A C-Purlin is a structural component shaped like the letter “C.” It is widely used in construction for supporting roofs, walls, and frames. C-Purlins are available in various sizes and thicknesses, but the 3mm thick galvanized C-Purlin stands out due to its strength and durability. The galvanization process involves coating the steel with zinc to prevent corrosion, making it ideal for both indoor and outdoor applications.