PTFE Heat Shrink Tubing – Transparent Electrical Sleeving, 0.5mm to 40mm, 1.7:1 & 4:1 Shrink Ratio

Measure the outer diameter of the component you need to cover, then select a tubing size that is typically 20–30% larger than that measurement before shrinking. For example, if your wire bundle is 3mm in diameter, a 4mm or 5mm tube (1.7:1 ratio) will generally provide a snug fit after shrinking. For tighter coverage over irregular shapes, the 4:1 ratio options are a better fit. When in doubt, size up — you can always apply more heat to achieve a tighter shrink.

The 1.7:1 ratio is suitable for most standard wire insulation and cable bundling tasks where the component diameter is relatively uniform. The 4:1 ratio is generally recommended for irregular shapes, connectors, or applications where you need the tubing to conform tightly around a wider range of diameters — for example, transitioning from a cable to a larger connector body.

PTFE heat shrink tubing typically requires higher shrink temperatures than standard polyolefin tubing — generally in the range of 327°C (620°F) or above. A heat gun with adjustable temperature settings is recommended. Standard consumer-grade heat guns may not reach the required temperature; an industrial heat gun or oven is often used for PTFE. Always follow the specific temperature guidelines provided with your order.

Yes. PTFE is inherently resistant to UV exposure, moisture, and a wide range of chemicals, making it well-suited for outdoor, industrial, and chemically demanding environments. It generally maintains its properties across a broad temperature range, typically from -200°C to +260°C (-328°F to +500°F), which covers most outdoor and industrial operating conditions.

PTFE (polytetrafluoroethylene) is generally resistant to most acids, bases, solvents, fuels, and oils. It is one of the most chemically inert materials available, making it a common choice for laboratory, aerospace, and industrial wiring applications. Notable exceptions include molten alkali metals and certain fluorinating agents at elevated temperatures.

Yes. The tubing is sold in continuous lengths (1m, 3m, 5m, 10m, 20m, and 30m) and can be cut to any custom length using scissors or a sharp blade. PTFE cuts cleanly without fraying, so you can prepare precise lengths for each individual wire or component without waste.

Yes. PTFE is an excellent electrical insulator with a very low dielectric constant and high dielectric strength. It is widely used in high-frequency wiring, coaxial cable insulation, and precision electronics where reliable electrical isolation is required. Its low dielectric constant also makes it suitable for RF and microwave frequency applications where signal integrity matters.

Wall thickness after shrinking varies by diameter and shrink ratio. Please contact us to confirm the exact wall thickness for your selected size, as it differs across the product range. This information is important for applications with tight dimensional tolerances.