Which type of permanent wave processes at room temperature?

The ammonia-free wave is processed at room temperature because it uses a different chemical formulation than other types of waves. This wave typically incorporates a milder alkaline solution that allows the hair to be permed without the need for the heat that other waves may require. By being able to process at room temperature, this type of wave minimizes damage to the hair, making it a gentler option for clients with sensitive hair or for those who prefer a less harsh chemical experience.

In comparison to other types, such as alkaline waves that usually require heat for optimal results, or acid waves that generally need a warm environment but still achieve their curl through slightly higher acidity, the ammonia-free wave stands out for its ability to achieve desired results without elevating temperatures. The exothermic wave generates its own heat during the chemical reaction, making it temperature-dependent as well. Therefore, the emphasis on a room temperature process is what distinctly characterizes the ammonia-free wave and highlights its advantages in certain applications.