Barrier films are the backbone of modern flexible packaging. They protect products from oxygen, moisture, light and aroma transfer — factors that directly affect shelf life, taste, safety and brand reputation.
For South African manufacturers and brands, choosing the right barrier film is especially critical. Our climate, long distribution chains and variable cold-chain infrastructure place extra demands on packaging performance.
What Are Barrier Films?
Barrier films are multi-layer flexible materials engineered to control the transmission of gases and vapours. Unlike standard polyethylene films, they combine different polymers (such as PET, PA, EVOH, and specialised PE grades) to deliver targeted protection.
The key performance metrics are:
- Oxygen Transmission Rate (OTR) — Measured in cc/m²/day
- Water Vapour Transmission Rate (WVTR) — Measured in g/m²/day
- Aroma barrier — Critical for coffee, spices and high-value foods
Why Barrier Performance Matters in South Africa
South Africa’s warm, sometimes humid conditions accelerate product degradation. A film that performs well in Europe can fail quickly here if the barrier properties are not correctly specified.
Common challenges include:
- High summer temperatures accelerating oxidation in snacks and oils
- Humidity variation between coastal and inland regions affecting moisture-sensitive products
- Long transit times from factory to retail in areas with inconsistent cold chains
Benefits of High-Performance Barrier Films
1. Extended Shelf Life Proper barrier films can double or triple the shelf life of many products. This is especially valuable for export, long-distance distribution, or products with seasonal demand.
2. Reduced Food Waste Better barrier performance means fewer returns and less product spoilage — a major sustainability and cost win for South African retailers and manufacturers.
3. Brand Protection Off-tastes, colour changes and texture issues damage consumer trust. Barrier films help maintain product quality from factory to consumer.
4. Cost Efficiency While high-barrier structures cost more per square metre, the total cost of ownership is often lower due to reduced waste, fewer complaints and the ability to use lighter gauges.
Common Barrier Structures Used in South Africa
At Flexweb we regularly produce the following structures:
- PET/PE — Good general-purpose barrier for many dry goods
- PET/EVOH/PE — High oxygen barrier for meat, cheese and processed foods
- OPA/EVOH/PE — Excellent forming properties for thermoforming applications
- PET/Alu/PE — Maximum barrier for long-shelf-life products and pharmaceuticals
Choosing the Right Barrier for Your Product
When specifying barrier films, consider:
- Product sensitivity (oxygen, moisture, light, aroma)
- Required shelf life
- Packaging format (pouch, lidding, flow wrap, etc.)
- Filling equipment and seal requirements
- Distribution conditions (ambient, chilled, frozen)
Our technical team works directly with customers to match the right structure to these variables.
How Flexweb Supports South African Brands
As a local manufacturer with in-house film extrusion, printing, lamination and conversion, we offer:
- Fast lead times compared to imported films
- Consistent quality with full batch traceability
- Technical support from structure design through to production
- Flexible minimum order quantities suited to the local market
Need help specifying the right barrier film?
Contact our technical team to discuss your product, shelf-life targets and packaging format. We’ll recommend the optimal structure and provide samples from our Germiston facility.
Request a Barrier Film Specification →
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