Cut Sheet

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Heat Shrink Tubing SFTW-203
Very Flexible Polyolen; Shrink Ratio 3:1
Product description
3M™ Heat Shrink Tubing SFTW-203
is a 3:1 shrink ratio tubing that offers
an outstanding balance of electrical,
physical and chemical properties for a
wide variety of industrial and military
applications. SFTW-203 tubing is
made of very exible, heat-shrinkable
polyolen which is mechanically tough,
chemically resistant, and can be easily
surface printed.
SFTW-203 tubing has been engineered
to offer a low shrink temperature of
100°C (212°F). This allows the tubing
to shrink rapidly, and minimizes heat
exposure and possible damage to
temperature sensitive substrates.
SFTW-203 tubing meets the
performance requirements of AMS-
DTL-23053/5* Class 1 and is UL
Recognized (File No. E48398) for ame
retardance. It is rated for continuous
operation from –55°C (–67°F) to
135°C (275°F), and withstands elevated
temperatures of 300°C (572°F) for
brief periods.
Typical applications
The extra exibility and low shrink
temperature of SFTW-203 tubing
make it ideal for shrink-t jacketing
and insulation of exible wire bundles
and temperature sensitive components.
The 3:1 shrink ratio makes SFTW-203
tubing the insulation of choice for end
terminations where the connector body
is larger than the cable and for repair
applications where the tubing must be
slid over a connector. SFTW-203 tubing
can also be used to insulate an oversized
component in line to the wiring.
Shrink ratio
SFTW-203 tubing has a 3:1 shrink ratio.
When freely recovered, the tubing will
shrink to 33% of its as-supplied internal
diameter. The recovered wall thickness
of the tubing is proportional to the degree
of recovery.
Standard colors
Black.
Standard packaging
Boxes of four-foot lengths, or large
spools. Cut pieces subject to factory
quotation.
Ordering information
Order SFTW-203 tubing by product
name, size equivalent to expanded inner
diameter, color, and package type. Always
order the largest size that will shrink-t
snugly over the item to be covered.
Example: SFTW-203 tubing, 1/2",
black, 4 ft. lengths.
Physical
Tensile Strength 2600 PSI
Ultimate Elongation 400%
Longitudinal Change ±5%
Secant Modulus
(2% elongation) 8700 PSI
Specic Gravity 1.29
Heat Shock No cracking,
(4 hrs. @ 250°C) owing
or dripping
Water Absorption 0.2%
Heat Aging Elongation
(168 hrs. @ 158°C) 350%
Low Temperature Flexibility
(4 hrs. @ –55°C) No cracking
Flammability Self extinguishing
Electrical
Dielectric Strength 700 V/mil
Volume Resistivity 10
15
ohm-cm
Chemical
Corrosive effect Non-corrosive
Solvent Resistance
Tensile Strength 1100 PSI
Dielectric Strength 400 V/mil
Fungus Resistance Inert
Recovered
Wall
Ordering Expanded I.D. Recovered I.D. Thickness
Size (Minimum) (Maximum) (Nominal)
in. in. (mm) in. (mm) in. (mm)
1/16 .059 (1,5) .020 (0,5) .018 (0,45)
1/8 .118 (3,0) .039 (1,0) .022 (0,55)
1/4 .236 (6,0) .079 (2,0) .026 (0,65)
3/8 .354 (9,0) .118 (3,0) .030 (0,75)
1/2 .472 (12,0) .157 (4,0) .030 (0,75)
3/4 .709 (18,0) .236 (6,0) .033 (0,83)
1 .945 (24,0) .315 (8,0) .039 (1,00)
1-1/2 1.535 (39,0) .512 (13,0) .045 (1,15)
Typical PropertiesStandard Sizes and Dimensions
Technical information provided consists of typical product data and
should not be used for specication purposes. Unless otherwise
noted, all tests are performed at room temperature.
Applicable Specication
UL File E48398; CSA LR 38227; Meets
functional requirements of SAE-AMS-DTL
23053/5, Class 1
Note: Dimensions in inches are approximate.