Hot dipped galvanized trunking, also known as hot dip galvanised trunking, is a type of cable trunking that has taken a galvanization process to enhance its durability and corrosion resistance.JLH Electric has owned hot dipped galvanized workshop .Galvanization is a common method used to protect metal surfaces from rust and corrosion.The process of hot-dip galvanization involves immersing the cable trunking in a bath of molten zinc. The zinc coating adheres to the surface of the trunking, providing a protective barrier against environmental elements such as moisture, humidity, and chemicals that can cause corrosion.

Shandong Jinheng Electric Co Ltd has owned hot dipped galvanized workshop itself. And we can well control the hot dipped galvanized quality, delivery time and production process. In this article, let’s explore the definition, benefits and application of hot dipped galvanized trunking. We think it will help you to understand the this type of cable tray.

1.What Is Hot Dipped Galvanization? 

Galvanization, in general, refers to the process of applying a zinc coating to metal surfaces to prevent corrosion. However, it is important to note that cable trunking, which is commonly made of non-ferrous materials like plastic, aluminum, or stainless steel, does not require galvanization.

Hot dipped galvanization is a process specifically used for coating fabricated steel with a protective layer of zinc. Unlike galvanized steel, which is produced through electrolysis, hot-dipped galvanized steel is created by immersing the steel in molten zinc. The process involves three essential steps: surface preparation, galvanizing, and inspection.

Hot dip galvanization is a specific form of galvanization primarily used for iron and steel. It entails immersing the metal object into a bath of molten zinc at a high temperature, typically around 450 °C (842 °F). Before immersion, the metal is carefully cleaned and prepared to ensure proper adhesion of the zinc coating. As the metal is dipped into the zinc bath, a metallurgical bond is formed between the zinc and the steel or iron substrate.

The result of hot-dipped galvanization is a durable and protective zinc coating on the steel or iron surface. This coating acts as a barrier, shielding the underlying metal from corrosive elements and extending its longevity.

Hot dipped galvanized surfaces are widely used due to their enhanced durability and resistance to corrosion. They find application in various industries and environments where protection against rust and corrosion is crucial.

It is important to periodically inspect and maintain hot-dipped galvanized surfaces to ensure their long-term effectiveness. This may involve cleaning, repainting, or repairing any damaged areas to preserve the protective properties of the zinc coating.

Hot Dipped Galvanized Trunking
Hot Dipped Galvanized Trunking And Its Applications

2.What Is Hot Dipped Galvanized Trunking?

Hot-dipped galvanized trunking is a cable management system made from steel that has been coated with a protective layer of zinc. The process of hot-dip galvanization involves immersing the steel into molten zinc, resulting in a durable and corrosion-resistant coating. Hot dip galvanised trunking is eco-friendly and non-conductive of electricity and possesses excellent flame-retardant properties, ensuring safety in electrical installations.

JLH hot dipped galvanized trunking trunking is manufactured using low carbon steel strip that has been continuously hot-dipped in zinc, conforming to the BS EN 10346:2009 standard. It is designed to meet the demands of various installation types and environments. Each length of the metal trunking is supplied with a lid and couplers, facilitating easy installation and providing a secure enclosure for cables. It is typically sold in multiples of three meters.

JLH Hot dip galvanized trunking is available in different sizes and configurations, allowing for flexibility and customization to suit specific project requirements. It can be installed both indoors and outdoors, making it versatile for a wide range of applications.

This trunking system offers an organized solution for routing and concealing cables, promoting a tidy and clutter-free environment. It finds utility in residential, commercial, and industrial settings, ensuring efficient cable management and protection.

3. What Are Benefits of Hot Dipped Galvanized Trunking

Hot dipped galvanized trunking offers corrosion resistance, durability, longevity, versatility, ease of installation, and sustainability. These advantages make it a reliable and preferred choice for cable management solutions in various environments

3.1 Corrosion resistance

The zinc coating applied for Hot dipped galvanized trunking during the hot-dip galvanization process provides excellent corrosion resistance. This protective layer shields the steel from corrosive elements, even in harsh environments. It prevents rust formation and extends the lifespan of the trunking, ensuring long-term durability.

3.2 Durability

Hot dip galvanized trunking is designed to withstand years of use without compromising its structural integrity. The galvanized coating provides abrasion resistance, uniform protection, and complete coverage. The intermetallic layers formed during galvanization are metallurgically bonded to the base steel, making them harder and more resistant to impact. Additionally, the top layer of pure zinc is ductile and able to absorb impacts, contributing to the trunking’s exceptional abrasion resistance.

3.3 Longevity

Hot dip galvanized trunking is commonly used in demanding environments and provides maintenance-free corrosion protection for decades. The corrosion rate of hot-dip galvanized steel is typically 1/30th that of bare steel in the same environment. Real-world studies have shown that hot-dip galvanizing can offer more than 70 years of corrosion protection in highly corrosive atmospheric exposures, such as industrial settings.

3.4 Versatility

Hot dipped galvanized trunking is available in various sizes and configurations, allowing for customization to meet specific project requirements. This versatility makes it suitable for a wide range of applications.

The ease of installation is an added benefit. Hot-dip galvanized trunking is relatively easy to install and can be used both indoors and outdoors, providing flexibility in cable management solutions.

3.5 Sustainability

Sustainable development is a growing concern, and Hot dipped galvanized trunking aligns with this commitment. Its maintenance-free longevity reduces the need for frequent replacements, leading to positive environmental and economic benefits for future generations.

HDG Cable Trunking
Cable trunking

4.Does Hot Dipped Galvanized Trunking Rust? 

Hot dipped galvanized trunking is highly resistant to rust and corrosion. The zinc coating acts as a protective barrier, making it suitable for installations in moisture-prone environments. With proper maintenance, hot-dipped galvanized trunking can provide long-lasting protection for electrical cables while maintaining its structural integrity.

The hot dipped galvanization process involves applying a protective zinc coating to the trunking’s surface, which acts as a barrier against corrosive elements. This zinc coating provides excellent durability and ensures that the trunking remains resistant to rust even in challenging environments.

The zinc coating on hot-dipped galvanized trunking serves as a sacrificial layer. If the trunking does get scratched or damaged, the zinc coating will corrode first, protecting the underlying metal from rust formation. This sacrificial behavior helps to maintain the integrity of the trunking and extends its lifespan.

Hot-dipped galvanized trunking is particularly suitable for installations where moisture is a concern. The galvanized coating effectively shields the trunking from the effects of water, preventing rust and corrosion from developing. This makes it a reliable choice for outdoor applications, areas with high humidity levels, or environments exposed to corrosive substances.

The zinc coating on hot-dipped galvanized trunking may naturally wear down or become damaged over an extended period of time. In such cases, regular maintenance and inspections are recommended to detect any signs of corrosion and address them promptly.

5.  What Is Hot Dipped Galvanized Cable Trunking Used for?

5.1  Outdoor Installations

Hot dipped galvanized trunking with a 65-micron coating is well-suited for outdoor installations where the trunking is exposed to weather elements such as rain, humidity, and UV radiation. It provides excellent protection against corrosion and ensures the longevity of the trunking in challenging outdoor environments.

5.2 Industrial Settings

In industrial environments where there may be exposure to chemicals, moisture, or harsh conditions, hot-dipped galvanized cable trunking with a 65-micron coating offers superior resistance to corrosion. It can be used in manufacturing plants, chemical facilities, wastewater treatment plants, and similar industrial applications.

5.3 Marine Environments

Cable trunking installed in marine environments is subjected to high levels of moisture, saltwater, and corrosive elements. Hot-dipped galvanized cable trunking with a 65-micron coating provides an extra layer of protection against corrosion in marine applications, such as shipyards, ports, offshore platforms, and coastal infrastructure.

5.4 Infrastructure Projects

Cable trunking with hot dipped galvanized coating can be used in infrastructure projects where long-term durability and corrosion protection are crucial. This includes bridges, tunnels, railways, highways, and other structures where the trunking is exposed to environmental elements and potential corrosive agents.

5.5 Harsh Environments

Hot-dipped galvanized trunking with a 65-micron coating is suitable for installations in harsh environments such as mining operations, power plants, oil and gas facilities, and chemical processing plants. These environments often involve exposure to corrosive substances, high temperatures, or abrasive conditions.

5.6 Hot dipped galvanized trunking offers enhanced corrosion resistance and durability.

It is commonly used in various applications where robust protection against corrosion is required.


 Hot dipped galvanized cable trunking is not only eco-friendly but also acts as a non-conductor of electricity with excellent flame-retardant properties. It offers a wide range of advantages, including corrosion resistance, durability, longevity, versatility, ease of installation, and sustainability. These qualities make it a reliable and preferred choice for cable management solutions in diverse environments.

However, when selecting cable trunking for specific applications, it is important to consider local regulations, environmental conditions, and the expected service life of the trunking. Consulting industry experts or referring to specific standards can help determine the most suitable cable trunking solution for your particular needs. Additionally, the required coating thickness may vary based on regional and industry standards. To ensure the appropriate coating thickness for your specific application, it is crucial to consult the relevant specifications and guidelines.

JLH Electric mainly manufacture all kinds of cable tray, cable ladder, cable trunking,for example, galvanized, hot dip galvanised, aluminum alloy, stainless steel, PVC, FRP, etc. Size can be customized. Free samples can be provided if request.