This Narva 3.2mm Black Heatshrink Tubing Dispenser (20M) gives you a full 20 m of one size heatshrink ready on the bench, with a pre‑shrink bore of 3.2 mm and a recovered size near 1.6 mm. You can cover joins on standard accessory wiring and keep looms neat across long runs. The operating range from -75 °C to +125 °C suits engine bays, headlight circuits and under‑dash work across most touring setups.

The tubing uses flame‑retardant, self‑extinguishing polyolefin with cross‑linking rated for -75 °C to +125 °C, so it holds shape when cables warm up. The 20 m dispenser carton keeps the black heatshrink clean and tangle‑free in the shed or canopy. The consistent 3.2 mm pre‑shrink internal diameter works well on common auto cables once reduced to roughly 1.6 mm, making it a smart buy for repeat electrical jobs on touring rigs.

• Narva 3.2mm black heatshrink tubing in dispenser roll
• Supplied as a continuous 20 m length
• Pre-shrink internal diameter of 3.2 mm
• Recovers to around 1.6 mm internal diameter
• Manufactured from flame-retardant self-extinguishing polyolefin
• Operating temperature range from -75 °C to +125 °C
• Suited to general automotive wiring and cable protection
• Black colour helps keep looms neat and uniform
• Dispenser style packaging keeps tubing accessible and tidy
• Ideal size for repeated use on common accessory wiring

Q: What cable sizes work best with this 3.2mm heatshrink?

This 3.2mm heatshrink suits small automotive wiring where the insulation outside diameter is below 3.2mm before shrinking. That usually covers lighter accessory and signal wiring in a vehicle loom. Once heated, the tubing recovers to roughly 1.6mm internal diameter. That tighter size helps grip the insulation and support solder or crimp joins.

Q: What temperature range can this Narva heatshrink handle in use?

The Narva tubing is rated for an operating temperature range from -75 °C to +125 °C. That range covers most under‑bonnet and interior wiring conditions in Australian vehicles. The material keeps its shape and grip within that band. Always avoid direct exhaust contact or other extreme heat sources that exceed the rating.

Q: Is the tubing material flame-retardant for automotive applications?

Yes, the Narva heatshrink uses flame-retardant, self-extinguishing polyolefin. That means if a brief ignition source is removed the material is formulated to stop burning. This characteristic is well suited to automotive wiring looms where extra protection around joins is important. It still needs correct fuse protection and wiring practice.

Q: How is the 20 m length supplied for storage and use?

The Narva 3.2mm black heatshrink is supplied on a 20 m dispenser roll. The roll sits inside a carton that feeds the tubing out as required. This setup keeps the tubing clean and organised between jobs. It also makes it straightforward to cut off only the length you need for each repair or install.

• Suitable for use on automotive wiring looms and accessory circuits
• Fits cables that suit 3.2 mm pre-shrink internal diameter before heating
• Requires a compatible heat source such as an appropriate heat gun for shrinking
• Commonly used for insulating and protecting joined or terminated automotive wires