Role in the structure
EVOH helps limit oxygen transmission and aroma loss. Adjacent layers provide strength, sealing and protection for the barrier layer.
Material Characteristics
Gas barrier
Helps limit oxygen and other gas transmission in a suitable multilayer structure.
Solvent and chemical barrier
Can reduce permeation of selected solvents and chemicals, subject to grade and exposure conditions.
Aroma retention
Helps retain flavors and aromas in packaging applications.
Transparency
Can support transparent packaging that displays its contents.
Chemical resistance
Resistance to swelling depends on the chemical, temperature and exposure time.
Low thermal conductivity
May be considered in thermal barrier structures; insulation performance must be tested in the finished design.
EVOH for Multilayer Barrier Film
In a multilayer film, EVOH is normally the functional barrier layer rather than the whole film. Finished oxygen-barrier performance depends on the grade, layer thickness, tie layers, humidity, temperature and coextrusion conditions.
Service conditions
Higher humidity can reduce EVOH gas-barrier performance. Test the finished structure under conditions representative of storage and use.
Before grade selection
Compare the proposed grade with the line, layer structure and target test method. Check any food-contact or medical claim against grade documentation and destination-market rules.
Application Directions
- Food packaging
- Medical packaging
- Automotive fuel tanks
- Underfloor-heating pipes
- Pesticide containers
- Soil-fumigation films
- Vacuum insulation panels
- Insulated pipes
Information for an EVOH Film Inquiry
Share the structure and processing details so the grade and required documents can be checked for your application.
- Film application and packaged contents
- Proposed layer structure and EVOH position
- Extrusion or coextrusion line and processing window
- Film thickness and target barrier-layer ratio
- Barrier test method and conditions, including humidity
- Required declarations and destination-market documents
EVOH Barrier Film Questions
What is EVOH barrier film?
Usually it is a multilayer film in which EVOH limits oxygen and aroma transmission. Other layers provide strength, sealing, moisture protection and adhesion.
Why use EVOH in a multilayer film?
The structure combines the gas barrier of EVOH with the mechanical, sealing and moisture-protection functions of other polymers.
How does humidity affect the EVOH barrier layer?
Moisture can reduce gas-barrier performance. Evaluate the finished film at humidity and temperature conditions relevant to its intended use.
What information is needed to select an EVOH grade?
Provide the application, contents, layer structure and thickness, equipment, processing window, target test method and required documents.
Select the Grade for Your Process
Tell us the intended application, processing method, layer structure and target barrier requirements. Food-contact or medical suitability must be checked against the selected grade's documentation and the rules for the destination market.
Ask About EVOH- Application and target contents
- Film, sheet, bottle, pipe or molded part
- Layer structure and thickness
- Required test methods or compliance documents