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Q: What is a coextrusion?

A: A co-extrusion is a multi-layer extrusion. An initial tube is extruded and then a second tube is extruded over the existing tube. Often these materials are compatible so that the outer tube mechanically bonds to the inner tube. When the materials are not compatible, a tie layer is often required. This tie layer serves the purpose of bonding the outermost layer to the tie layer and then the innermost layer to the tie layer. This construction allows engineers to create unique structures that mechanically function differently inside and out.

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