Product Description
3 M
™
S F T W-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 is
made of very flexible, heat-shrinkable
polyolefin which is mechanically tough,
chemically resistant, and can be easily
surface printed.
S F T W-203 tubing has been
engineered to offer a low shrink
temperature of 100°C (212°F). T h i s
allows the tubing to shrink rapidly, and
minimizes heat exposure and possible
damage to temperature sensitive
s u b s t r a t e s .
S F T W-203 tubing meets the
performance requirements of MIL-DTL-
23053/5 Class 1, and is ULR e c o g n i z e d
(File No. E48398) for flame 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.
SFTW-203 Tubing
3:1 Very Flexible Polyolefin
Data Sheet
Typical Applications
The extra flexibility and low shrink
temperature of SFTW-203 tubing make it
ideal for shrink-fit jacketing and
insulation of flexible wire bundles and
temperature sensitive components. T h e
3:1 shrink ratio makes SFTW-203 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
c o n n e c t o r. SFTW-203 can also be used
to insulate an oversized component in
line to the wiring.
Shrink Ratio
S F T W-203 has a 3:1 shrink ratio. W h e n
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
r e c o v e r y.
Standard Colors
B l a c k .
Standard Packaging
Boxes of four-foot lengths, or larg e
spools. Cut pieces subject to factory
q u o t a t i o n .
Ordering Information
Order SFTW-203 by product name, size
equivalent to expanded inner diameter,
c o l o r , and package type. Always order
the largest size that will shrink-fit snugly
over the item to be covered.
Example: SFTW-203, 1/2", black, 4 ft
l e n g t h s .
R e c o v e re d
Wall
Ordering Expanded I.D. R e c o v e red I.D. T h i c k n e s s
S i z e ( M i n i m u m ) ( M a x i m u m ) ( N o m i n a l )
i n . ( m m ) i n . ( m m ) i n . ( m m )
1 / 1 6 . 0 5 9 ( 1 , 5 ) . 0 2 0 ( 0 , 5 ) . 0 1 8 ( 0 , 4 5 )
1 / 8 . 11 8 ( 3 , 0 ) . 0 3 9 ( 1 , 0 ) . 0 2 2 ( 0 , 5 5 )
1 / 4 . 2 3 6 ( 6 , 0 ) . 0 7 9 ( 2 , 0 ) . 0 2 6 ( 0 , 6 5 )
3 / 8 . 3 5 4 ( 9 , 0 ) . 11 8 ( 3 , 0 ) . 0 3 0 ( 0 , 7 5 )
1 / 2 . 4 7 2 ( 1 2 , 0 ) . 1 5 7 ( 4 , 0 ) . 0 3 0 ( 0 , 7 5 )
3 / 4 . 7 0 9 ( 1 8 , 0 ) . 2 3 6 ( 6 , 0 ) . 0 3 0 ( 0 , 7 5 )
1 . 9 4 5 ( 2 4 , 0 ) . 3 1 5 ( 8 , 0 ) . 0 3 9 ( 1 , 0 0 )
1 1/2 1 . 5 3 5 ( 3 9 , 0 ) . 5 1 2 ( 1 3 , 0 ) . 0 4 5 ( 1 , 1 5 )
Standard Sizes and Dimensions
Note: Dimensions in inches are approximate.
P h y s i c a l
Tensile Strength 2600 PSI
Ultimate Elongation 4 0 0 %
Longitudinal Change ± 5 %
Secant Modulus
(2% elong.) 8700 PSI
Specific Gravity 1 . 2 9
Heat Shock No cracking,
(4 hrs. @ 250°C) f l o w i n g
or dripping
Water A b s o r p t i o n 0 . 2 %
Heat Aging E l o n g a t i o n
(168 hrs. @ 158°C) 3 5 0 %
Low Temperature Flexibility
(4 hrs. @ –55°C) No cracking
F l a m m a b i l i t y Self extinguishing
E l e c t r i c a l
Dielectric Strength 700 V/mil
Volume Resistivity 1 0
1 5
o h m - c m
C h e m i c a l
Corrosive eff e c t N o n - c o r r o s i v e
Solvent Resistance
Tensile Strength 1100 PSI
Dielectric Strength 400 V/mil
Fungus Resistance I n e r t
Typical Properties
Technical information provided consists of typical product data and
should not be used for specification purposes. Unless otherwise
noted, all tests are performed at room temperature.
Applicable Specifications
MIL-DTL-23053/5, Class 1; ULFile E48398;
C S A LR 38227
