Professional-Grade Heat Shrink Tubing | 4:1 Ratio | Double-Wall Waterproof Seal | 4-52mm Diameter

This premium 4:1 heat shrink tubing with a bonded adhesive liner provides a durable, waterproof seal for electrical connections and cable repairs. Available in lengths of 1M, 2M, and 3M, it features a...
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Questions about this product
- How do I choose the correct size of heat shrink tubing for my cables?
- With a 4:1 shrink ratio, this tubing fits over large connectors and shrinks tightly onto the wire. Pick a size where your wire bundle is slightly larger than the recovered diameter but smaller than the expanded diameter. Keep in mind the tubing will shrink up to 10% in length during heating.
- What temperature do I need to reach to get this tubing to shrink?
- You need to heat the tubing to at least 70°C to 80°C to start the shrinking process. For a complete recovery and to melt the internal adhesive liner, ensure your heat source reaches 120°C. Move your heat gun constantly to prevent burning the outer polyolefin wall.
- Can I use this heat shrink tubing for underwater or marine wiring?
- Yes, the inner thermoplastic adhesive melts during heating to form a watertight, moisture-proof seal. The outer polyolefin wall resists common automotive and marine fluids, making it ideal for wet environments. It performs reliably in temperatures ranging from -55°C to +125°C.
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