SR-350 Tubing
Semi-Rigid Polyolefin
Data Sheet
Product Description
3M
™
SR-350 is a semi-rigid, heat-
shrinkable tubing that offers superior cut-
through and abrasion-resistance
characteristics for optimum mechanical
performance. In addition, SR-350 Tubing
has excellent electrical-insulation and
chemical-resistance properties.
SR-350 Tubing meets the
requirements of MIL-DTL-23053/6,
Class 1 & 2, AMS-3638 and AMS-3639.
It is UL Recognized at 600 volts @
125°C (UL File Nos. E-39100 and E-
69751).
SR-350 Tubing is rated for
continuous operation from –55°C
(–67°F) to 135°C (275°F) and withstands
operating temperatures to 300°C (572°F)
for short periods. Minimum shrink
temperature for all SR-350 Tubing is
135°C (275°F).
Typical Applications
SR-350 Tubing is ideally suited for
strain-relief applications, wire marking
and protective covering and packaging of
delicate components. It is widely used for
insulating mechanically weak or damage-
susceptible points such as solder joints,
wire splices and terminations.
Because it holds its expanded
“roundness,” SR-350 Tubing is highly
recommended for use with automatic
feed equipment. The tubing is readily
printable by hot-stamp or print-wheel
techniques.
Standard Colors
SR-350, Class 1 (flame retardant) –
black. Special color-coded sizes are
available. SR-350, Class 2 (non-flame
retardant) – clear.
Standard Packaging
Four-foot lengths. Cut pieces available
subject to factory quotation.
Ordering Information
Order SR-350 by product name, size
equivalent to expanded inside diameter,
package type and color. Always order the
largest size that will shrink snugly over
the item to be covered.
Example: SR-350, 1/4" 4 ft., black.
,
Shrink Ratio
SR-350 Tubing has a 2:1 shrink ratio.
When freely recovered, the tubing will
shrink to 50% of its as-supplied internal
diameter. The recovered wall thickness of
the tubing is proportional to the degree of
recovery. High expansion-ratio SR-350
Tubing is available subject to factory
quotation.
Typical Properties
Applicable Specification
MIL-DTL-23053/6, Class 1, 2; AMS-3638, AMS-3639;
UL File E-39100, E-69751
Standard Sizes and Dimensions
Recovered
Wall
Thickness
(Nominal)
in.
(mm)
.020
.020
.020
.020
.025
.025
.030
.030
(0,51)
(0,51)
(0,51)
(0,51)
(0,64)
(0,64)
(0,76)
(0,76)
Physical
Tensile Strength
2600 PSI
Ultimate Elongation
400%
Longitudinal Change
±5%
Secant Modulus
(2%)
28,000 PSI
Specific Gravity
1.25 (Black)
.95 (Clear)
Heat Aging
Elongation
(336 hrs. @ 175°C)
175%
Heat Shock
No dripping,
(4 hrs. @ 250°C)
cracking,
passes mandrel
wrap test
Low Temperature Flexibility
(4 hrs. @ –55°C) No cracking
Flammability
Self-extinguish
(Class 1 only)
Electrical
Dielectric Strength
800 V/mil
Volume Resistivity 10
15
ohm-cm
Ordering
Size
3/64
1/16
3/32
1/8
3/16
1/4
3/8
1/2
Expanded I.D.
(Minimum)
in.
(mm)
.046
.063
.093
.125
.187
.250
.375
.500
(1,17)
(1,60)
(2,36)
(3,18)
(4,75)
(6,35)
(9,53)
(12,70)
Recovered I.D.
(Maximum)
in.
(mm)
.023
.031
.046
.062
.093
.125
.187
.250
(0,58)
(0,79)
(1,17)
(1,57)
(2,36)
(3,18)
(4,75)
(6,35)
Chemical
Corrosive Effect Non-corrosive
Solvent Resistance
Tensile Strength
1600 PSI
Dielectric Strength
400 V/mil
Water Absorption
0.2%
Fungus Resistance Non-nutrient
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.
Limited Warranty
– 3M expressly warrants that for a period of ninety days from the date of purchase, 3M static control products will be free of defects in
materials (parts) and workmanship (labor). Defects occurring during the warranty period will be repaired or products will be replaced at 3M’s option and
expense, if 3M receives notice during the warranty period. Defective products must be returned to 3M with proof of purchase date.
Warranty Exclusions
– THE FOREGOING EXPRESS WARRANTY IS MADE IN LIEU OF ALLOTHER PRODUCT WARRANTIES, EXPRESS AND IMPLIED,
INCLUDING FITNESS AND MERCHANTIBILITY. The express warranty will not apply to defects or damage due to accidents, neglect, misuse, alterations,
operator error, or failure to properly maintain, clean, or repair products.
Limit of Liability
– In no event will 3M or Seller be responsible or liable for special, incidental, or consequential losses or damages, whether based in tort or
contract. Fulfillment of 3M’s warranty obligations will be Customer’s exclusive remedy and 3M’s and Seller’s limit of liability for any breach of warranty or otherwise.
For your nearest distributor or to order, call 1-800-328-1368
3M Electrical Specialties Division
6801 River Place Blvd.
Austin, TX 78726-9000
© 3M March 1997
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