Moisture is one of the most apparent threats to food packaging. Even small amounts of water can make crispy snacks soggy, cause fine powders to clump, and encourage mold growth. The right flexible packaging film with proper sealing and barrier protection can prevent the problems caused by moisture exposure.
PPC Flex is a leading food packaging supplier. Our experience allows us to provide flexible packaging solutions that withstand external conditions like moisture. In this guide, we’re sharing our expert insights into moisture barrier packaging and how we help manufacturers choose the right level of protection for their products.
To learn more about our packaging capabilities for food markets, contact our team.
How Does Moisture Barrier Packaging Protect Food Products
So, what’s the science behind moisture barrier packaging? Moisture barrier packaging creates a physical shield that prevents water vapor from passing through the packaging material and impacting the product inside. The shield is built into the film itself, through layers of specialized materials designed to resist moisture.
Water Vapor Transmission Rate (WVTR) and Moisture Protection
Typically expressed in grams per square meter, water vapor transmission rate (WVTR) measures how much water vapor passes through a given area of film over a set period. This is the primary metric that packaging engineers use when evaluating a film’s ability to protect products.
Top Moisture Barrier Films Used in Flexible Food Packaging
Several flexible packaging films offer notable moisture barrier performance. Each type has unique advantages that food manufacturers should be aware of. These films include:
- PE films (Polyethylene): Reliable and cost effective; polyethylene films are inherently water resistant, which makes them a popular choice for food packaging pouches and bags.
- PP/BOPP films (Polypropylene / Biaxially Oriented Polypropylene): These films offer effective moisture resistance along with clarity and stiffness, making them ideal for snack packaging and other products where shelf appeal is a top priority
- PET films (Polyethylene Terephthalate): Durable and resistant to moisture and punctures; PET films are well suited for outer layers in multilayer structures.
- Metallized films: These films deliver a thin layer of aluminum onto a plastic substrate, drastically improving moisture and light barrier protection without adding significant weight or compromising flexibility.
In many cases, the most effective barrier packaging solutions feature a combination of these materials. Layering complementary characteristics creates a single flexible film suited to a product’s specific needs.
Choosing the Right Moisture Barrier Film for Your Food Product
Matching the moisture barrier film to the application depends on the type of food product, its intended shelf life, and the shipping and storage conditions it will encounter.
Product Type
A food product’s moisture sensitivity, texture, and formulation all contribute to how much barrier protection it needs. Hygroscopic powder, for example, requires a much stronger moisture barrier than a shelf-stable baked good. Other formulation factors like fat content and level of acidity can also influence how a product interacts with its packaging over time.
Intended Shelf Life and Distribution Requirements
The expected shelf life of a product also plays a key role in moisture barrier film selection along with the storage conditions, transportation journey, and retail environment it will face before ending up in a customer’s home. Food products shipped to humid regions or traveling long distances often require stronger moisture barriers than products sold locally with shorter shelf lives.
Required Moisture and Oxygen
Moisture sensitivity goes hand in hand with oxygen sensitivity. Food products prone to oxidation need a film that prevents both due to the level of moisture in the air. Packaging engineers use WVTR values and oxygen transmission rates (OTR) to determine the ideal film structure.
Heat-Sealing and Mechanical Performance Requirements
A film with effective barrier properties also needs mechanical strength to withstand the shipping and handling conditions. Otherwise, even an expertly engineered moisture barrier packaging structure can fail at the seal.
Sustainability Conditions
Modern brands are prioritizing sustainable packaging, choosing recyclable, downgauged, and mono-material film structures that reduce environmental impact without sacrificing barrier performance.
Keep Food Products Protected Against Moisture with PPC Flex
Many food products depend on moisture barrier packaging to preserve their quality, texture, and shelf life. Selecting the best film for each application is about weighing the product with distribution conditions.
PPC Flex creates moisture barrier packaging built around real-world performance. With deep material expertise, we work closely with food manufacturers to understand their products and their supply chain to develop custom solutions. Contact us today for flexible packaging products centered around your business.