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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, 110ºC 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 (2 75ºF), the inner meltable wall of the tubing is
simultaneously softened and force d 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 insulati ng barrier, highly resistant to penetration by
moisture and the introduction of chemicals and solvents. Adhesive reflow will occur
at temperatures above 80ºC (17 6ºF).
Agency Approvals &
Self Certifications
Meets requirements of:
• 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 splice s, breakouts,
connections, solder joint s, 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 mean s of print-wh eel
or hot-stamp techniques.
Shrink Ratio MW tubing has a 2.5:1 shrink ratio. When fully recovered, the tubing will shrink 40%
of its original diameter. The recovered wall thickness of the tubing is propo rtio nal to
the degree of recovery.
The operating temperature range is from -55º C (-67ºF) to 110ºC (230ºF), with a
shrink temperature minimu m of 135ºC (275ºF), and will withstand higher operat ing
temperatures for brief periods.
3M™ Heat Shrink Tubing MW
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Standard Sizes
and Dimensions
Ordering
Size
(Nominal)
Expanded I.D.
(Minimum) Recovered I.D.
(Maximum
Total Recovered
Wall Thickness
(Nominal)
Meltable
Recovered Wall
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)
Typical P ropert ies
Not for specifications. Values are typical, not to be considered minimum or maximum.
Properties measured at room temperature 73°F (23°C) unless otherwise stated.
Physical Property Typical Value
US units (metric)
Tensile Strength 2200 PSI
Ultimate Elongation 400%
Longitudinal Cha nge +1, -10%
Secant Modulus (2%) 27,000 PSI
Heat Aging (outer wall only)
168 hrs @ 175ºC
Elongation 175%
Heat shock (outer wall only)
4 hrs @ 250 ºC No dripping, flowing,
cracking
Low Temperature Flexibility (outer wall only)
4 hrs @ -55 ºC
No cracking
Electrical Property Typical Value
US units (metric)
Dielectric Strength 900 V/mil
Volume Resistivity 1015 ohm/cm
Chemical Property Typical Value
US units (metric)
Corrosion Resistance Non-corrosive
Fungus Resistance Non-nutrient
Water Absorption 0.1%
Fluid Resistance
JR4 Skydrol 600 Solution Gasoline
Hydraulic Fluid
>1500 PSI @ V/mil
@ 600 V/mil
3M™ Heat Shrink Tubing MW
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Important Notice
All statements, technical information, and recommendations related to 3M’s products are based on information
believed to be reliable, but the accuracy or completeness is not guaranteed. Before using this product, you must
evaluate it and determine if it is suitable for your intended application. You assume all risks and liability associated
with such use. Any statements related to the product, which are not contained in 3M’s current publications, or any
contrary statements contained on your purchase order, shall have no force or effect unless expressly agreed upon, in
writing, by an authorized officer of 3M.
Warranty; Limited
Remedy; Limited
Liability
This product will be free from defects in material and manufacture at the time of purchase. 3M MAKES NO OTHER
WARRANTIES INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE. If this product is defective within the warranty period stated above, your
exclusive remedy shall be, at 3M’s option, to replace or repair the 3M product or refund the purchase price of the 3M
product. Except where prohibited by law, 3M will not be liable for any indirect, special, incidental or
consequential loss or damage arising from this 3M product, regardless of the legal theory asserted.
3M is a trademark of 3M Company.
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Electrical Markets Division
6801 River Place Blvd.
Austin, TX 78726-9000
800 676.8381
FAX: 800 828.9329
www.3M.com/oem
Please recycle
© 3M 2011 All rights reserved
78-8129-9271-3 C
Standard Colors
Black
Also available in Blue, Clear, Red, Whit e and Yellow. Price, MOQ and Lead
Time will vary for these colors. Please contact Local Sales Representative or
Customer Service Representative for more information.
NOTE: The clear tubing is not flame retardant or UL listed.
Shelf Life & Storage
3M™ Heat Shrink Tubing MW has a 10-year shelf life from date of manufacture when
stored in a humidity controlle d storage (10°C/50°F to 27°C/80°F and <75% relative humidity).
Availability
Standard Packaging
Four-foot lengths. Cut pieces and other lengths (including spooled) are avai lable
subject to factory quotation.
Please contact your local distributor; av ailable from 3M.com/oem [Where to Buy] or
call 1-800-676-8381.
