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Radiation Cross-linked Polyethylene Heat Shrinkable Waterproof Cap

Product Highlights

Model: JY-303

  • Pre-Formed Cap Shape — seamless, ready-to-install end sealing solution
  • High Mechanical Strength — radiation cross-linked polyethylene material
  • Excellent Durability — resistant to acid, alkali, corrosion, and aging
  • Strong Adhesion — specialized hot-melt adhesive for secure bonding
  • Superior Sealing — prevents water ingress and insulation layer damage
  • Customizable — sizes available upon request to fit various pipe diameters

Product Description

Radiation Cross-Linked Polyethylene Heat Shrinkable End Cap is a pre-formed, cap-shaped anti-corrosion sealing material manufactured by molding radiation cross-linked polyethylene pipe and laminating a specialized hot-melt adhesive on the inner surface. The radiation cross-linked material offers high mechanical strength, excellent durability, and resistance to acid, alkali, corrosion, and aging. The hot-melt adhesive provides strong bonding and reliable sealing performance. The product complies with GB/T 50538-2020 technical standard.

  • End sealing for thermal insulation and anti-corrosion pipes
  • Buried pipeline end protection
  • Above-ground pipeline end sealing
  • Prevention of insulation layer damage and water ingress at pipe ends
  • Various types of thermal insulation pipelines in district heating, oil, and gas networks

System Composition

The heat shrinkable end cap is a standalone sealing product designed for pipe end protection. It does not require primer or additional materials for installation.

  • Heat Shrinkable End Cap (JY-303): Positioned over the pipe end and heated to shrink tightly, forming a seamless, watertight seal that protects the pipe end and insulation layer from moisture and mechanical damage.

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
Adhesive Softening Point (°C)≥110
Peel Strength to Steel (23°C) (N/cm)≥50
Peel Strength to PE (23°C) (N/cm)≥50 (cohesive failure)
Shrinkage Ratio (%)≥15

Installation Guide & Precautions

Installation Methods

The heat shrinkable end cap is applied using a propane torch or heat gun. The cap shrinks tightly around the pipe end when heated, creating a seamless, watertight seal.

Quick Installation Steps

  1. Surface preparation: Clean the pipe end to remove dirt, oil, and moisture. Ensure the surface is dry and free of contaminants.
  2. Pipe end preheating: Preheat the pipe end to 75°C-85°C (or as specified by the manufacturer) to ensure proper adhesive flow.
  3. Position the cap: Slide the end cap over the pipe end. Ensure the cap covers the pipe end completely, with the cap edge overlapping the pipe coating by a minimum of 50mm.
  4. Heat shrinking: Using a propane torch, heat the cap evenly from the closed end toward the open end. Shrink the cap until the adhesive flows out slightly at the open end, ensuring a complete seal.
  5. Final inspection: Check for smooth coverage, no bubbles, wrinkles, or gaps. Ensure the cap is fully adhered to the pipe coating and the closed end is properly sealed.

Key Reminders

  • Do not overheat — excessive heat can burn the cap material. Keep the torch moving at all times.
  • Heat from the closed end — this ensures proper shrinking sequence and prevents air entrapment at the tip.
  • Overlap is critical — a minimum 50mm overlap over the pipe coating is essential for sealing integrity.
  • No primer required — the end cap comes with pre-applied hot-melt adhesive.
  • Storage: Keep in original packaging in a dry, cool area below 35°C, away from direct sunlight and heat sources.

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