3M™ Heat Shrink Multiple-Wall Semi-Rigid Polyolefin Tubing is a 2.5:1 semi-rigid, heat shrinkable polyolefin tubing that is co-extruded and selectively cross-linked to provide an integral, meltable inner wall.
When heated in excess of 135ºC (275ºF), the inner meltable wall of the tubing is simultaneously softened and forced by the shrink action into intimate contact with all underlying surfaces, interstices and small voids.