Silicone Rubber Heat Shrink Tubing — Φ0.8mm to Φ30mm, Flexible & Color-Coded

Measure the outer diameter of the wire or component you need to cover, then select a tubing size whose unshrunk inner diameter is typically 20–50% larger than that measurement. For example, if your wire is 3mm in diameter, a Φ4mm or Φ5mm tube generally provides a secure fit after shrinking. The "Diameter (Unshrunk)" listed in the variants is the pre-shrink size — after applying heat, it will shrink down to grip the wire.

Silicone heat shrink tubing typically has a 2:1 shrink ratio, meaning the tubing shrinks to approximately half its original inner diameter when heat is applied. So a Φ10mm tube would shrink to roughly Φ5mm. Exact ratios can vary slightly by size — please contact us to confirm for your specific diameter if precision fit is critical.

This silicone rubber heat shrink tubing generally begins to shrink at around 120°C (248°F). A heat gun set to low or medium is recommended for even, controlled shrinking — avoid open flame where possible. Once installed, the tubing is typically rated for continuous operation from -60°C to +200°C (-76°F to +392°F), making it suitable for engine compartments, industrial equipment, and outdoor installations.

Yes. Silicone rubber is inherently resistant to moisture, UV exposure, and weathering. It does not crack or harden in cold temperatures the way standard PVC tubing can, making it well-suited for outdoor wiring, marine electrical systems, garden lighting, and any application where the tubing may be exposed to humidity or occasional water contact.

Silicone heat shrink tubing is commonly used in automotive wiring harnesses, sensor leads, and under-hood applications due to its heat and vibration resistance. For high-voltage or safety-critical electrical installations, please verify the specific voltage rating with us before ordering, as ratings can vary by wall thickness and diameter.

The color is primarily for visual identification and cable management — for example, using color-coded heat shrink tubing to distinguish positive/negative leads, different circuit phases, or signal types in a control panel. All six colors in this listing share the same silicone rubber material and generally equivalent performance characteristics. Choose the color that matches your wiring convention or project requirements.

Silicone heat shrink tubing typically experiences minimal longitudinal (lengthwise) shrinkage — generally less than 5–10% — so the 1m or 5m length you order will remain close to that measurement after shrinking. As a precaution, cut your pieces slightly longer than the area you need to cover before applying heat.

While silicone rubber is more heat-tolerant than PVC, using an open flame is generally not recommended as it can cause uneven shrinking, scorching, or damage to the tubing surface. A heat gun on a low-to-medium setting gives you better control and a cleaner result. If a heat gun is not available, a hair dryer on its highest setting may work for smaller diameters, though results will typically be slower.