Key benefits — why you need this heat-shrink tubing Provides long-lasting, waterproof insulation for electrical connections, preventing corrosion and short circuits. Increases mechanical strength and strain relief for wires and joints, reducing failures from vibration and pulling. Fast, reliable repairs and clean installations with professional-looking results in seconds. Main features 2:1 shrink ratio — stated to reduce to one third of its original size when heated, improving fit and tightness over joints. Double-wall construction — outer polyolefin jacket for mechanical protection and flame retardancy; inner adhesive-lined layer melts to form a secure, waterproof seal. Flame-retardant and low-smoke material — made of polyolefin to resist ignition and limit smoke in fault conditions. Wide temperature tolerance — withstands extreme temperatures from -67 to 125.0 °C (-55 to 125 °C), suitable for many operating environments. Improved durability — designed to resist stretching and vibration, delivering higher tensile strength and longer service life. How it solves common problems Prevents moisture ingress at solder joints and connectors with a bonded, watertight seal. Protects repairs and splices from abrasion, chemicals, and mechanical stress. Organizes and bundles wiring to reduce clutter and minimize accidental pulls or shorts. Easy to use Slide the tubing over the connection, apply heat (heat gun, lighter or flame source), and watch the outer layer shrink while the inner adhesive flows to seal. Results in a neat, insulated joint within seconds without specialized tools. Compatibility and typical applications Compatible with wires, soldered joints, plugs, terminals, and connectors. Use cases: Automotive wiring repair and reinforcement of sensor, connector, and harness connections subject to vibration and weather. Marine and outdoor electrical work where waterproof sealing and corrosion protection are required. Electronics and home repairs: insulating solder joints, securing connector ends, and bundling small wire harnesses. Material and performance summary Material: Polyolefin outer jacket with meltable adhesive inner layer. Function: Insulation, waterproof sealing, strain relief, and mechanical protection. Performance: Flame-retardant, low smoke, resistant to vibration and stretching, and rated for extreme temperatures as listed above. Specifications Shrink ratio: 2:1 (described as reducing to one third of original size when heated) Construction: Double-wall (outer polyolefin, inner adhesive) Temperature range: -67 to 125.0 °C (-55 to 125 °C) This heat-shrink tubing provides a practical, durable solution for insulating, sealing, and protecting electrical connections in automotive, marine, and general electrical applications.