Select a pre-shrink inner diameter that is larger than your wire or component's outer diameter, but small enough that the post-shrink diameter (pre-shrink ÷ 1.7) will grip it firmly. For example, a φ6mm tube shrinks to approximately φ3.5mm (≈0.14"). When in doubt, size up one step — silicone tubing is flexible and forgiving. If you're unsure, contact us with your wire gauge or OD measurement.

A 1.7:1 ratio means the tubing shrinks to approximately 59% of its original inner diameter when heat is applied. So a φ10mm tube becomes approximately φ5.9mm (≈0.23") after full recovery. This is generally sufficient for most wire bundling, connector sealing, and strain relief tasks.

This silicone tubing typically begins to shrink at around 120°C and fully recovers by 150–180°C. A heat gun set to 150–200°C is recommended for consistent results. Avoid open flames, which can cause uneven shrinkage or surface damage. The tubing is rated for continuous operation up to 200°C (392°F).

Yes. Silicone rubber is inherently resistant to UV radiation, ozone, moisture, and a wide range of chemicals. This tubing is generally suitable for outdoor wiring, marine electrical systems, and industrial applications where exposure to weather, salt spray, or humidity is a concern.

Silicone rubber is inherently flame-retardant and self-extinguishing in most cases. It does not produce toxic fumes when exposed to flame, making it a safer choice compared to standard PVC heat shrink in enclosed panels, EV battery assemblies, or sensitive electronic environments.

For single-project repairs or prototyping, 1–3 meters is typically sufficient. For production runs, panel wiring, or if you regularly work with a specific diameter, 5–10 meter rolls offer better value per meter. The tubing cuts cleanly with standard scissors or a utility knife — no special tools required.

Yes. Silicone's flexibility and elasticity make it well-suited for automotive wiring harnesses, high-vibration machinery, and robotics where rigid PVC tubing would crack or fatigue over time. It remains pliable even at low temperatures, which is an advantage in cold-climate automotive applications.