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Radiation Cross-linked Polyethylene Heat Shrinkable Sleeve (Cylinder)

Product Highlights

Model: JY-302

  • Pre-Formed Cylindrical Shape — seamless, no longitudinal seam, easy positioning
  • High Mechanical Strength — radiation cross-linked polyethylene backing
  • Excellent Durability — resistant to corrosion, aging, and environmental stress cracking
  • Strong Adhesion — specialized hot-melt adhesive for secure bonding
  • Superior Sealing — excellent anti-corrosion performance
  • Compatible — works with 2LPE, 3LPE, FBE, and 2FBE coating systems

Product Description

Radiation Cross-Linked Polyethylene Heat Shrinkable Sleeve (Cylinder) is a pre-formed, seamless cylindrical sleeve manufactured from radiation cross-linked polyethylene sheet, coated with a specialized hot-melt adhesive on the inner surface. Compared to ordinary polyethylene, the radiation cross-linked backing offers higher mechanical strength, longer service life, and superior resistance to corrosion, aging, and environmental stress cracking. The hot-melt adhesive provides strong bonding and excellent sealing performance. The sleeve is fully compatible with 2-layer polyethylene (2LPE), 3-layer polyethylene (3LPE), FBE, and 2FBE coating systems.

  • Field joint coating for oil and gas pipelines
  • Weld seam corrosion protection for steel pipelines
  • Pipe repair and damage patching
  • Joint coating for petrochemical, power, metallurgy, and water supply pipelines
  • Pipeline sections requiring seamless, pre-formed sleeve protection

System Composition

The heat shrinkable sleeve (cylinder) is used as the primary anti-corrosion layer for pipeline field joints. For optimal performance, it should be applied over a solvent-free epoxy primer.

  • Solvent-Free Epoxy Primer (JY-401): Applied to the prepared weld area to enhance adhesion and provide additional corrosion protection to the steel substrate.
  • Heat Shrinkable Sleeve (Cylinder) (JY-302): Positioned over the primed weld area and heated to shrink tightly, forming a seamless, high-strength anti-corrosion seal.

Performance Index

Tensile Strength (MPa)≥17
Nominal Fracture Strain (%)≥400
Vicat Softening Point (°C)≥90
Brittleness Temperature (°C)≤-65
Volume Resistivity (Ω·m)≥1×10¹³
Environmental Stress Cracking Resistance (h)≥1000
Adhesive Softening Point (°C)≥110
Lap Shear Strength (23°C) (MPa)≥1.0
Lap Shear Strength (Max Operating Temp) (MPa)≥0.07
Peel Strength to Steel (23°C) (N/cm)≥50
Peel Strength to PE (23°C) (N/cm)≥50 (cohesive failure)
Cathodic Disbondment (65°C, 48h) (mm)≤5
Cathodic Disbondment (65°C, 28d) (mm)≤15
Impact Resistance (J)≥15
Shrinkage Ratio (Circumferential) (%)≥50

Installation Guide & Precautions

Installation Methods

The heat shrinkable sleeve (cylinder) is applied using a propane torch or heat gun. Unlike the lap-joint tape, the cylinder sleeve is pre-formed and seamless, requiring careful centering before shrinking.

Quick Installation Steps

  1. Surface preparation: Clean and blast the weld area to Sa2.5. Grind smooth any weld irregularities, sharp edges, or protrusions.
  2. Pipe preheating: Preheat the pipe around the weld to 75°C-85°C (or as specified by the primer manufacturer).
  3. Primer application: Apply solvent-free epoxy primer evenly to the prepared weld area. Ensure full coverage without missing spots.
  4. Position the sleeve: Slide the cylindrical sleeve over the pipe and position it centrally over the primed weld area. Ensure the sleeve overlaps both adjacent pipe coating ends by a minimum of 50mm each side.
  5. Heat shrinking: Using a propane torch, heat the sleeve evenly from the center outward. Shrink the sleeve until the adhesive flows out slightly at both ends, ensuring a complete seal. For large-diameter sleeves, two operators working from opposite sides is recommended.
  6. Final inspection: Check for smooth coverage, no bubbles, wrinkles, or lifted edges. Ensure the sleeve is fully adhered to the pipe and to the adjacent pipe coating.

Key Reminders

  • Do not overheat — excessive heat can burn the backing. Keep the torch moving at all times.
  • Shrink from the center — this prevents air entrapment and ensures a smooth, bubble-free finish.
  • Centering is critical — ensure the sleeve is properly centered over the weld before heating.
  • Primer must be applied — the heat shrinkable sleeve is not self-adhesive and requires a primer for proper adhesion to steel.
  • Compatibility — this sleeve is designed for use on steel pipes with 2LPE, 3LPE, FBE, or 2FBE coating systems.
  • Large-diameter pipes: Use multiple torches or two operators for even heating.
  • Storage: Keep in original packaging in a dry, cool area below 35°C, away from direct sunlight and heat sources.

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