I found a bit more info for the person who asked about the differences in irons.
http://www.grandperfumes.com/how-to-use-a-flat-iron
Flat Iron
Flat Irons are modern hair straighteners that has a heating element, like a heating plate on either side, made up of ceramic materials, aluminium, Nano silver, Titanium Oxide, Tourmaline, Iron etc, cased in a plastic holder with a plastic or rubber handle. It comes in various vibrant and cool colors and also in various sizes according to the person’s kind and volume of hair. It is highly efficient, safe and quicker than the hot combs or heated rods. They are used to style hair to make them straight, curly, straight pony, bun, upsweep etc. Thermal Protectors are used to protect hair from harsh effects of high temperature.
Ceramic Flat Iron
Ceramic flat Irons are hair straighteners which use ceramic heaters, on either side of the clamp, which is mixed with materials like titanium and tourmaline to boost the output.
Most ceramic flat irons are made with aluminum or titanium coated with ceramic layers. More the ceramic layers, more flexible it is to use according to the need and style and more precise to choose the temperatures. But such Flat Irons might damage the hair if the ceramic layer is worn out.
Despite being expensive, it is beneficial to use pure ceramic Iron, provided it is handled carefully. Invisible Infrared rays are used in all ceramic flat irons that employ far infrared heating. Nano materials like Nano silver to inhibit bacterial growth, Nano titanium for even heat distribution in hair and Nano titanium oxide to inhibit chemical reactions are added to the ceramic layer. Tourmaline is also added to boost negative ion output to produce smooth and sleek hair styles.