TKL News

Galvanized (G.I.) and Black (B.I.) Iron Sheet

by TKL Steel Corp. May 13, 2022

There are two types of metal sheets used in construction, the Galvanized Iron or G.I. and the Black Iron (B.I.) Sheet. The G.I. Sheet is a metal sheet coated with protective metallic and organic coatings that prevents rust. This is commonly used in automotive, wind, and solar industries. While the B.I. Sheet is made up of copper and aluminum. It is commonly used as a material for gate, and gutter fabrication.


TKL offers G.I. and B.I. Sheets in various gauge or thickness in 4 by 8 feet size with ready stocks available. We also accept 6 x 20 feet orders.

G.I. Sheet (mm) –  #26, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.8, 2.0, 2.2

B.I. Sheet (mm) – 0.5, 0.7, 0.9, 1.1, 1.3 (CR), 1.3 (HR), 2.0 2.3, 2.6, 3.0, 4.0, 5.0, 6.0, 7.5, 9.0, 10.0, 11.0, 15.0, 19.0, 25.0

TKL Steel Galvanized Iron and Black Iron Sheet

TKL Steel GI Sheet


Uses of G.I. and B.I. Sheets


G.I. and B.I. Sheets have various uses in the construction sector.  Here are some of the common applications.


G.I. Sheets

  1. Door and wall panels

G.I. Sheets are used in fabricating door and wall panels due to its flat surface.


2.  Roofing

G.I. Sheets have protective coating that make it an ideal material for roofing.


3.  Home appliances

G.I. Sheets are also commonly used in home appliances as it is lightweight and can last for a long time.

Uses of GI Sheet

B.I. Sheets

  1. Air condition and refrigeration systems

B.I. Sheets are used in cooling systems as it is lightweight and quite resistant to corrosion.


2.  Automotive

B.I. Sheets are used in the automotive industry as flooring due to its thickness and sturdiness.


3.  Outdoor billboards

B.I. Sheets are used for outdoor billboards due to their aesthetic qualities.

 Uses of Black iron sheets (B.I.)

Advantages of using G.I. and B.I. Sheets

G.I. and B.I. Sheets are commonly used in various construction projects due to the following benefits:


  1. Malleable

G.I. & B.I. sheets are malleable as it can be designed into a new shape without breaking.


2.  Long-lasting

The lifespan of G.I. & B.I. sheets can last up to 50 years or more depending on how you clean or maintain it.


3.  Cost-efficient

Compared to other construction materials, G.I. & B.I. sheets have a low cost making it an ideal material to use in construction if you have a limited budget.


4.  Faster construction time

Since G.I. & B.I. sheets are ready to use, you can easily assemble and prepare it to use for construction.

Advantages of using galvanized and black iron sheet


10 real benefits of Galvanized Steel. Galvanizers Association of Australia. (n.d.). Retrieved April 27, 2022, from

Steel, T. (2022, April 11). 10 benefits of Galvanized Steel. Tampa Steel & Supply. Retrieved April 27, 2022, from

Lyons, K. (2019, July 5). Advantages and disadvantages of carbon steel (mild steel). MetalCut4u. Retrieved April 27, 2022, from