3M™ Heat Shrink Multiple-Wall Polyolefin Tubing EPS-400 offers superb environmental protection for electronic components, wire splices, wire bundles and harness breakouts.3M Heat Shrink Multiple-Wall Polyolefin Tubing EPS-400 is medium-wall, semi-rigid tubing that offers the advantages of integral, adhesive-lined construction. The tubing is made from flame-retardant, flexible polyolefin with an internal layer of special thermoplastic adhesive. The heat-shrinkable outer wall is selectively cross-linked, while the adhesive maintains high flow and excellent adhesion characteristics. When heated in excess of 121C (250F), 3M Heat Shrink Multiple-Wall Polyolefin Tubing EPS-400 rapidly shrinks to a skin-tight fit, forcing the melted adhesive to flow and cover the substrate. Upon cooling, the adhesive solidifies, forming a permanent, non-drying, flexible and water-resistant barrier. Adhesive reflow will occur at temperatures above 80C (176F). The tubing is also UL Recognized (file E-157227).