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#SM321 Daflex Shrink/Melt Heavy Wall Adhesive Lined 3:1 Shrinkable Polyolefin Tubing
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Product Options
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SM321 Specification Sheet PDF
3:1 Shrink Ratio
Semi-Rigid Heavy Wall
Dual-Wall Adhesive-Lined
Flame Retardant Polyolefin Tubing
Applications
Daburn DAFLEX SM321 is a large size, heavier wall adhesive lined, large ratio, heat shrinkable tubing with a meltable adhesive liner. When 120°C is applied, the tubing will shrink to 1/3 of its supplied size. As the outer wall shrinks the inner adhesive liner melts and flows. When cooled, it offers protection for a variety of electrical applications such as insulating and sealing cable splices, terminations and jacket repairs as well as retrofitting. It provides “sealed-in” protection from chemicals and oils. DAFLEX SM321 also resists abrasion, UV radiation and is RoHS compliant.
Features
- Shrink ratio: 67% or more in the radial direction, 20% or less in the axial direction
- Continuous operating temperature: - 55°C (-67°F) to 125°C (230°F)
- Flammability: UL-VW-1, CSA OFT (except clear)
- High Carbon Black composition to resist UV radiation
- To UL 224 Standard
- RoHS Compliant
- Minimum Shrink Temperature: 120°C
Product Sizes and Dimensions
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Daburn
Item Number
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mm
size
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Expanded
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Recovered
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Internal Diameter (min.)
(D)
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Adhesive Inner Wall
(t)
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Internal Diameter (max.)
(d)
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Total Wall Thickness (Nominal)
(T)
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In.
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mm
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In.
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In.
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mm
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In.
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mm
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SM321-0.3”
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7
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0.3
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7.6
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0.0107
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0.100
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2.5
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0.050
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1.3
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SM321-0.4”
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10
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0.4
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10.2
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0.0134
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0.150
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3.8
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0.060
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1.5
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SM321-0.75”
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20
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0.75
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19.1
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0.0294
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0.22
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5.6
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0.105
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2.7
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SM321-1.1”
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28
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1.1
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27.9
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0.0348
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0.375
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9.53
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0.120
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3.1
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SM321-1.3”
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33
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1.3
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33.0
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0.0348
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0.375
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9.5
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0.120
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3.1
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SM321-1.5”
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38
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1.5
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38.1
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0.0410
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0.5
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12.7
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0.140
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3.6
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SM321-1.7”
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43
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1.7
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43.2
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0.0410
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0.5
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12.7
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0.155
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3.4
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SM321-2”
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51
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2.0
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50.8
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0.0375
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0.75
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19.1
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0.155
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3.4
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SM321-2.7”
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70
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2.7
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68.6
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0.0482
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0.90
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22.9
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0.155
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3.4
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SM321-3“
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76
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3.0
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76.2
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0.0353
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1.25
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31.8
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0.155
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3.4
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SM321-3.5”
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90
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3.5
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88.9
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0.0353
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1.25
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31.8
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0.155
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3.4
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SM321-4"
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100
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4.0
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101.6
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0.0455
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1.75
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44.5
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0.155
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3.4
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SM321-4.5”
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115
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4.5
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114.3
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0.0442
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1.75
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44.5
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0.170
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4.3
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SM321-5”
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130
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5.1
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130.0
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0.0442
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1.75
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44.5
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0.170
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4.3
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Standard Color: Black and Red (where indicated by -2). Please call for other colors.
All sizes sold in 4 foot lengths only.
Specification/Test Values
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Property
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Test Method
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Value
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Physical
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Unaged
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Tensile strength
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ASTM D638
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Min. 1,200 psi
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Elongation
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Min. 200%
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Aged
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Tensile strength
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ASTM D638
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Min. 1,000 psi
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Elongation
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Min. 100%
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Fluid
Resist.
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Tensile strength
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24°C /24 hrs
6 Fluids
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Min. 750 psi
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Dielectric strength
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Min. 200 Volts/Mil.
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Low temperature flex
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-55°Cx4hrs
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No cracks
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Heat shock
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225°Cx4 hrs.
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No cracks, flowing or dripping
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Secant Modulus
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ASTM D882
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Max. 25,000 psi
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Electrical
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Dielectric strength
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ASTM D2671
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Min. 200 Volts/Mil.
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Volume resistivity
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ASTM D876
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Min. 1 x 1013W - cm
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Chemical
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Copper corrosion
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121°C/16 hrs.
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No corrosion
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Fungus resistance
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ASTM G21
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No growth
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Water Absorption
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ASTM D570
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Max. 0.5
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Flammability
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ASTM D2671
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Pass
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