Seal For Life (former Raychem) official distributor, Tesi provides a wide range of heat shrink sleeves for long term corrosion protection and strong mechanical strength performance for oil, gas and water pipelines.

Covalence® corrosion protection products offer a broad range of field joint coating solutions based on an irradiated cross-linked polyolefin backing combined with a hot melt or mastic pressure sensitive adhesive.

Covalence heat shrink sleeves meet all relevant global standards (ISO, EN, AWWA, NACE, GOST) ensuring suitability for pipeline applications and special field conditions.
Covalence sleeves come in various thicknesses and can accommodate any diameter pipe.
Easy-to understand installation instructions are shipped with every product and clear product labeling allows rapid on-site identification. 

Covalence sleeves are offered in a two-layer and three-layer construction that compliment a wide range of pipe coating applications both onshore and offshore. 

Two-Layer Heat Shrink Sleeve System
The Covalence two-layer sleeve system consists of a first layer of a mastic pressure sensitive adhesive and a second layer of irradiated cross-linked polyethylene backing. The two-layer system is widely used with FBE, coal tar, epoxy, polyurethane and PE tape mainline coatings. Wire brush cleaning is suitable for all Covalence two-layer systems.       

Three-Layer Heat Shrink Sleeve System
The Covalence three-layer sleeve system consists of an initial epoxy primer layer with a second layer of a hot melt adhesive and a top layer of irradiated cross-linked polyethylene or polypropylene backing. Covalence three-layer sleeves are designed for use with three-layer PE or PP mainline coatings. Blast cleaning is required for Covalence three-layer systems.                                      

Covalence heat shrink sleeves Features and Benefits

• 40+ years of proven in-service performance


• Mastic-coated sleeves balance performance, economy and ease of installation

• Excellent resistance to cathodic disbondment, hot water immersion, thermal aging and soil stress at maximum-rated operating temperature


• Dimpled pattern provides a “permanent change” indicator for proper heat application

• Systems conform to all pipe diameters


• Costi di installazione efficace 

• Primer-less application for two-layer sleeves


• Three-layer sleeves may be installed directly over wet epoxy primer

• Products available in uni-sleeve construction with preattached closure patch


• Three-Layer sleeves perform at elevated pipe operating temperatures and high soil stress conditions 

field joint coating catalogue cove

      Discover Covalence corrosion protection range in Tesi brochure:

      Click here to download pdf version

      Click here to browse the online version