TE Connectivity Raychem MWTM Medium Wall Heat Shrink Tubing
This product is a Raychem MWTM series medium wall, heat shrinkable insulation sleeve manufactured by TE Connectivity.
The Raychem MWTM tubing is engineered for the environmental sealing, electrical insulation, and mechanical protection of low voltage power cables, joints, and terminations. It features a tough cross linked polyolefin material combined with an internal hot melt adhesive lining, providing reliable resistance against moisture ingress, UV degradation, and structural wear in both underground and exposed outdoor applications.
Key Features
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Advanced Cross Linked Polymer Compound: Fabricated from high performance, radiation cross linked polyolefin material. This structural formulation ensures it will not melt or flow at high operational temperatures, providing long term mechanical strength and abrasion resistance.
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Co Extruded Hot Melt Adhesive Lining: Equipped with an internal layer of thermoplastic adhesive that melts during the shrinking process. This adhesive layer flows into cable gaps and surface irregularities to establish a completely waterproof, moisture resistant barrier that protects against environmental corrosion.
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High Shrink Ratio Adaptability: Offers an optimal expansion ratio (approximately 3:1) that allows the tubing to pass easily over bulky cable connectors or lugs and then shrink tightly onto smaller cable diameters.
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Excellent Electrical Insulation Properties: Delivers a high dielectric strength rating, making it safe for direct use as a primary insulation jacket on low voltage applications up to 1 kV and as a resealing sleeve on medium voltage accessories.
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UV and Weathering Resistance: Highly resistant to ultra violet radiation, chemical exposure, ozone breakdown, and localized impact stresses, making it suitable for direct buried, underwater, or outdoor open air cable routing.
Dimensional Overview
The Raychem MWTM series follows standard sizing metrics where the first number represents the minimum expanded internal diameter, the second number represents the maximum fully recovered internal diameter, and the trailing suffix indicates the precut sleeve length (in millimeters):
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Sizing Options Configuration:
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MWTM 25/8-1500: Expands to a minimum of 25 mm and recovers tightly down to a maximum of 8 mm, supplied in a standard 1500 mm (1.5 meter) length.
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MWTM 35/12-1500: Expands to a minimum of 35 mm and recovers tightly down to a maximum of 12 mm, supplied in a standard 1500 mm (1.5 meter) length.
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Technical Specifications
| Feature | Specification |
| Product Series | Raychem MWTM (Medium Wall Tubing) |
| Brand / Manufacturer | TE Connectivity |
| Material Composition | Cros linked polyolefin (Halogen free) |
| Inner Protection Mechanism | Co extruded polyamide hot melt adhesive lining |
| Shrink Ratio Profile | Approximately 3:1 |
| Voltage Performance Class | Rated for primary insulation up to 1 kV (1000V AC/DC) |
| Minimum Recovery Temperature | +120 degrees Celsius (Using standard industrial propane gas torch or hot air blower) |
| Operating Temperature Limits | Continuous performance from -55 degrees Celsius to +110 degrees Celsius |
| Standard Outer Casing Color | Black |
| Compliance Standards | IEC 60684-3-214, CENELEC HD 623, RoHS Compliant |
Applications
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Low Voltage Cable Jointing: Serves as the outer protective jacket or inner insulation sleeve on inline underground cable splice kits up to 1 kV.
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Cable Repair and Resealing: Used to repair punctures, deep cuts, and gouges on damaged outer PVC or PE cable sheaths, preventing water entry from causing phase to earth faults.
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Conduit and Service Entrance Protection: Seals the entry points where utility cables pass into steel or plastic conduits, blocking rain, dirt, and rodents from infiltrating distribution panels.
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Industrial Automation Protection: Protects heavy cable terminal assemblies, busbar splices, and exposed connector lugs inside automated manufacturing plants and water processing facilities against corrosive environments.
