Shrink Sleeve Closure Zippers

 Shrink Sleeve Closures - WPCPIV

Both Sides of a Covalence WPCPIV Closure Strip

     Every single wrap around shrink sleeve must have a closure strip in order for there to be a proper installation.  The sole purpose of the closure strip is to hold the sleeve in the shape of a tube as it shrinks down the conform to the substrate.  The closure strip (WPCPIV) has absolutely no coating or corrosion prevention function.

     If a wrap around shrink sleeve were used and a WPCPIV closure strip was not used; as the sleeve began shrinking, it would simply fall off of the pipe onto the ground.  

     As you can see in the above picture, the checkered side is the high shear adhesive side.  That is the side that goes down onto the shrink sleeve and prevents the sleeve from pulling away.  The bottom black side is simply the outer PE jacket which acts as the vehicle for getting the adhesive in place.

     Typically purchased in 4" sections, the closure strip would be wide enough to match the width of whatever wrap around shrink sleeve you are installing.  In some cases of large OD pipe; closures as large as 6", 8" or even 12" could be used.  We can make any size you need!