In modern power electronics and electrical connection systems, the selection of insulation protection materials directly affects equipment safety and service life. With the increasing demand for high‑voltage and high‑current applications, the market has seen a growing need for heat‑shrinkable tubing with larger diameters and better visibility. Large Diameter Transparent Heat Shrink Tubing, as a solution that combines insulation performance with visual inspection convenience, is gradually becoming the preferred choice for protecting busbars, high‑voltage cable joints, and large‑size wire harnesses.

1. What is Large Diameter Transparent Heat Shrink Tubing?

Heat shrink tubing is a polymeric material that radially shrinks upon heating to tightly cover the surface of objects. When the diameter reaches 40 mm or above, it is classified as a large‑size product, while the transparent material allows direct observation of internal solder joints, connection status, or corrosion without removing the tubing for inspection. Large Diameter Transparent Heat Shrink Tubing is typically made of cross‑linked polyolefin, offering excellent electrical strength, good flexibility, and flame retardancy. For power systems with voltage levels up to 35 kV, this type of product provides a reliable insulation barrier, effectively preventing tracking and short‑circuit accidents.

2. Size Range and Customisation Capabilities

To meet the protection needs of wire harnesses and busbars of various sizes, Large Diameter Transparent Heat Shrink Tubing is available in a range of pre‑shrink inner diameters from 40 mm to 200 mm, with common sizes including 40 mm, 55 mm, 75 mm, 110 mm, 130 mm, 180 mm, and the newly introduced 200 mm extra‑large size. Users can choose the appropriate shrink ratio (typically 2:1 or 3:1) based on the actual outer diameter of the object to be covered. In addition, the product supports colour customisation (up to four colours besides the natural transparent, such as red, yellow, blue, etc.) and printing of customer‑specific logos or model numbers on the tubing surface for easy on‑site identification and traceability. The minimum order quantity is flexible, and large‑volume orders (e.g., 30,000 metres per colour) ensure stable supply, making it suitable for mass production support.

3. Typical Application Scenarios

Owing to its high voltage rating up to 35 kV and excellent transparency, Large Diameter Transparent Heat Shrink Tubing is widely used in the following areas:

• Insulation protection of busbars in high‑voltage inverters and switchgear cabinets to prevent phase‑to‑phase short circuits;

• Outer sheath of large cable intermediate joints, providing both mechanical protection and visual monitoring;

• Termination encapsulation of high‑voltage wiring harnesses in new energy vehicles, allowing visual inspection of solder quality;

• Electrical connection parts in rail transit and wind power equipment, adapting to wide temperature variations and vibration environments.

In summary, Large Diameter Transparent Heat Shrink Tubing, with its broad size range, high transparency, international certifications RoHS and flexible customisation options, offers an efficient and reliable insulation solution for the power electronics and high‑end wiring harness industries. As equipment miniaturisation and high‑voltage trends progress simultaneously, the market demand for large‑diameter transparent heat shrink tubing will continue to grow. Selecting products that comply with RoHS, CE, and UL standards, combined with proper installation techniques, will significantly enhance long‑term operational safety and maintenance convenience. For samples or technical data sheets, please contact professional suppliers for consultation.