3M Heat Shrink Tubing MW Adhesive-Lined, 2.5:1, Semi-Rigid, Polyolefin Data Sheet September 2011 Description 3M Heat Shrink Tubing MW is a semi-rigid, 110C heat-shrinkable polyolefin tubing that is co-extruded and selectively cross-linked to provide an integral, meltable inner wall. When heated in excess of 135C (275F), 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. Upon cooling, the MW tubing provides a tough protective and insulating barrier, highly resistant to penetration by moisture and the introduction of chemicals and solvents. Adhesive reflow will occur at temperatures above 80C (176F). Agency Approvals & Meets requirements of: Self Certifications SAE-AMS-DTL-23053/4, Class 1* AMS-3634 UL Listed, UL File E-157227 *Formerly MIL-DTL-23053/4, Class 1 Applications Applications for MW tubing include braided-shield pigtails, electrical wiring, mechanical assemblies, electronic components, electrical wire splices, breakouts, connections, solder joints, delicate wire terminations, end-sealing of electrical cables and rigid tubings. For installation that may require rework, retrofit or repair in the field, MW tubing offers the extra advantage of easy removability. For circuit and component identification purposes, the tubings readily accept marking by means of print-wheel or hot-stamp techniques. MW tubing has a 2.5:1 shrink ratio. When fully recovered, the tubing will shrink 40% Shrink Ratio of its original diameter. The recovered wall thickness of the tubing is proportional to the degree of recovery. The operating temperature range is from -55C (-67F) to 110C (230F), with a shrink temperature minimum of 135C (275F), and will withstand higher operating temperatures for brief periods. 1 of 3 3 3M Heat Shrink Tubing MW Standard Sizes and Dimensions Ordering Total Recovered Meltable Expanded I.D. Recovered I.D. Size Wall Thickness Recovered Wall (Minimum) (Maximum (Nominal) (Nominal) Thickness In. (mm) In. (mm) In. (mm) In. (mm) 1/8 .125 (3,18) .023 (0,58) .038 (0,97) .020 (0,51) 3/16 .187 (4,75) .060 (1,52) .043 (1,09) .025 (0,64) 1/4 .250 (6,35) .080 (2,03) .047 (1,19) .027 (0,69) 3/8 .375 (9,53) .13 (3,43) .050 (1,27) .030 (0,76) 1/2 .500 (12,70) .195 (4,95) .055 (1,40) .035 (0,89) 3/4 .750 (19,05) .313 (7,95) .065 (1,65) .040 (1,02) 1 1.000 (25,40) .400 (10,16) .075 (1,91) .040 (1,02) Not for specifications. Values are typical, not to be considered minimum or maximum. Typical Properties Properties measured at room temperature 73F (23C) unless otherwise stated. Typical Value Physical Property US units (metric) Tensile Strength 2200 PSI Ultimate Elongation 400% Longitudinal Change +1, -10% Secant Modulus (2%) 27,000 PSI Heat Aging (outer wall only) 168 hrs 175C Elongation 175% Heat shock (outer wall only) No dripping, flowing, 4 hrs 250 C cracking Low Temperature Flexibility (outer wall only) 4 hrs -55 C No cracking Typical Value Electrical Property US units (metric) Dielectric Strength 900 V/mil 15 Volume Resistivity 10 ohm/cm Typical Value Chemical Property US units (metric) Corrosion Resistance Non-corrosive Fungus Resistance Non-nutrient Water Absorption 0.1% Fluid Resistance JR4 Skydrol 600 Solution Gasoline >1500 PSI V/mil Hydraulic Fluid 600 V/mil 2 of 3