* Aluminum: Lightweight, good heat conductivity, and relatively inexpensive. Often found in newer radiators.
* Steel: Durable, resistant to corrosion, and can be readily formed into different shapes. Often found in older radiators.
* Cast iron: Heavy, excellent heat retention, and long-lasting. Historically very common, but less prevalent now due to weight and cost.
The specific metal used in a radiator will depend on factors like the age of the radiator, its intended purpose, and the manufacturer's preferences.
