Importance

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Abstract

The present disclosure provides a dual layer heat shrink tube having: an inner polymeric layer with a thickness t₁ and an outer diameter D₁; and an outer, expanded polymeric layer with a thickness t₂′ and an outer diameter D₂′ obtained by expanding a polymer tube from D₂ to D₂′ and t₂ to t₂′ at a selected temperature so that D₂′-2 (t₂′)>D₁, wherein a ring cut from a cross-section of the dual layer heat shrink tube, slit into a rectangle and gripped at cut ends by tension grips within a DMA, and subjected to a temperature sweep of 3° C./min at a frequency of 1 Hz from the onset of a melting endotherm of the inner polymeric layer to that of the outer, expanded polymeric layer is greater than 1° C. and less than 12° C. The disclosure further provides associated methods for preparing and using such tubes, as well as to products comprising such tubes.

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First Claim