Frequently asked questions


How do I select a GP pipe?

When selecting a GP pipe, first and foremost, look for pipes with a minimum galvanised coating of 120 gsm (grams per square meter). This ensures enhanced corrosion resistance and prolonged durability.

Secondly, opt for GP pipes made from raw materials from renowned brands like JSW or Tata Steel. These brands are known for their high-quality steel, ensuring strength. Be careful of pipes made from scraps or substandard materials, as they lack the strength and can result in weakened structures that may even collapse, especially when used in roofing applications.

Thirdly, choose pipes that have undergone treatment to prevent the formation of white rust, which can compromise the structural integrity over time.

What is zinc coating and why is it important?

Zinc coating, also known as galvanization, is a process in which a layer of zinc is applied to the surface of a steel pipe, forming a protective coating. This coating serves as a barrier, preventing direct contact between the steel and the surrounding environment. It is this zinc coating that distinguishes GP (Galvanized Pipes) from normal MS (Mild Steel) pipes.

Zinc coating significantly increases the lifespan of the product. It prevents corrosion and the formation of rust. This is particularly crucial in applications where the pipes are exposed to moisture, humidity, or corrosive elements.

It also protects the pipe in case of scratches. The zinc will corrode before the steel, protecting the underlying metal from rust and degradation. This makes the product durable and reliable.

How do we measure zinc coating?

The measurement of zinc coating on a GP (Galvanized Pipes) pipe is technically quantified in terms of gsm (grams per square meter). GSM represents the amount of zinc, in grams, present on a square meter of the pipe’s surface. This measurement provides an indication of the thickness and quality of the zinc coating.

A higher gsm value indicates a thicker zinc coating, which translates to better protection and an extended lifespan for the pipe. The industry standard for zinc coating is typically 120 gsm. However, it’s important to note that cheaper materials may have a lower gsm range of 30-70 gsm. While these pipes may be more affordable, they are prone to rust formation at a faster rate compared to pipes with a higher gsm value.

To measure the gsm of a GP pipe, we encourage you to contact our sales representative. We can provide a demonstration using the appropriate instrument to help you understand and verify the zinc coating thickness. This ensures transparency and allows you to make an informed decision.

What is white rust?

White rust refers to the formation of zinc oxide on the surface of a GI (Galvanised Iron) pipe when it comes in contact with air. When a GI pipe is exposed to air, the zinc in the zinc coating gradually starts to deplete, leading to the development of a layer of zinc oxide. This appears like white rust, a powdery white-colored substance on the surface of the pipe.

To prevent this oxidation, we have developed a specialised solution called Durocoat. Durocoat acts as a protective barrier, preventing the zinc from coming into direct contact with the air and ensuring that the zinc coating remains intact.

What is ISI?

ISI stands for the Bureau of Indian Standards (BIS), which is responsible for assessing and certifying companies and processes to ensure compliance with specifications and standards.

In the case of GI (Galvanized Iron) pipes, the BIS checks various aspects such as strength, thickness, testing procedures, and adherence to technical strength specifications. It conducts inspections at manufacturing units, both through surprise visits and routine inspections. These inspections cover aspects related to raw materials, manufacturing processes, and quality control measures.

While many companies claim to have ISI certification, it is essential to verify the validity of their certification. The BIS has developed an app where individuals can check the authenticity of the ISI certification. By entering the CML (Certification Mark License) number found on the pipe or the company name, one can verify if the ISI number associated with the product is valid or not. It is important not to solely rely on the embossed ISI mark on the pipe, as it could be an outdated or invalid certification.