Covalence HTLP Shrink Sleeves

     Covalence (formerly Raychem) offers a shrink sleeve system with the nomenclature
HTLP.  This originally stood for:  High Temp Low Preheat as the system utilizes an epoxy primer bonding agent which allows the system to be installed on a lower level of preheat.  HTLP sleeve systems can be installed by (generally) preheating steel and adjacent factory coating to 140F.

     Primarily available in the form of HTLP80; historically HTLP60 has been sold around the glove in large quantities.  The difference between those two product?  HTLP80 is rated for use on pipelines operating at up to 176F and HTLP60 is designed for 140F.  In recent years, Covalence has been fading out the HTLP60 material and standardizing HTLP sleeve systems use of HTLP80.  It is rated to a higher temperature; but otherwise practically indistinguishable - so why not?  

     So what is Covalence's HTLP pipeline coating system comprised of?  

1. Outermost layer is a heat shrinkable, radiation crosslinked polyolefin backing
2. Middle layer is a high shear hot melt adhesive
3. Primary corrosion coating is a two part epoxy primer bonding agent

     If you have further questions, let's talk about them!  936/321-3333