Flexible packaging is widely used in food, pharmaceutical, personal care and other industrial applications. Its lightweight structure, versatility and ability to combine different materials make it suitable for a broad range of packaging requirements.
The barrier properties of flexible packaging play an important role in protecting products from oxygen, moisture and other gases. Permeability testing of flexible packaging helps manufacturers and laboratories characterize material performance, compare packaging structures and support material development and quality control.
ExtraSolution provides solutions for measuring oxygen transmission rate (OTR), water vapor transmission rate (WVTR) and carbon dioxide transmission rate (CO₂TR) through films and barrier materials.
Why Measure the Permeability of Flexible Packaging?
Flexible packaging can be made from different materials and structures, depending on the product to be packaged and the required performance.
Measuring gas and water vapor transmission helps laboratories and manufacturers:
- Characterize the barrier properties of packaging materials.
- Compare alternative materials and packaging structures.
- Support the development of new flexible packaging solutions.
- Evaluate changes in material composition.
- Monitor material performance during quality control.
- Obtain measurement data under defined test conditions.
The appropriate measurement depends on the product’s sensitivity, the packaging design and the substances that need to be controlled.
Which Barrier Parameters Should Be Evaluated?
The most relevant transmission parameter depends on the intended application and the barrier requirements of the packaging.
Oxygen Transmission Rate (OTR)
OTR measures the rate at which oxygen passes through a material under specified test conditions. Oxygen transmission can be an important consideration when evaluating packaging for products sensitive to oxidation.
OTR measurements help compare the oxygen barrier performance of different films and flexible packaging structures.
Learn more about Oxygen Permeability and OTR: Measurement and Analysis.
Water Vapor Transmission Rate (WVTR)
WVTR measures the rate at which water vapor passes through a material under specified test conditions. It is relevant when evaluating the moisture barrier properties of flexible packaging.
WVTR testing can help compare materials intended to limit moisture transfer and assess their performance under defined temperature and humidity conditions.
Learn more about Water Vapor Permeability and WVTR: Measurement and Analysis.
Carbon Dioxide Transmission Rate (CO₂TR)
CO₂TR measures the transmission of carbon dioxide through a material under specified test conditions. It can be relevant for packaging applications in which carbon dioxide exchange needs to be characterized.
CO₂TR measurements help evaluate and compare the carbon dioxide barrier performance of different packaging materials.
Learn more about CO₂ Permeability and CO₂TR: Measurement and Analysis.
Which Flexible Packaging Materials Can Be Tested?
Flexible packaging uses a variety of material types and structures. Depending on the instrument configuration, sample characteristics and applicable test method, permeability testing may be used to characterize materials such as:
- Single-layer plastic films.
- Multilayer plastic films.
- Laminated packaging materials.
- Metallized films.
- Coated barrier materials.
- Other film-based packaging structures.
The suitability of a material for a particular test depends on its composition, thickness, surface characteristics and the requirements of the measurement method.
For multilayer structures and laminates, testing the complete material provides information about its overall barrier performance.
Learn more about Permeability Testing of Multilayer Films and Laminates.
What Influences Flexible Packaging Barrier Performance?
The barrier performance of flexible packaging depends on the materials used, the structure of the packaging and the conditions under which transmission is measured.
Material Composition
Different polymers, coatings and other barrier materials can exhibit different oxygen, water vapor and carbon dioxide transmission characteristics. Material selection should reflect the requirements of the intended packaging application.
Packaging Structure
Flexible packaging may consist of a single material or several layers combined to achieve specific properties. The overall barrier performance depends on the complete structure rather than on the properties of an individual layer alone.
Thickness and Surface Characteristics
Material thickness and surface characteristics can affect test preparation and the interpretation of measurement results. Samples should be prepared and tested according to the selected method.
Temperature and Relative Humidity
Temperature and relative humidity can influence transmission measurements, particularly for moisture-sensitive materials. Test conditions should be selected and documented to support meaningful comparisons.
Intended Application
The required barrier properties depend on the product being packaged and its sensitivity to oxygen, moisture or carbon dioxide. Defining the application helps determine which parameters should be measured.
Flexible Packaging for Food and Other Applications
Flexible packaging is used in many sectors, including food packaging and pharmaceutical packaging. In each application, the required barrier performance depends on the product, the packaging structure and the intended conditions of use.
For food packaging, oxygen and moisture transmission measurements can help characterize packaging materials used to protect product quality and support shelf-life development.
Explore Permeability Testing for Food Packaging to learn more about barrier measurements for food packaging materials.
For pharmaceutical packaging, permeability testing can contribute to the characterization of packaging materials and their gas and moisture barrier properties. The appropriate evaluation depends on the specific packaging system and the applicable requirements.
Barrier measurements are one part of packaging evaluation and do not, on their own, establish product safety or regulatory compliance.
How Is Flexible Packaging Permeability Measured?
Permeability testing measures the transmission of a selected gas or water vapor through a sample under defined conditions.
The test procedure depends on the parameter being evaluated, the characteristics of the material and the applicable test method.
When planning a measurement, laboratories should consider:
- The parameter required: OTR, WVTR, CO₂TR or a combination of these.
- Material compatibility: confirm that the instrument and test configuration are suitable for the sample.
- Test conditions: define the required temperature and relative humidity.
- Sample preparation: follow the requirements of the selected method.
- Measurement range: verify that the instrument is suitable for the expected transmission values.
- Repeatability and documentation: apply consistent conditions when comparing materials or monitoring changes.
Using defined test conditions helps laboratories compare alternative packaging materials and document their measured barrier performance.
How to Choose a Permeability Tester for Flexible Packaging
The most suitable instrument depends on the materials being tested, the required transmission parameters and the laboratory’s workflow.
Before selecting a system, consider the following factors:
- Measurement capabilities: determine whether oxygen, water vapor, carbon dioxide or multiple parameters need to be measured.
- Sample types: verify compatibility with the flexible films and packaging materials used in your applications.
- Environmental conditions: identify the required temperature and relative humidity conditions.
- Testing requirements: consider sample throughput and the number of parameters to be evaluated.
- Measurement range and test methods: confirm suitability for the intended applications.
- Data handling: consider how results will be recorded, compared and reported.
If different barrier properties need to be evaluated across the same range of materials, a system capable of measuring multiple transmission parameters may help consolidate testing activities.
ExtraSolution Instruments for Flexible Packaging Testing
ExtraSolution offers solutions for measuring oxygen, water vapor and carbon dioxide transmission through films and barrier materials. The appropriate instrument depends on the parameters required and the characteristics of the samples.
MultiPerm O2-CO2
Designed to measure oxygen transmission rate (OTR) and carbon dioxide transmission rate (CO₂TR).
Explore MultiPerm O2-CO2.
MultiPerm O2-H2O
Designed to measure oxygen transmission rate (OTR) and water vapor transmission rate (WVTR).
Explore MultiPerm O2-H2O.
MultiPerm H2O-CO2
Designed to measure water vapor transmission rate (WVTR) and carbon dioxide transmission rate (CO₂TR).
Explore MultiPerm H2O-CO2.
TotalPerm
Combines OTR, CO₂TR and WVTR measurement capabilities in one integrated system.
Explore TotalPerm.
PermeH2O
Provides a dedicated solution for measuring water vapor transmission rate (WVTR).
Explore PermeH2O.
Instrument suitability depends on the material, the selected test method and the required test configuration. Confirm compatibility with ExtraSolution before selecting a system for a specific application.
Evaluate Flexible Packaging Barrier Properties with ExtraSolution
Reliable permeability measurements can help laboratories characterize flexible packaging materials, compare alternative structures and support packaging development and quality control.
ExtraSolution provides solutions for measuring oxygen, water vapor and carbon dioxide transmission through films and barrier materials.
Contact ExtraSolution to discuss your materials, measurement requirements and the most suitable testing solution.