Battery Straightener

A: While some straighteners are battery-operated, most plug into an electrical source. The iron's heating element converts the electrical current from the source to heat that is transferred to the hair via the flat iron's plates.
The plates can be made of a variety of materials including ceramic, metal, ceramic-coated, tourmaline, or even coated with rubber or silicon, to name a few.
The two most popular materials used for salon-quality straighteners are ceramic-coated and titanium.

A: Ceramic - ceramic plates distribute heat evenly, reduce frizz, and are gentle on the hair. They work well for most hair types.
Tourmaline - tourmaline is often used to coat ceramic plates. It produces negative ions that help seal the hair's cuticle, reducing frizz and enhancing shine.
Titanium - titanium plates heat up quickly and maintain a consistent temperature. They are ideal for thick, coarse hair that requires high heat.
Ionic - these flat irons emit negative ions to neutralize positive ions in the hair, reducing frizz and static. They are often combined with ceramic or tourmaline plates.
Floating plates - while not a material, some flat irons have floating plates that adjust to the hair's thickness, ensuring even pressure and heat distribution.
Gold or titanium alloy - some high-end flat irons feature plates made from a gold or titanium alloy, which provides fast, even heating and durability.

A: High-quality straighteners allow you to set the temperature of the heat, which can range from 140 to 450 degrees Fahrenheit.
Depending on the texture and current health of your hair, maximum heat isn't always necessary. In fact, 365 degrees Fahrenheit is often cited as the best temperature for hair straightening or curling.