Silicone Heat Shrink Tubing 1.7:1 — Colored Electrical Wire Sleeving

Measure the outer diameter of your wire or connector before shrinking. With a 1.7:1 shrink ratio, the tubing will shrink to approximately 59% of its listed diameter. For example, a φ4mm (≈5/32") tube shrinks down to roughly 2.4mm (≈3/32"). Choose a size that slides on loosely before heat is applied, then confirm the shrunken size covers the wire snugly. When in doubt, size up by one step.

Silicone heat shrink tubing generally requires a heat source of around 120–200°C (248–392°F). A heat gun is recommended for even, controlled shrinking. Avoid applying an open flame directly to the tubing, as uneven heat can cause bubbling or inconsistent shrinkage.

Silicone is generally resistant to moisture and UV exposure, making it suitable for outdoor and damp-environment wiring in most cases. However, this tubing is not rated as a waterproof seal on its own. For full waterproofing, consider adhesive-lined heat shrink tubing. For outdoor lighting, garden wiring, or marine applications, silicone heat shrink tubing is typically a reliable choice.

Silicone heat shrink tubing is typically self-extinguishing and does not support combustion under normal conditions, making it generally suitable for use in junction boxes, control panels, and automotive wiring. For safety-critical or regulated installations, verify that the specific grade meets your required standards before use.

Silicone heat shrink tubing generally operates in a range of approximately -60°C to +200°C (-76°F to +392°F). This makes it suitable for cold-weather outdoor wiring, high-temperature engine bay applications, and industrial environments where standard PVC tubing would degrade.

The diameter range of φ0.8mm to φ40mm covers a wide variety of wire gauges and connector types — from fine signal wires and thermocouple leads to large power cables and terminal connectors. Select the diameter based on the outer dimension of the component you need to sleeve, not the wire gauge designation alone, as insulation thickness varies by wire type.

Yes. The tubing is sold in 1m, 2m, and 5m lengths and can be cut to any custom length with scissors or a utility knife. Cutting before shrinking is generally easier and produces cleaner edges. Cutting after shrinking is also possible but may require sharper tools for larger diameters.

The "Iron Red (Thickened)" variant has a heavier wall thickness compared to the standard Iron Red option, providing additional mechanical protection and abrasion resistance. It is typically used in applications where the wire or connector is subject to physical stress or rubbing. If you need extra durability in a high-wear area, the thickened variant is generally the better choice.