Heat-shrink tubing Cabletech 3.5 mm × 1 m, black, model LEC-NAR0246.1

Heat-shrink tubing Cabletech 3.5 mm × 1 m in black is a flexible polyolefin sleeve designed to shrink uniformly when heated, creating a compact insulating layer around wires and cable joints. The product provides electrical insulation, mechanical protection and strain relief for soldered connections, cable repairs and small wiring harnesses. Its 3.5 mm nominal diameter before shrinking and 1 m length make it suitable for multiple repair or assembly operations in workshops, hobby electronics and professional wiring tasks.

Advantages

The tubing offers consistent heat-shrink performance with good dimensional stability and tight adhesion to irregular shapes after shrinking. Its black colour provides discreet protection and light-blocking for sensitive connections. The material resists abrasion and provides mechanical reinforcement at transition points, reducing risk of wire fatigue and connector failure while maintaining a low-profile finish.

Suitable for

• Insulating soldered joints and exposed conductors in electronics projects
• Repairing damaged cable sheaths and covering splices
• Providing strain relief at connector exits and terminal points
• Bundling small harnesses and identifying protected runs

Key specifications

• Material type: heat-shrink polyolefin
• Nominal diameter before shrink: 3.5 mm
• Length: 1 m
• Colour: black
• Shrink ratio: standard (typical 2:1—designed to conform to irregular shapes after heating)
• Primary functions: electrical insulation, mechanical protection, strain relief

How to use

Cut a suitable length of tubing to cover the exposed area plus a margin on either side. Slide the tubing over the wire or joint before soldering where practical, or position it over the repaired section. Apply even heat using a heat gun, lighter with care, or a soldering iron with a heat-shrink nozzle, moving the heat source along the tubing to ensure uniform shrinking. Continue heating until the tubing has visibly contracted and conforms tightly to the underlying components; avoid overheating that could char adjacent materials.

Usage recommendations

For best results, use a temperature-controlled heat gun set to the manufacturer's recommended range for polyolefin tubing. Ensure surfaces are clean and free of oils or solvents before applying. For strain relief applications, select slightly longer pieces to extend over connector bodies and adjacent cable insulation. When working near heat-sensitive components, shield them or apply heat in short intervals to prevent damage.