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Galvanized Iron (GI) / Pre-painted Galvanized Iron (PPGI)

Galvanized Iron (GI)

Galvanized Iron (GI) is sold by CamaSteel which is commonly used in many industrial and commercial uses for their protective steel properties in its steel zinc-coated form. Galvanized Iron is steel or iron that has a layer of protective zinc coating applied to the surface to prevent rusting. The most common method for this is through hot-dip galvanizing where the iron is submerged in molten zinc. Intact zinc coating on GI by CamaSteel prevents corrosive substances from breaching the surface of the underlying steel or iron.

Galvanized iron

Pre-painted Galvanized Iron (PPGI)

Pre-painted Galvanized Iron (PPGI) is another form of galvanized iron where it is similarly hot dipped into zinc. This extension of GI refers to factory pre-painted zinc coated steel, whereas other forms of painted steel are painted after the zinc coating on the steel is formed. The hot dip metallic coating process is typically used to coat steel sheets and coils which may be factory pre-painted like PPGI. PPGI is also used to refer to metallic coated steels that have been pre-painted, but CamaSteel offers PPGI that is zinc coated steel. 

Prepainted galvanized iron

Corrugated Galvanized Iron (CGI)

Corrugated Galvanized Iron (CGI) or roofing sheets are building materials used typically for roofing and go through the same hot-dip galvanizing zinc coating process. Corrugation enables the bending of the steel sheets in the direction perpendicular to the corrugations but not parallel. This product CamaSteel offers is lightweight and simple to transport and has been used as building materials for many generations. This corrugation process is called roll forming and is highly productive and cost effective, and able to be sheared to the desired length.

Corrugated Galvanized Iron

Application of CamaSteel GI 

CamaSteel GI is available in many different forms such as galvanized pipes, frames, steel wire, and car parts. Galvanized steel is present in many commercial and industrial uses including the following:           

  • Household appliances such as washing machines, air conditioning, hair dryers, computers

  • High tension electrical towers, protective gears, highway signs

  • Iron gates and other door and window bars

  • Metal pails and buckets

  • Manufacturing of steel nails

  • Gutters and manholes

  • Commercial buildings for galvanized steel layer: walls and pillars               

This diverse application of GI is typically for steel that needs to maintain its rigidity and strength. CamaSteel provides GI due to its practicality, less expensive price, permanent protection, rapid rate of assembly and other major advantages. 

Application of CamaSteel PPGI

The PPGI that CamaSteel offers provides the same benefits of galvanized steel products with the added benefit of pre-painted steel used for other diverse manufacturing of devices, machines, and tools. PPGI steel coils are typically used for the following applications:            

  • Refrigeration and freezer

  • Washing machines

  • Air conditioners

  • Solar heater

  • Roofing and walling

  • LED TV

  • Microwave Oven

  • DVD Player Set Top Box

  • Furniture

  • Container

  • Electrical Cabinets

Due to the flexibility of the PPGI producing machines, CamaSteel is able to source quality PPGI products that suit the needs of your desired length and paint. Overall, PPGI is a great option for buyers looking for pre-painted galvanized steel products.

Application of CamaSteel CGI

The corrugated galvanized steel roofing sheets that CamaSteel sells are typically used in buildings, military use, sheds, water tanks, and other applications that require corrugated steel roofing. This zinc coated steel has long been reputed for its longevity and structural support capable of heavy weather and pounding. Due to its weather resistance, lightweight, and ease of transportation, CamaSteel recommends CGI for its building properties. Users of CGI seek to purchase roofing material that is waterproof, floor decking, and other uses.

What is Galvanized Iron? 

Galvanized Iron is an iron that has been coated with a protective zinc layer. Iron is mainly galvanized to prevent it from rusting. The process of galvanizing developed in England and France around the same period in 1837. 

Galvanized iron has become a well-known alternative to standard iron and other metals. 

galvanized iron

Is Galvanized Iron Better Than Steel? 

Galvanized Iron is better than steel in various ways. Here are some; 

  • Steel has a carbon steel form that's an alloy of carbon and iron while Galvanized Iron has a zinc coating that protects its surface from rusting. 

  • Steel tends to undergo corrosion once it's been exposed to air and moisture while Galvanized Iron has a protective coating that helps avoid corrosion. 

Is Galvanized Same As Iron?

Galvanized iron is the same as iron, the only difference being the zinc coating. Iron consists mainly of the metal element, while Galvanized iron has an added zinc layer. 

Can Galvanized Iron Rust? 

Galvanized Iron does rust but it takes a lot of time. Galvanized Iron has been coated with a layer of zinc that acts as a barrier to oxygen and water preventing them from reaching the iron. Hereby, providing advanced protection from corrosion. 

How Is Galvanized Iron Made?

Galvanized iron is made through the Galvanizing process. Galvanizing is the process of coating iron with a layer of zinc. The early method of galvanizing was the hot dipping process. 

Today, most galvanized iron is electroplated. The following are the most known methods of galvanizing iron. 

  • Hot-Dipping 

The Hot-Dipping galvanizing process is the immersion of iron into molten zinc after the surface metal base has been cleaned properly. This process provides the iron with a thick zinc coating that finally freezes into spangles in a crystalline surface pattern. 

During this process, various layered structures of iron alloys are formed in-between the inner surface of the iron and the zinc coating. These layers tend to be brittle and hard and might flake or peel if the iron is bent. 

  • ElectroGalvanizing 

ElectroGalvanizing is the process of galvanizing iron through the immersion of iron in a zinc sulfate solution, electrolyte, or cyanide. The electrolytic action deposits a pure zinc coating on the iron. 

How thick the coating is can be decided or controlled by the process. However, the thick coatings achievable through Hot-Dipping are not usually possible during ElectroGalvanizing.  

  • Sherardizing 

Sherardizing is placing a properly cleaned iron in an enclosure free of air where it's been surrounded by metallic zinc dust. The iron is then heated and a thin layer of zinc is produced.

The Sherardizing process is usually limited to small objects. However, the zinc coating would conform to the form of the iron.  

  • Metallic Spraying 

This is the process of finely spraying molten zinc on a cleaned iron. The coating would then be heated and fused with the iron's surface to produce an alloy. The coating achieved in this process does flake or peel on bending. 

The coating achieved through metallic spraying is always less brittle than the coating produced through the other processes. Metallic spray coating is more porous and over time becomes impermeable as the products of corrosion fill up the pores.


How Is Galvanization Used?

Galvanized metals are used mainly because it helps the lifespan of metals. Galvanized metals are used in various industries which include; 

  • Solar Industries 

Solar projects are required to run continuously once installed and any need for maintenance or repair leads to a disruption in service. This is why galvanized metals are highly used in solar projects because of their corrosion protection.

Galvanized metals are also highly known for being environmentally friendly because they don't produce emissions and can go for years without being maintained. 

  • Construction Industry

 Whether for residential or commercial purposes, the durability of galvanized iron and steel has made them so popular in the construction industry. It is also chosen for its aesthetics. The shine that they provide gives it a modern feel and it's highly used in modern architectural designs. 

It can also be used for large constructions such as rails, fencing, tubing, gutters, poles, and many more. 

  • Automobile Industry 

Even though they were used only on luxury automobile models until 1980, the use of galvanized bodies in automobiles is now the norm. About 80% of car bodies are now made up of galvanized steel. The rust resistance ability of galvanized metals is a selling point because it can help automobile industries provide anti-rust guarantees to their customers. 

  • Telecommunications Industry 

Telecommunication lines and poles are not easily maintained, because they are difficult to reach due to their heights. Galvanized metals can be used for phone wiring and other types of equipment which helps reduce the need for maintenance and damage. 

Is Galvanized Iron Better Than Black Iron? 

The answer to which is better between black iron and galvanized iron is based on your project. Here are some of the differences between the qualities of galvanized iron and black iron. 

  1. Corrosion Resistance 

The main difference between galvanized iron and black iron is their corrosion resistance. Black iron is made using a gentle steel compound. Its carbon content is low-grade. On the other hand, galvanized iron is layered with zinc as a protective cover. The process of galvanization helps prevent mineral deposits from building up.

  1. Appearance 

Black iron is usually dark in color compared to galvanized iron. The iron oxide formed while manufacturing is what causes the gray appearance of black iron. Galvanized iron is silvery in color due to the Galvanizing process. 

  1. Durability 

Although steel is quite durable, galvanized iron has higher strength due to the zinc protective layer. The zinc gets damaged rather than the iron and will rust before the iron rusts. This allows the galvanized iron to maintain its integrity and also increase its life span for about 40 to 50 years. 

On the other hand, black iron is not coated and is less durable. 

Considering the above, it'd be safe to say that galvanized iron is better than black iron. 


Which is Better, Cast Iron or Galvanized Iron? 

The key difference between cast iron and galvanized iron is in the means of preparation, properties, and resistances. Due to its corrosion-resistant layer as well as its mechanical properties, galvanized iron is better than cast iron. 

Is Galvanized Iron Good For Outdoor Use 

Galvanized iron is a material renowned for its longevity, need for little maintenance, rust resistance, and economical. Choosing a galvanized metal for outdoor use is a perfect choice. 

What is PPGI Used For? 

PPGI is known as Pre-painted galvanized iron, and can also be known as coil coated steel, pre-coated steel, color coated steel e.t.c. PPGI is factory-made zinc coated steel, where the steel is painted before it forms, as opposed to painting after it forms. 

PPGI are used in various industries some of which include; 

  • Construction Industry 

Pre-painted galvanized iron is used in construction for the manufacturing of roofing tiles, roofing sheets, doors, walls, louvers, etc. PPGI is mainly used in the construction industry:

  • PPGI for Roofing Sheets 

The color-coated steel roofing sheets are the biggest application of PPGI in construction. PPGI roofing sheets are highly durable, and have corrosion resistance, making them the builder's number one roofing choice. 

  • PPGI Windows 

Pre-painted galvanized iron is used for window frames due to the variety of colors available, termite and dust proof attributes, and as being corrosion resistant. 

  • Agriculture

Pre-painted galvanized iron is often used to manufacture stables, chicken coops, haylofts, greenhouses, and barns just to mention little. Again, the durability, heat, and noise insulation characteristics, reduced cost of installation, and aesthetics make PPGI one of the widely used materials in building agricultural facilities and equipment.


What is the Difference between PPGI and PPGL? 

PPGI is the short form of Pre-painted galvanized iron or steel while PPGL is short for Pre-painted galvalume steel. PPGI makes use of galvanized steel as base metal with a zinc coating layer while PPGL uses a galvalume sheet as a substrate, which is coated with aluminum (55%), zinc(43.3%), and silicon(1.6%).

Here are some other differences between PPGI and PPGL; 

  • Durability

PPGI is coated with zinc to protect its longevity. For the galvanized iron sheet, the base metal gets damaged once the zinc coating is corroded. A galvanized sheet is expected to last for about 10 to 15 years. For PPGL, the aluminum and zinc alloy form small particle areas. The zinc will corrode quite fast, while the Aluminum phase corrodes gradually. So, PPGL is more corrosion resistant than PPGI. 

  • Weight Difference

With the same thickness in the coating, PPGL is lighter than PPGI, this is because the weight of aluminum is smaller than that of Zinc. PPGL coating covers about 0.3% more than PPGI. 

What is a PPGL Sheet? 

PPGL sheets are Pre-painted galvalume steel, which is used as color-coated steel with galvalume steel as substrate. PPGL combines the strength of steel with the corrosion resistance of Zinc-Aluminum coating. PPGL sheets have high thermal reflectivity, which also makes them heat resistant. 

What is Pre-painted Steel?

Pre-painted Steel is a bare metal or corrosion substrate that paint has been applied to both sides through a process of continuous coil coating, which gives it a uniform paint finish. The metal is then separated, cleaned, and treated with chemicals. Pre-painted Steel is used in various ways which include garage doors, metal roofing, lighting fixtures, heating and air-conditioning, and appliances. 

What is Pre-painted? 

Pre-painted metal is made by adding film coating or paint to metals, mainly steel and aluminum continuously. This is also called coil coating. 


What is the coil coating process? 

Coil coating is how costing materials are applied to a strip of metals, mainly aluminum or steel. A coil of metal is fed into the process continuously which is controlled with accumulators on both ends. This process includes; 

  • Unwinding and cleaning the coil. 

  • Pre-treatment of the metal surface with chemicals. 

  • Application of coating powders of paints that are laminated or cured with plastic firms. 

  • Cooling and rewinding the coil for shipment.


Galvanized Iron is coated with zinc to enhance durability. At CamaSteel, Galvanized Iron is available for sale. 

Here at Camasteel we have Galvanized Iron (GI) / Pre-painted Galvanized Iron (PPGI) for sale.

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