Shrink Sleeve Backing Properties: Part 2

Backing Properties of Shrink Sleeves:  Part 2

     Yesterday we started looking at this topic, primarily considering the different types of heat shrinkable backings and the practical aspects of the different characteristics under which a backing can be evaluated.  (Backing Properties of shrink sleeves: Part 1 can be found here).

     Today, we are going to look at the physical properties of the backing on two different Covalence shrinkable sleeve products:  WPC120 and WPC100M.  As a quick overview, WPC120 is a shrink sleeve rated for use on pipelines operating at elevated temperatures (up to 120C / 251F).  WPC100M is a heat shrink sleeve system that is used on pipelines that will operate at up to 120C / 212F.  In some ways, two specialized products....but in other ways, examples of the product quality that is available in the Covalence heat shrinkable product line.

WPC120 Backing Properties

Tensile Strength - ASTM D-638 - 2700 psi @ 23C / 660 PSI @ 120C

Elongation - ASTM D-638 - 580% @ 23C / 560% @ 120C

Shore D Hardness - ASTM D-2240 - 57

Shrink Force - ASTM D-638 (150C) - 45 psi

Dielectric Strength - ASTM D-149 - 800 volts/mil

Moisture Absorption - ASTM D-570 - .04%

Impact Resistance - ASTM G-14 - 75 in-lbs

Penetration Resistance - ASTM G-17 - No Holiday with 12kV detector @ 120C

WPC100M Backing Properties

Tensile Strength - ASTM D-638 - 3400psi

Elongation - ASTM D-638 -350%

Shore D Hardness - ASTM D-2240 - 55

Shrink Force - ASTM D-638 (150C) - 40 psi

Dielectric Strength - ASTM D-149 - 1000 volts/mil

Moisture Absorption - ASTM D-570 - .04%

Impact Resistance - ASTM G-14 - 50 in-lbs

Penetration Resistance - ASTM G-17 - No Holiday with 10kV detector @ 80C