LOGIC Heat Shrink Tubing 4.0mm 1m Red 1m Black O-LG-HS04

• Brand: LOGIC RC
• Model number: O-LG-HS04
• Product type: Heat shrink tubing
• Nominal expanded diameter: 4.0mm
• Un-shrunk (expanded) diameter: 4.8mm
• Shrunk (recovered) diameter: 1.6mm
• Lay flat width: 7.5mm
• Sized to fit over wire diameter: Up to 4mm
• Quantity: 2 metres total (1m red, 1m black)
• Colours: Red and black
• Shrink ratio: Approximately 3:1
• Shrink activation temperature: 125°C
• Operating temperature range: -45°C to +125°C
• Material properties: Flexible
• Flame retardant: Yes
• Low smoke if burned: Yes
• Applications: Cable and terminal insulation, cable marking, mechanical protection, colour coding
• Barcode: 5055320200215

Overview

The LOGIC Heat Shrink (1m Red/1m Black) 4.0mm is an essential component for any RC enthusiast working with electronics and wiring in the UK RC hobby scene. Whether you're building a brushless RC car, upgrading an electric aircraft, or undertaking general RC model maintenance, quality heat shrink tubing is indispensable for protecting connections and creating a professional finish. This versatile pack supplies two one-metre lengths—one red and one black—giving you the flexibility to colour-code your electrical work for easy identification and troubleshooting.

Heat shrink tubing serves multiple critical purposes in RC model building and maintenance. It provides durable insulation for soldered joints and terminal connections, protects wiring from abrasion and mechanical damage, and allows for neat cable marking and organisation. The 4.0mm size sits in the sweet spot for most RC applications, fitting comfortably over standard wire gauges commonly used in RC electronics. Whether you're a seasoned RC competitor fine-tuning a race machine, a weekend basher maintaining your favourite off-road buggy, or a hobbyist building your first RC model, quality heat shrink tubing like this LOGIC option ensures your electrical work looks professional and performs reliably.

LOGIC heat shrink tubing is manufactured to rigorous standards with features that make it the preferred choice for RC model builders across the UK. The tubing is flexible, flame retardant, and produces minimal smoke if exposed to heat, making it safer to use during the shrinking process. With an operating temperature range from -45°C to 125°C, this heat shrink maintains its integrity across the full spectrum of UK weather conditions and indoor use environments. The shrink activation temperature of 125°C is easily achievable with a standard heat gun, soldering iron, or even a cigarette lighter for small applications.

Key Features

• Dual-colour pack — Supplied as one metre of red and one metre of black tubing, allowing you to colour-code your electrical connections for easy circuit identification and professional aesthetics. This is particularly valuable when building complex multi-cell battery harnesses or labelling different voltage circuits in your RC model.
• Flexible construction — The tubing remains flexible even after shrinking, which means it won't crack or become brittle during installation or operation. This flexibility is crucial in RC applications where vibration, movement, and thermal cycling are constant factors in the operating environment.
• Flame retardant formulation — The material resists burning and produces minimal smoke if accidentally exposed to flame or excessive heat, providing a significant safety advantage over standard plastic tubing. This feature is particularly important when working with high-amperage ESC connections or soldering near finished models.
• Low smoke if burned — Should the tubing be exposed to high temperatures, it produces minimal smoke compared to conventional alternatives, making it safer to use indoors and in enclosed workshop spaces, a common consideration for UK hobbyists with limited dedicated RC workshop areas.
• Wide operating temperature range — Rated for continuous use from -45°C to +125°C, this tubing maintains its protective properties whether you're operating your RC model in winter frost or high summer heat, and it won't degrade during extended storage in unheated garages or sheds.
• Professional shrink ratio — Features approximately a 3:1 shrink ratio, meaning a 4.0mm expanded tube recovers to approximately 1.6mm when heated. This dramatic reduction creates a tight, waterproof seal around connections and solder joints, essential for protecting sensitive electronics from moisture and contamination.
• Precise sizing for 4mm wire — Designed specifically to fit over 4mm diameter wire with the expanded diameter of 4.8mm, providing a comfortable fit that allows for even heat distribution during shrinking. The tubing can accommodate wire up to 4mm diameter without bunching or requiring excessive heat.

Technical Performance

The LOGIC Heat Shrink 4.0mm operates at a shrink temperature of 125°C, which is an ideal activation point achievable with basic workshop tools. The un-shrunk expanded diameter measures 4.8mm, providing clearance around standard 4mm diameter wiring commonly found in RC car ESCs, lipo battery connectors, and motor lead extensions. Once activated by heat, the tubing recovers to a finished diameter of 1.6mm, creating a snug, protective sheath that seals the connection against moisture, dirt, and oxidation. The lay-flat width of 7.5mm indicates the width of the tubing when squashed flat, which helps you determine the correct size for bundled cables or larger diameter applications. The tubing's construction prioritises durability and electrical protection; the flame-retardant polymer blend ensures that accidental contact with a soldering iron or heat gun won't cause catastrophic failure. The approximate 3:1 shrink ratio is ideal for RC applications where you need maximum material contraction without requiring extreme heat that might damage nearby components. The flexible nature of the material, even after shrinking, means the finished work can move with vibration and thermal expansion cycles without cracking—a critical consideration in RC models where chassis vibration and engine heat cycles are routine.

What's in the Box

• 1 metre of red 4.0mm heat shrink tubing
• 1 metre of black 4.0mm heat shrink tubing

Frequently Asked Questions

• What size heat shrink do I need for my RC model? — Heat shrink sizing is based on the wire diameter you're protecting. The LOGIC heat shrink sizing guide explains that the inside diameter is approximately 20% larger than the nominal size, so 4.0mm heat shrink tubing can comfortably fit over wire up to 4mm in diameter. When choosing heat shrink, measure your wire or connector diameter and select tubing that matches—this 4.0mm size is ideal for standard ESC leads, battery connector applications, and typical motor lead extensions used in most RC cars, boats, and aircraft.
• How do I activate the heat shrink tubing? — The LOGIC heat shrink activates at 125°C, which can be achieved using several common workshop tools: a heat gun set to medium-high temperature, a soldering iron held near (not touching) the tubing, a lighter passed quickly over the surface, or even a hot-air station. For best results with a heat gun, hold it 10-15cm from the tubing and move it constantly to ensure even heating and avoid overheating any particular section. Never apply intense direct flame directly to the tubing as this can cause uneven shrinking or scorch marks.
• Is heat shrink tubing suitable for high-current battery connections? — Yes, heat shrink tubing is an excellent choice for insulating battery connections, soldered joints on ESCs, and other high-current applications. However, heat shrink should be considered an insulation aid, not a primary conductor splice. For the most secure connections, always solder or crimp your connections first, then apply heat shrink tubing for additional protection and waterproofing. The flame-retardant properties of LOGIC heat shrink make it particularly suitable for close proximity to high-current connections.
• What is the shrink ratio and why does it matter? — LOGIC heat shrink features approximately a 3:1 shrink ratio, meaning it reduces to one-third of its original expanded size when heated. This substantial contraction creates a tight, protective seal around your connections. The 4.0mm tubing, for example, shrinks from 4.8mm expanded diameter down to 1.6mm recovered diameter, creating significant grip and protection around 4mm diameter wire or connectors.
• Can I use this heat shrink on wet connections or after water exposure? — Heat shrink tubing should only be applied to dry connections for optimal results. The adhesive properties and seal quality depend on direct contact between the tubing and the underlying connection. If your connection has been exposed to water, dry it thoroughly with compressed air or allow it to air-dry completely before applying the heat shrink tubing. The flame-retardant and low-smoke properties make this tubing suitable for protecting connections from future moisture exposure once properly dried and sealed.
• Is the dual-colour pack better than buying single colours? — The red and black colour combination provides excellent versatility. Red is traditionally used to indicate positive connections or higher voltage circuits, whilst black indicates negative or ground connections. This colour-coding system is particularly valuable when building complex battery harnesses for multi-cell LiPo packs or when colour-coding different voltage circuits in aircraft or larger RC models. Having both colours in one pack ensures you're never short of either colour for your projects.
• How should I store heat shrink tubing? — Store your heat shrink tubing in a cool, dry place away from direct sunlight and heat sources. The LOGIC tubing's operating range of -45°C to +125°C means it's stable in typical UK workshop conditions. Ensure the tubing is kept away from sharp objects that might puncture or cut it during storage, and consider storing different sizes together in a small drawer or container for easy organisation and access when working on RC projects.

Why Buy from RC Model Shop?

RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the LOGIC Heat Shrink (1m Red/1m Black) 4.0mm O-LG-HS04 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.

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