand-up pouches handle material and barrier selection, see our guide on stand-up pouch materials and closures.

What's Coming Next for Barrier Technology

The industry is chasing two white whales: a high-barrier film that's fully recyclable in existing PE streams, and a bio-based barrier that matches EVOH performance.

Several companies are making progress. Kuraray launched a thinner EVOH grade in late 2025 that maintains barrier at just 3 microns — thin enough to potentially qualify as a "de minimis" layer under EU recyclability rules. Nylon manufacturers are exploring bio-PA (bio-based polyamide) derived from castor oil, though barrier performance still lags behind petroleum-based grades by roughly 15–20%.

Neither solution is ready to replace existing options at scale. But if you're specifying barrier films today for a product launch in 2027 or 2028, build in the flexibility to swap. Lock yourself into a seven-layer EVOH coextrusion and you might be redesigning sooner than you think.

For a deeper look at how metalized films perform against traditional coatings, we covered that in detail. And if you're comparing base film options like polypropylene across different applications, that's worth reading alongside this one.

FAQ

Can I use EVOH in packaging for tropical climates?

Not without serious structural protection. EVOH loses up to 80% of its oxygen barrier performance above 85% relative humidity. If your product ships through tropical supply chains, you need thick PE or PP layers flanking the EVOH core — or consider nylon or PVDC as your primary barrier instead.

Is PVDC actually being banned in Europe?

Not banned outright, but effectively discouraged. The EU Packaging and Packaging Waste Regulation (PPWR) finalized in 2025 sets recyclability targets that chlorinated polymers like PVDC struggle to meet. Several major European retailers have already adopted voluntary PVDC-free sourcing policies. If Europe is a key market, plan your transition now.

Why not just metallize everything and skip barrier films entirely?

Metallized films are excellent for opaque applications — snack bags, coffee pouches, pet food. But they can't provide transparency, they crack under repeated flexing, and the aluminum deposition layer is measured in angstroms — physical damage during distribution can create pinhole failures that a solid barrier film wouldn't suffer. For high-value or long-shelf-life products, dedicated barrier films remain more reliable.

How much does switching from PVDC to EVOH add to my packaging cost?

Expect a 25–50% increase in total structure cost, depending on your current package design. EVOH resin itself isn't dramatically more expensive, but it requires coextrusion with moisture-protective layers, which adds equipment requirements and film complexity. The offset comes from improved shelf life performance, which can reduce spoilage and returns.

Can nylon serve as both the structural and barrier layer in a package?

Yes, in applications where moderate oxygen barrier is sufficient. Nylon/PE laminations are common in vacuum-packed cheese and frozen foods where puncture resistance matters as much as gas barrier. You won't match EVOH's oxygen performance, but for products with shorter shelf life targets (under 60 days refrigerated), nylon's dual role can simplify your structure and reduce cost.