Key Takeaways
- High barrier films slow the passage of oxygen, moisture, light, and aroma so your product stays fresh longer.
- Barrier performance is measured by OTR (oxygen) and MVTR/WVTR (moisture), where lower numbers mean a higher barrier.
- The right film depends on what your product is sensitive to, its target shelf life, and how it is filled and stored.
- Recyclable and post-consumer recycled high barrier options now exist without giving up protection.
- Barrier structures can be built into stand-up pouches, lay flat pouches, rollstock, and more.
Introduction
If your product loses flavor, softens, fades, or goes stale before it reaches the shelf, the packaging film is often the reason. Oxygen drives oxidation and spoilage, moisture ruins texture, light degrades color and nutrients, and lost aroma tells shoppers a product is past its prime. A high barrier film is engineered to slow all four.
This guide is written for brand owners and packaging and procurement teams who need to make a confident material decision without a materials-science background. We will explain what a high barrier film is, what it protects against, how barrier performance is measured, and how to match the right structure to your product and format. The goal is a practical framework you can apply to your own SKUs, not a sales pitch.
What Is A High Barrier Film?
A high barrier film is a flexible packaging film engineered to strongly limit the passage of gases (mainly oxygen), water vapor, light, and odor. “Barrier” refers to permeability, meaning how much of a substance can move through the film over time. A high barrier film lets very little through; a standard film lets more.
Most high barrier films are not a single material. They are multilayer structures built by co-extrusion (layers formed together in one process) or lamination (separate layers bonded with adhesive). Each layer does a job: one blocks oxygen, another blocks moisture, another adds strength or a printable, sealable surface. Combining materials this way lets a film do things no single plastic can do on its own.
It helps to know that “high barrier” is a practical description, not a fixed legal category. Films with an OTR (Oxygen Transmission Rate) below roughly 1 cc/m²/day are generally described in packaging science as providing excellent oxygen barrier performance, though the exact threshold that matters varies by application. The point is not chasing the lowest possible number. It is matching the barrier to what your product actually needs.
What High Barrier Films Protect Against
High barrier films control four things. Understanding each one helps you decide which barrier matters most for your product.
Oxygen. Oxygen is a key driver of oxidation and aerobic microbial spoilage in food. It turns oils rancid, fades color, and flattens flavor. Coffee, nuts, snacks, and supplements are especially oxygen-sensitive, so oxygen barrier is often the first priority.
Moisture. Water vapor moving in or out of a package causes sogginess, clumping, or staling. A strong moisture barrier keeps crackers crisp, powders free-flowing, and dry pet food from softening. For some products, you are keeping moisture out; for others, you are holding it in.
Light and UV. Light degrades color, fats, and light-sensitive nutrients. Opaque or metalized structures shield products such as coffee, vitamins, and oils from this kind of damage.
Aroma and odor. A good aroma barrier keeps a product’s scent inside the pack and keeps outside odors from getting in. This protects the “fresh” signal shoppers rely on and prevents cross-contamination between nearby products, which matters for coffee, spices, and pet food.
Most products are sensitive to more than one of these. A snack may need oxygen and moisture protection; a supplement may need all four. Naming your product’s sensitivities early makes every later decision simpler.
How Barrier Performance Is Measured
Two numbers do most of the work on a spec sheet, and both follow the same rule: lower is better.
OTR (Oxygen Transmission Rate) measures how much oxygen passes through a film, reported in cc/m²/day. ASTM D3985 is a common test method, using a coulometric sensor (a device that detects oxygen electrically) under dry conditions at 23°C and 0% relative humidity.
MVTR or WVTR (Moisture/Water Vapor Transmission Rate) measures how much water vapor passes through, reported in g/m²/day. ASTM F1249 is a common method, using a modulated infrared sensor, and is often run at 38°C and 90% relative humidity.
Test conditions matter. The same film can post different numbers at different temperatures and humidity levels, so always compare specs measured under the same conditions.
There is no single, universally defined number that separates “high barrier” from everything else. As a working reference, films with an OTR below roughly 1 cc/m²/day are widely regarded as excellent oxygen barriers, but the threshold that matters depends on your product and shelf life. Match the numbers to your product’s needs rather than chasing the lowest figure on the page, because higher barrier usually adds cost and can affect recyclability.
Common High Barrier Film Materials And Structures
Different materials block different things, which is exactly why high barrier films are layered. Here are the building blocks in plain language.
For oxygen, EVOH (ethylene vinyl alcohol) is a leading commercial oxygen-barrier layer. It has one catch: it loses barrier when wet, so it needs polyethylene (PE) outer layers to protect it from moisture. Nylon, or polyamide (PA), adds toughness and puncture resistance and provides intermediate gas-barrier support, but it is not a stand-alone high oxygen barrier.
For moisture, polyethylene (PE) is an excellent moisture barrier and a reliable, sealable outer layer. That is why you often see EVOH tucked between PE layers: PE handles moisture and sealing while EVOH handles oxygen.
Lamination and co-extrusion combine these strengths into one film. A typical structure might pair a printable outer layer, an oxygen barrier in the middle, and a sealable moisture barrier on the inside.
Metalized High Barrier Films
Metalized films carry a microscopically thin layer of aluminum deposited onto a plastic film such as PET. They deliver strong oxygen, moisture, and light barrier in a thin, flexible format, and they block light completely, which suits coffee, snacks, and other light-sensitive products. As neutral industry context, aluminum foil provides near-zero oxygen transmission (the highest barrier available), but foil is rigid, foil-free structures are increasingly preferred, and thin-gauge foil can develop pinholes that undercut its barrier.
Clear And Transparent High Barrier Films
When shoppers want to see the product, clear high barrier structures deliver protection without an opaque metal layer. These films use transparent oxygen and moisture barrier layers to keep contents visible while still guarding freshness. Choose clear when product visibility drives purchase, such as premium snacks, produce, or specialty items, and reserve metalized structures for products that benefit from full light block.
How To Choose The Right High Barrier Film
Use this five-step checklist to narrow your options in order.
- Identify your product’s sensitivities. Is it mainly oxygen, moisture, light, or aroma, or a combination? This determines which barrier layers you actually need.
- Set a target shelf life. A 3-month shelf life and an 18-month shelf life call for very different barrier levels. Define the number you need to hit before you compare films.
- Factor in fill method and equipment. Will you run vertical or horizontal form-fill-seal (VFFS/HFFS) machines or fill premade pouches? The film has to handle your line speed, seal reliably, and survive the process (this is called machinability).
- Balance barrier, recyclability, and cost. The highest barrier is not always the right barrier. Weigh protection against your sustainability goals and budget so you do not over-specify.
- Validate with a supplier. Confirm the structure against your real product, conditions, and equipment before committing to a production run.
Working in this order keeps the decision grounded in your product rather than in a spec sheet. If you are unsure, our packaging experts can help you match a barrier level to your product and format so you protect what matters without paying for barrier you do not need.
Sustainable High Barrier Film Options
High barrier and sustainability are no longer mutually exclusive. You can now protect a sensitive product and still meet recyclability and recycled-content goals.
Recyclable Packaging. In the US, pure polyethylene (PE) films are recyclable through How2Recycle Store Drop-off, meaning you return them at participating retail stores rather than in curbside bins. Recyclable PE high barrier structures let you keep strong protection while qualifying for store drop-off. Multi-material laminates that mix different plastics do not qualify, so a mono-material PE design is what makes recyclability possible.
Post-Consumer Recycled (PCR) Packaging. PCR films incorporate recycled content from materials that consumers have already used, reducing the amount of new plastic in your pack.
Circular Packaging. Beyond individual materials, circular packaging is about keeping materials in use and reducing waste, and we continue ongoing innovation of circular initiatives to expand what is possible.
A quick note on labeling: use the term “resin identification code” (the number inside the triangle that identifies the plastic type) when guiding shoppers. With the right design, these sustainable structures can match conventional performance, so ask your supplier to confirm barrier specs for the recyclable or PCR option you are considering.
Matching High Barrier Films To Packaging Formats
A barrier structure is only useful once it becomes a package your customer picks up. The same high barrier films can be built into a range of formats, so you can choose the shape that fits your product, fill method, and shelf presence.
At ePac, we build high barrier structures into:
- Stand-up pouches for strong shelf presence and resealable convenience.
- Lay flat pouches for lighter, single-serve, or sample formats.
- Rollstock for high-speed automated filling lines.
- Quad seal and flat bottom pouches for larger volumes and a boxy, shelf-stable footprint.
Your format choice depends on the product, how it is filled, and how you want it to look on the shelf. Because we print digitally, you can pair high barrier protection with fully custom graphics, low minimums, and fast turnaround, which makes it practical to launch, test, and scale without oversized commitments.
Conclusion
Choosing a high barrier film comes down to a simple sequence: identify what your product is sensitive to, set the shelf life you need to hit, match the material and format to those needs, and weigh sustainability alongside barrier and cost. Read the OTR and MVTR numbers in context, and remember that the best film is the one matched to your product, not the one with the lowest possible transmission rate. When you are ready to translate that framework into a real structure, talking to a packaging expert is the fastest way to get it right the first time.
Frequently Asked Questions
What OTR Or MVTR Value Counts As A High Barrier Film?
There is no single official cutoff. As a working reference, an OTR (Oxygen Transmission Rate) below roughly 1 cc/m²/day is widely regarded as an excellent oxygen barrier, and the right target depends on your product and shelf life.
How Is Oxygen Transmission Rate (OTR) Tested?
Briefly, a film sample is sealed between an oxygen source and a sensor, then measured at controlled temperature and humidity. ASTM D3985 is a common method that uses a coulometric sensor (a device that detects oxygen electrically) at 23°C and 0% relative humidity.
Is High Barrier Film The Same As Foil Packaging?
No. Foil is one legacy high-barrier option with near-zero oxygen transmission, but metalized and clear high-barrier films can deliver strong protection in a thinner, more flexible, and often more recyclable format.
Which Products Need High Barrier Film The Most?
Oxygen-, moisture-, and light-sensitive goods benefit most. Think coffee, snacks, supplements, powders, and pet food.
Ready to match the right high barrier film to your product? Get Pricing or Contact us to talk through your barrier needs, format, and timeline with a packaging expert.