Vaarpu, a trusted casting manufacturer and supplier, has published a comprehensive guide to the different types of cast iron and their industrial applications. Cast iron remains an important engineering material because of its excellent castability, durability, wear resistance, and cost-effectiveness. The guide explores major types of cast iron, including grey cast iron, white cast iron, ductile cast iron, malleable cast iron, and alloy cast iron. It explains their key properties, grades, advantages, limitations, and common applications across different industries. The article also compares grey cast iron and ductile cast iron and provides practical guidance on selecting the right cast iron grade based on load requirements, wear resistance, corrosion exposure, temperature, machining needs, and cost. This resource from Vaarpu is useful for engineers, manufacturers, product designers, and buyers looking to understand cast iron materials and select the most suitable grade for industrial applications.