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Typically they are made-up of two, three or four layers incorporating an aluminum or aluminum metallised film layer in the middle of the structure to provide the key barrier performance. Most frequently, the inner layer is made of polyethylene (PE), as it is readily heat-sealable and also prevents contact between the aluminum layer and the packaged contents. It also contributes to the robustness to the overall structure. This PE layer can be clear or pigmented, and there is a range of specific PE layers available which can offer further attributes such as; higher oil/grease resistance, or super-strong or quicker heat-sealing. The top/external layer of the laminate will typically be a transparent layer of Polyester or Nylon which gives high puncture resistance, and also adds a further barrier to gases.

In certain circumstances, a further (fourth) layer can be added between the foil and polyethylene layers to offer protection against especially sharp, or abrasive contents or provide added tear resistance.

Go to www.baltimoreinnovations.co.UK for further information

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Q: What are Barrier Foil Laminates made from?
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