GI Earthing Strips: Why Galvanizing Quality Matters More Than Price 

Imagine an electrical contractor comparing two quotations for an industrial project. Both suppliers offer GI earthing strips of similar dimensions, but one quotes a slightly lower price per kilogram. On paper, choosing the cheaper option seems like an easy way to control procurement costs.  

However, the real difference may only become apparent months or years after installation, when corrosion, maintenance requirements or premature replacement start affecting the project.  

When buying a GI earthing strip, the lowest purchase price does not necessarily translate into the lowest long-term cost. Steel quality, galvanizing methods, zinc coating thickness, and verifiable quality documentation all influence how well the material performs in its intended environment.  

For electrical contractors, EPC companies, project engineers and procurement managers, this guide explains how to evaluate galvanizing quality, understand coating specifications and select earthing materials with greater confidence.  

1. Not All GI Earthing Strips Are Manufactured the Same  

At first glance, two galvanized strips may look almost identical. Both may have a metallic finish, similar dimensions and comparable weights. Yet their protective performance can differ considerably.  

The difference lies in the material and manufacturing process. Steel quality affects the strip’s mechanical properties, while the galvanizing process determines how effectively its surface is protected against corrosion. 

A strip with an inadequate or inconsistent zinc layer may begin deteriorating sooner in a demanding environment. By contrast, a properly galvanized product provides a protective barrier that helps extend the steel’s service life.  

This distinction matters for installations in factories, commercial buildings, substations, warehouses and outdoor infrastructure, where accessing buried or concealed earthing components for repairs can be difficult.  

Before comparing quotations, buyers should evaluate:  

• Steel quality: Confirm that the material meets the project’s dimensional and technical requirements.
• Galvanizing method: Establish whether the product is hot-dip galvanized and manufactured to the specified requirements.
• Coating thickness: Check the specified zinc coating and how it will be measured.
• Quality documentation: Request relevant inspection reports and galvanizing test certificates.
• Standards compliance: Verify the applicable specification and its acceptance criteria.

The objective is to compare products on a like-for-like technical basis rather than selecting a supplier based only on the rate per kilogram.  

2. Why Zinc Coating Thickness Matters  

Galvanization protects steel by applying a zinc-based coating that slows corrosion. In hot-dip galvanization process, Mild steel is immersed in molten zinc, forming a coating of zinc and zinc-iron alloy layers.  

The resulting protection depends on several factors, including coating thickness, steel characteristics, and the environment in which the product is installed. The American Galvanizers Association explains how atmospheric conditions influence the Galvanizing corrosion behaviour and service life of galvanized steel.  

Source: American Galvanizers Association. Actual corrosion rates depend on exposure conditions. 

A thicker coating can provide a larger protective reserve, but thickness alone is not a guarantee of performance. The coating must also satisfy the relevant specification and be suitable for the installation conditions.  

What does 86+ microns mean?  

For its GI earthing strip offering, Parco Engineers specifies a hot-dip galvanized coating of minimum average of 86 microns (610 g/m²).  

A micron, also known as a micrometre, is one-millionth of a metre. Coating thickness expressed in microns measures the depth of the protective layer, while coating mass in grams per square metre expresses the mass of the coating over a given surface area.  

These measurements describe related but different properties. They should not be treated as automatically interchangeable without considering the applicable measurement method, coating composition, and specification.  

For buyers, the practical takeaway is simple: ask for the actual coating requirement, the test method and evidence that the supplied batch meets the agreed specification.  

A lower-priced strip with an insufficient coating may create additional costs through corrosion-related maintenance or replacement. The right comparison is therefore between products that meet the same technical requirements, not simply between their quoted prices.  

3. The Hidden Cost of Choosing Low-Quality Earthing Strips  

A lower quotation may look attractive during procurement, but the initial price represents only one part of the total cost of ownership.  

If corrosion protection is inadequate for the installation environment, a project may face additional inspection, maintenance, and replacement expenses. Where earthing components are buried, covered by concrete or installed beneath finished surfaces, accessing them can be particularly disruptive.  

Potential consequences include:  

• Faster corrosion: An inadequate protective layer may be consumed sooner in corrosive conditions.
• Higher maintenance costs: Inspections, repairs and replacement can add labour and material expenses.
• Project disruption: Repairing inaccessible earthing components may require excavation or other remedial work.
• Electrical reliability concerns: Deterioration of earthing conductors or connections can compromise the intended performance of the earthing system.

A properly selected galvanized earthing strip helps manage these risks, but galvanizing quality is only one part of a safe installation. Correct sizing, electrical continuity, connection quality, installation practices and periodic inspection also matter.  

For industrial and infrastructure projects, choosing suitable earthing material at the procurement stage can help avoid preventable lifecycle costs.  

4. Which Galvanizing Standards Should Buyers Check?  

Standards help define coating requirements, inspection procedures and acceptable product characteristics. However, buyers should verify that the selected standard applies to the particular product and that the required edition is current.  

Relevant references include:  

• IS 4759: Covers hot-dip zinc coatings on structural steel and other allied products. The Bureau of Indian Standards lists the 1996 edition as withdrawn in January 2026 and identifies IS 2629 (Part 1):2025 as its successor. Buyers should confirm the currently applicable specification for their product and project.
• IS 2629 (Part 1):2025: Addresses the process, design, testing and application of hot-dip galvanizing for iron and steel using batch processing.
• ASTM A123/A123M-24: Specifies requirements for hot-dip galvanized coatings on a range of iron and steel products, including GI plates, bars and strips.
• ISO 1461:2022: Specifies general requirements and test methods for hot-dip galvanized coatings on fabricated iron and steel articles within its scope.

These references are not automatically interchangeable, and a coating target should not be assumed to satisfy every standard. The project’s technical specification should identify the applicable standard, required coating level and verification method.  

When assessing Parco Galvanizing standards for steel, buyers should request confirmation of the specifications applicable to the supplied product rather than relying on a general statement that the material meets industry standards.  

5. Why Galvanizing Test Certificates Matter 

A product description tells you what a supplier claims to provide. A galvanizing test certificate helps you verify whether the supplied material meets the agreed requirements.  

For EPC companies, electrical contractors and procurement teams, documentation is especially important when materials must pass technical approvals, quality inspections or project audits. 

Before ordering a GI earthing strip, ask the supplier these questions: 

• What is the specified and measured zinc coating thickness?
• Is the strip hot-dip galvanized, and what process has been used?
• Can you provide a batch-specific galvanizing test certificate?
• Is raw material traceability available?
• Which galvanizing standard and edition apply?
• What testing method and acceptance criteria are used?

The certificate should identify the relevant batch or lot wherever applicable, state the measured results and make it possible to connect those results with the delivered material.  

At Parco Engineers, galvanizing test certificates, raw material traceability and compliance documentation can support buyer verification, subject to the agreed product and batch requirements. This gives project teams a clearer basis for evaluating quality before the material reaches the installation site.  

6. How to Compare GI Earthing Strips Beyond Price  

Parco Engineers manufactures hot-dip galvanized GI earthing strips in accordance with applicable international standards and project specifications. For clients requiring higher zinc coating thickness, Parco can assess customised requirements based on project specifications and manufacturing feasibility. 
  
(Focus on Parco Manufactures Hot Dip Galvanized Earthing Strips as per international standards and also manufacturers as per client requirements if they require more coating thickness) 

Consider a project requiring several tonnes of earthing strips. A small difference in the rate per kilogram may appear significant when multiplied across the order. But if one quotation excludes essential quality documentation or does not demonstrate the required coating thickness, the prices are not genuinely comparable. 

A better procurement process starts by fixing the technical requirements and then comparing quotations that meet them.  

A practical buyer’s checklist  

Before approving a purchase, confirm the following:  

• Required strip dimensions and steel specifications
• Agreed hot-dip galvanizing requirements
• Minimum coating thickness and measurement method
• Applicable standard and current edition
• Batch-specific test documentation
• Delivery inspection and traceability requirements
• Suitability for the installation environment

This approach is equally useful when comparing GI flats, GI earthing flats and other galvanized steel components intended for electrical or infrastructure applications.  

7. Choose Long-Term Value, Not Just a Lower Rate 

The right GI earthing strip is one that meets the project’s electrical, mechanical and corrosion-protection requirements, with evidence to support its quality.  

For strip earthing in industrial plants, commercial developments and outdoor installations, a reliable selection process considers steel quality, galvanizing, coating thickness, testing and the environment in which the material will be used.  

Hot-dip galvanized Structure can provide effective galvanizing corrosion protection, but their actual service life depends on exposure conditions, coating characteristics, installation and maintenance. A marine or chemically aggressive environment, for example, may require a different protection strategy from a relatively mild indoor application.  

That is why the purchase decision should combine technical evaluation with a realistic assessment of maintenance and replacement costs. A lower initial quotation is worthwhile only when the product also satisfies the required performance criteria.  
Parco Engineers helps buyers evaluate galvanized steel products through a quality-focused approach that emphasises coating specifications, traceability and supporting test documentation.  

The key principle is simple: a price per kilogram tells you what you pay today, while verified quality helps you understand what you are buying for the years ahead.  

When buying GI Earthing Strips, don’t just ask for the price per kilogram. Ask for the coating thickness, galvanizing test certificate, and compliance with standards. Because the true cost of an earthing strip is measured over years of performance, not at the time of purchase.