3M Dual Wall Tubing has an outer wall that provides abrasion resistance and an inner wall that forms an environmental seal against moisture penetration. It is flame retardant, offers a choice of shrink ratios, and meets both UL/CSA specifications and military specifications.
3M MW 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.