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What is Pre-painted Galvanized Iron and How to Use It?

What is Galvanized Iron?

Galvanised Iron (GI) is a metal alloy; either steel or iron, that has a layer of protective zinc coating applied to the surface to prevent rust. Prized for its protective steel properties in its zinc coated form, GI makes the perfect finished steel product for the industrial and construction industry. The most commonly used processing method, which we use here at Camasteel, is through hot-dip galvanizing.

Galvanized Iron (GI) Galvanized Iron (GI)

Pre-painted galvanized iron (PPGI) is another form of GI, formed in a similar process. The process is extended where it refers to factory pre-painted alternative to the zinc coated steel. The hot dip metallic coating process, where the iron is submerged in molten zinc is typically used to coat steel sheet and coil which may all be factory pre-painted like PPGI.

Learn more about PPGI by watching our youtube video below:

  • What is Prepainted Galvanized Iron (PPGI)?
  • What is Galvanized Iron (GI)?
  • How to purchase PPGI in bulk
  • How is PPGI made?
  • What is PPGI used for?

What is Galvanized Iron (GI) and Pre-Painted Galvanized Iron (PPGI)?

PPGI (pre-painted galvanized iron)

PPGI is color coated GI steel, sold in coils or sheet forms, including profile sheets and plain sheets. It is one of many steel products offered here at Camasteel. This pre-painted steel has characteristics of high durability, and resistance against adverse weather and UV rays from sunlight. PPGI is also light weight, with usage cutting across various industries, such as transportation, advertising and construction.

Pre painted galvanised iron (PPGI) coil manufacturer from coated steel coil manufacturers. PPGI coil for construction.

What Is a PPGI Coil?

PPGI coil is a rolled-up form of the color steel sheets. Besides, it is a great investment project, because it can be further processed for different uses. Prepainted galvanized steel coil often weighs from 3 to 5 tons. Although, at Camasteel weight is customisable according to your needs.

Prepainted Galvanized Iron (PPGI) coil Prepainted Galvanized Iron (PPGI) coil

What Is a PPGI Sheet?

A PPGI sheet is the sheet form of the pre-painted steel coil. It is a derivative product of color galvanized coils after shearing, profiling, etc. It is a kind of semi-finished or finished product, which can be for suppliers or end-user direct use. We can find PPGI plain sheets and profile sheets, both of which allow for customisation of the length, width, designs, etc.

(PPGI) Galvanized Color Coated Sheet- PPGI roofing sheet (PPGI) Galvanized Color Coated Sheet- PPGI roofing sheet

What Are Different Uses of a PPGI Steel coil?

There are many different forms of a PPGI steel coil, such as galvanized pipes, steel wires, car parts and frames. Due to the diverse options, GI color coated sheets is utilized in many commercial and industrial instances:

1. Building

PPGI can be used in buildings, and have varied applications; the exceptional strength and dimensional accuracy of Pre-painted  Galvanized Iron coils optimizes the finished product result for, ceiling accessories, lighting, interior cladding and much more:

  • Fences
  • Ceilings
  • Wall cladding
  • Doors
  • Decorative panels
  • Pet enclosures
  • Bus stops


2. Transport

PPGI can be used for both internal and exterior parts for automobiles and more. As a highly valued Chinese steel manufacturer, with a wealth of connections to steel suppliers who operate globally, we can benefit from the durability and corrosion resistance of PPGI, which maximizes ROI for transport.

  • Trains and other vehicles
  • Containers
  • Shells


3. Home Appliances

PPGI can be utilized to manufacture home appliances, such as the side door plate of freezers and refrigerators, DVD player set shells, LED TV’s air conditioners, microwave ovens and washing machines. Their durability means the steel products being sold offer increased value to the end user!

4. Solar Energy

PPGI can be used in the solar energy industry, typically, to manufacture storage tanks of solar water heaters, alowith with related parts. Technological advancements led to the development of self-cleaning PPGI steel products featuring increased hydrophilic properties and anti-contamination abilities.

Camasteel applies the properties to our PPGI products to ensure contaminants such as dust can be washed away by rain when connecting with the surface of these products.

5. Furniture

PPGI can be used to build furniture, this is because it has high-quality three-dimensional designs, is cost effective, high precision steel designs, nano-environmental technology, and more.

It is particularly attractive for being a steel alternative to replicate wooden and marble designs effectively! Pre-painted Galvanized Iron is also very effective as a thermal insulation wallboard and can particularly maximize interior design efforts! Other uses of PPGI (prepainted galvanized steel coil) for the furniture industry are:

  • Wardrobes
  • Lockers
  • Tables
  • Bookshelves
  • Beds
  • Cabinet side panels


6. Electrical Cabinets

PPGI can be used to build electrical cabinets, which in turn are used to store and preserve electrical or electronic equipment.

What is PPGI Material?

The material structure of the pre-painted galvanized steel coil is composed of galvanized sheets as a metal base, with zinc coating serving as a layer. The overall thickness of Camasteel PPGI is 0.12mm to 2.0mm:

1. The Base Metal

The base metal in PPGI is usually cold-rolled steel, Camasteel uses a hot-rolled technique which gives the galvanized iron its strength and durability.

2. Coating

A hot dip metallic coating process is applied to coat the steel sheet and coil. In this hot dip galvanizing method, the base metal is submerged into molten zinc to add the protective coating.

3. Pretreatment

Chemical pretreatment, otherwise known as chemical conversion treatment is where       the chromate coating is added for extra protection.

4. Primer & Top Paint

In prepainted galvanized iron, the product is painted before the hot dip metallic coating process.

5. Protective Layer Thickness

Whilst the back paint thickness is roughly 5-20μm, the top paint thickness is 10-25μm. This helps to ensure the longevity of the product's beauty and use.

PPGI sheet metal components PPGI sheet metal components

What Paint Is Used on Galvanized Iron?

The paint coating material used on galvanized iron is polyester (PE) and the color of the back paint is white gray. The color can be customized according to our Camasteel color chart, directly adapted from the RAL color deck. Camasteel also offers customisations here; special patterns can be made, e.g. wood grain, camouflage, brick. Check out RALs color chart - tap the image to see the full range of RAL colours! At Camasteel we can personalise your PPGI to these colours and much more:

RAL Color Coating options for PPGI and other Steel Products

How To Choose a Pre-painted Galvanized Steel Coil?

Choosing the correct pre-painted steel coil can be achieved by first assessing your natural environment, along with use environments, and structural characteristics of the building to match the appropriate steel grade are among the most important things to consider when choosing an appropriate pre-painted steel coil to match with the required specifications.

How to measure the performance of the Color Coated Steel coil?

This is determined by properties of the chosen material (yield strength, elongation and malleability), performance of metallic coating, considering the metallic coating type, girth, and adherence, and coating performance; coating species, color, sheen, endurance, workability, etc.

Environmental considerations for Color-coated steel sheets

The main consideration for the selection of color-coated steel sheets is geographical due to weather implications and how corrosive the environment may be.

Due to the beauty and durability being a key selling point for the use of PPGI on civil buildings, it is imperative that the coating resists discoloration and pulverization.

How to calculate PPGI Sheet Price?

To understand the pricing of PPGI, you must first understand the characteristics and what to look for. The specifications of the prepainted galvanized iron will be an indicator of the price.

The thinner the base steel thickness, the higher the price of the ppgi steel coil, because the processing cost becomes higher. As a wholesaler, we will offer discounts for bulk-buy orders, book a call to hear our latest offer and promotions!

How to calculate the weight of a PPGI sheet?

You can calculate the weight of your PPGI sheet steel, with just four pieces of data:

  • Length
  • Width
  • Thickness
  • Density

Length (m) * width (m) * thickness (mm) * density = (kg/pcs)is the ultimate formula for accurate measurement!

To ease the process, we have listed the densities of metals commonly bought in coil and sheet form:

Material Density (g/cm³)
Steels 7.85
Stainless steel 7.9
Aluminum 2.7
Iron 7.87
Zinc-titanium 7.2
Copper 8.93

Density variations in painted, alloy, or coated steels are minute and can be disregarded. It is imperative that any end results arrived at via self-calculation or utilizing steel calculator tools online, should be considered estimations, rather than exact calculations.

How do I know the weight of my coil?

The approximate coil weight can be determined by measuring the Density (D), Thickness (T), along with the Outside (OD), and Inside Diameter (ID).

Measuring the weight of PPGI coil (diagram) Measuring the weight of PPGI coil (diagram)

What are the Advantages of Using Pre-painted Galvanized Iron?

The first would have to be the Intact zinc coating on GI by Camasteel that prevents corrosive substances from breaching the surface of the underlying steel or iron. This longevity and resilience make PPGI the perfect building material!

What is the Difference Between PPGI and PPGL?

The differences between PPGI and PPGL can be analyzed  with regards to substrates, durability, weight, appearance, features, applications and price:

● Features

PPGI uses a galvanized steel substrate as base metal. These galvanized sheets have a layer of zinc coating. However, PPGL uses galvalume cold-rolled steel sheets as a substrate. Galvalume sheets for PPGL are coated in 55% aluminum, 43.3% zinc, and 1.6% silicon.

PPGL sheets have a higher resistance against PPGI sheets, due to the dense layer of aluminum, which prevents the base metal from eroding.

● Appearance

The surface of a PPGL sheet is smoother than PPGI sheets. This is because aluminum is more adhesive than zinc.

● Durability

PPGL is 3x more durable than PPGI; AI-ZN coating in PPGL is more resistant to corrosion, in comparison to the ZN-rich in PPGI.

● Weight

Due to the lesser weight of aluminum when compared to Zinc, PPGLs AI-ZN coating is lighter than PPGIs zinc coating. Although, AI-ZN coating can occupy 3% more space than the GI sheet, even with the same weight.

● Applications

PPGI and PPGL can be used for industrial and commercial purposes, including; automobiles, wall paneling, roofing etc. However PPGL is more suitable for adverse outdoor environments, due to its high corrosion resistant features.

● Price

PPGI sheets are 3%-11% lower in cost than PPGL sheets, due to varied, but minute reasons of process and material variance, durability and feature differences.

Which Color-Coated Profile Sheet is Better, PPGI or PPGL?

PPGI steel coil proves more aesthetically pleasing due to the color and smooth appearance. It is light in weight, making it cheaper and easier to transport, especially in bulk! PPGL on the other hand is more expensive but the product lasts longer.

PPGL can also withstand up to 315 ℃ temperatures, due to the higher density aluminum coating. Book a quick consultation/take a look at our pricing breakdown page to see how we can customize the selection and distribution process for you!


PPGI is a well-rounded and multifunctional steel product. Ultimately design life and environment, along with the specifications should help you make your final choice.

We also offer a consultancy service for those who need extra information and assistance when buying from us. Email us to speak with one of our specialists as soon as today!

All in all, there are many uses for pre-painted galvanized iron and there are many intricacies involved in its procurement. Consultancy from an efficient PPGI manufacturer like Camasteel can help to minimize confusion in your buying journey. Don’t forget to leave any further questions in the comments below.

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