What is the typical pH range of alkaline perms?

The typical pH range of alkaline perms is between 8.0 and 9.5. This higher pH level is essential because it allows the cuticle layer of the hair to open up more effectively, enabling the perm solution to penetrate the hair shaft. This increased penetration is vital for breaking down the disulfide bonds in the hair, which are then reformed into a new shape when neutralized.

Alkaline perms contain ammonium thioglycolate, an ingredient that works best within this pH range. The actual chemistry behind the process requires this higher alkalinity to encourage the necessary changes in the hair structure, leading to effective curling or waving. Understanding the specific pH range is crucial for stylists to ensure that they achieve the desired texture and longevity of the perm while minimizing potential damage to the hair.