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What is Hot Dip Galvanised Steel (HDG)?
Hot dip galvanising provides a dependable method of protecting steel from corrosion. During this process, steel components are dipped into molten zinc at around 450°C. As a result, a tough zinc-iron alloy coating forms and acts as a long-lasting shield against rust and weather-related damage.
Source: Galvanizers Association – How HDG Works
Unlike BZP finishes, HDG bonds with the steel at a molecular level. This ensures even complex shapes, including threads and welds, receive full protection.
Where is Hot Dip Galvanised Steel Used in the UK?
HDG steel is commonly used across multiple sectors in the UK due to its strength and corrosion resistance. You’ll find it in:
- Structural frameworks and cable containment systems
- HVAC setups and robust mechanical fixings
- External installations such as railings, gantries, solar panel mounts, and fencing
Because it offers long-term protection, HDG steel meets the NHBC Standards and adheres to UK Building Regulations. Consequently, it is ideal for both commercial and residential construction.
Popular Hot Dip Galvanised Products
To meet the varied needs of contractors and engineers, Direct Channel Support Systems supplies a wide range of HDG products:
HDG vs BZP vs Stainless Steel: A Comparative Overview
Understanding the differences between these finishes is key to selecting the right material. Here’s a side-by-side comparison:
| Hot Dip Galvanised (HDG) | Bright Zinc Plated (BZP) | Stainless Steel (A2/A4) | |
|---|---|---|---|
| Corrosion Resistance |  |
|
|
| Coating Thickness | 50–100 μm | 5–10 μm | Inherent |
| Cost Efficiency | High | Very High | Lower |
| Appearance | Matte Grey | Bright Silver | Polished Finish |
| UK Lifespan | 20–70+ years | 1–5 years | 40–100+ years |
| Common Use | External structures | Dry indoor areas | Food, marine, cleanrooms |
Choosing the Right Finish: Use Case Summary
- Use HDG for outdoor, industrial, or semi-exposed settings where durability and rust resistance are priorities.
- Use BZP in indoor, dry environments where cost matters more than corrosion resistance.
- Use Stainless Steel for high-hygiene or corrosive environments requiring non-reactive, aesthetic finishes.
UK Compliance and Environmental Responsibility
HDG steel must meet BS EN ISO 1461 standards for coating thickness, adhesion, and durability. Moreover, galvanised steel is:
- Fully recyclable (zinc and steel)
- Low maintenance over long life cycles
- Compliant with UK REACh and RoHS regulations
Final Thoughts
Hot dip galvanised steel continues to be one of the most effective and economical solutions for long-term construction use. It offers protection, performance, and peace of mind—especially under UK conditions.
Direct Channel Support Systems supplies a full range of HDG products engineered for reliability, compliance, and ease of use. With next-day delivery and technical support across the UK, we’re here to help you get it done right.
