3M 7010398848 Heat Shrink Tubing 1/2 in 48 in Blue

Product Description

The 3M 7010398848 is a multiple-wall, semi-rigid heat shrink tubing designed for electrical insulation, strain relief, and environmental sealing applications. Manufactured from co-extruded polyolefin with selective cross-linking, it features a 2.5:1 shrink ratio and an integral meltable inner wall that flows when heated to create a moisture-resistant seal around wire terminations and splices. Each stick measures 48 inches in length with a 1/2 inch recovered diameter and is blue in color for circuit identification. Licensed electricians and electrical assemblers use this tubing in wire harness fabrication, panel wiring, and field repair work.

This tubing is suited for residential and commercial electrical installations, industrial wiring assemblies, and marine or outdoor environments where moisture ingress is a concern. The meltable inner wall bonds to wire jackets and connector barrels during the heat shrink process, reducing the need for additional sealant steps. It is commonly used on wire bundles, terminals, and connector backshells where both mechanical protection and environmental sealing are required in a single installation step.

Key Features

• 2.5:1 shrink ratio provides secure fit across a range of wire and connector diameters
• Co-extruded semi-rigid polyolefin construction with integral meltable inner wall for environmental sealing
• 48-inch stick length allows field cutting to required lengths without waste
• Blue color for circuit identification and organization
• Selectively cross-linked outer wall maintains structural rigidity after recovery

Compatibility

Designed as an OEM-style heat shrink tubing solution for electrical wiring assemblies requiring dual-wall construction with an adhesive-lined inner wall for moisture and environmental protection.

Installation Notes

Installation is performed by licensed electricians or qualified electrical assemblers following applicable NEC guidelines. De-energize all circuits before applying heat shrink tubing to live wire assemblies. Use a calibrated heat gun set to the appropriate temperature range for polyolefin tubing; open flame torches are not recommended as they can damage the tubing or underlying insulation. Ensure even heat distribution along the full length of the tubing during recovery to allow the inner wall to flow uniformly.

Technical Specifications

• Shrink Ratio: 2.5:1
• Wall Type: Multiple-wall, semi-rigid with meltable inner wall
• Material: Polyolefin (co-extruded, selectively cross-linked)
• Recovered Diameter: 1/2 inch
• Length: 48 inches per stick
• Color: Blue
• Weight: 0.11 pounds
• Unit of Measure: Each
• Minimum Order Quantity: 75
• UPC: 10051128597481

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7010398848