4:1 White Adhesive Glue-Lined Heat Shrink Tubing – Waterproof Sleeving

Measure the outer diameter of the wire bundle or connector before shrinking. With a 4:1 ratio, the tubing shrinks to one-quarter of its supplied diameter. For example, Φ8mm tubing will shrink down to approximately 2mm. Choose a size where the supplied diameter is at least 1.1–1.5× the diameter of the object you are covering to ensure a snug, sealed fit. When in doubt, size up — you can always apply more heat to achieve a tighter wrap, but you cannot stretch tubing that is too small.

A 4:1 shrink ratio means the tubing will shrink to approximately 25% of its original inner diameter when heat is applied. This is significantly more than standard 2:1 tubing, making it suitable for irregular shapes, connectors with flanges, and applications where a very tight seal is needed. For a straight wire splice, 2:1 tubing may be sufficient; for a bulky connector body or a stepped profile, 4:1 is generally the better choice.

The dual-wall construction — a polyolefin outer layer combined with a thermoplastic adhesive inner lining — generally provides good mechanical protection and resistance to abrasion. The adhesive layer bonds to the substrate, adding strain relief that helps withstand vibration typically encountered in automotive and marine applications. For extreme mechanical stress (e.g., constant flexing), consider adding a secondary mechanical clamp or conduit.

Yes. The glue-lined construction creates a watertight seal around the wire or connector, and the polyolefin outer wall generally offers good resistance to UV exposure, moisture, and mild chemicals. It is commonly used in marine wiring, outdoor lighting, and irrigation control systems. For submersion or continuous water exposure, verify the specific IP rating or contact us to confirm suitability for your application.

Adhesive-lined polyolefin heat shrink tubing typically activates at around 120–135°C (248–275°F) and the adhesive flows fully at approximately 150°C (302°F). A heat gun is the recommended tool — move it slowly and evenly along the tubing from the center outward to avoid trapping air bubbles. An open flame such as a lighter can be used with caution but may scorch the tubing or cause uneven shrinkage.

The five diameter options (Φ4, Φ6, Φ8, Φ12, Φ16mm) cover a wide range of wire gauges from approximately AWG 20 up to AWG 4/0 and common connector bodies including Anderson Powerpole, Deutsch DT, and ring terminals. Always verify the supplied inner diameter against your specific connector or wire bundle before ordering. If you are unsure, contact us with your connector model number and we can advise.

Each variant is sold in packs of 1, 5, or 10 pieces, all cut to 200mm (≈7.9") length. Each size must be ordered separately — select your diameter and quantity from the variant options above. If you need multiple diameters, simply add each size to your cart as a separate line item.