The Universal Selection Source: Plastics & Elastomers

Barrier Material Selection

This content is designed to explain the basics behind barrier materials and their functioning. You will also find some very common barrier materials brought to use such as polyamides, PVdC, EVOH- copolymer of Ethylene & Vinyl Alcohol, Polyethylene Naphthalate, etc. Read on and explore their advantages, disadvantages, and barrier properties and more!

What is a Barrier Plastic?


Barrier materialsA barrier plastic prevents the diffusion of a substance above a certain limit. Depending on the targeted application, the substance may be gases (O2, CO2, N2) moisture, hydrocarbon vapors, contaminates, odors, flavors, aromas. For example:
  • In industrial applications, oxygen transmission barrier (OTR) is generally the most important
  • Moisture vapor barrier (WVTR) is a primary requirement of flexible packaging applications for pharmaceuticals and foods
  • Carbon Dioxide Barrier (CO2) is primarily important for carbonated beverages and mold retardation.
  • Chemical or hydrocarbon barrier (Odor & Flavor) is important for food as well as cosmetics packaging
  • Light Barrier is needed whenever light can alter the effect of gases on products

How does a Barrier Plastic work?


Polymer Crystallinity

  

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