Introduction
Barrier performance determines how well a package protects food from oxygen, moisture, light, and external contamination.
Different materials provide different levels of protection. Understanding these materials helps manufacturers design optimized packaging structures.
Common High-Barrier Materials Explained
PA (Nylon)
- Excellent puncture resistance
- Good oxygen barrier
- Strong mechanical performance
Commonly used in vacuum pouches and thermoforming bottom webs.
EVOH
- Outstanding oxygen barrier
- Sensitive to moisture (requires multilayer protection)
Widely used in high-barrier thermoforming films and shrink films.
PVDC
- High oxygen and moisture barrier
- Stable performance in humid environments
Often used in premium shrink films.
Aluminum (AL)
- Near 100% light and oxygen barrier
- Used in retort and ovenable applications
Suitable for ready meals and high-temperature sterilization.
Why Multilayer Co-Extrusion Matters
Modern flexible packaging combines 5–9 layers of materials to achieve:
- Balanced mechanical strength
- Optimal sealing performance
- Customized barrier levels
- Cost efficiency
Each layer serves a functional purpose, from sealing to protection.
Selecting the Right Structure
Key questions to ask:
- What shelf life is required?
- Is the product sensitive to oxygen or moisture?
- Will it undergo sterilization or high-temperature cooking?
- What machinery will be used?
Material structure must match processing conditions and regulatory requirements.
Final Thoughts
High-barrier packaging is not just about thickness — it’s about intelligent material engineering.
Working with a knowledgeable supplier ensures reliable performance, regulatory compliance, and cost optimization.
