INSULATORS:Insulators work as protectors. They may protect heat, sound and the passage of electricity. Thermal insulators, sound insulators and electrical insulators are used for various reasons, from keeping houses warm to protecting electrical wires and soundproofing rooms. Depending on what you plan to use an insulator for will depend on which type of insulator to use.
Cooking utensils, kettles, saucepans and boilers are usually made of aluminum or stainless steel where direct heating is involved.
-Soldering iron rods are made of iron with the tip made of copper because copper is a much better conductor of heat than iron.
-Heat exchangers such as those used in a laundry enable precious fuel to be saved.