What is the pH range for acid perms?

The correct pH range for acid perms is typically between 4.5 and 5.5. This acidic range allows for a gentler curl formation, making acid perms suitable for finer or more damaged hair. Acid perms use a weaker formula than alkaline perms, resulting in less swelling of the hair shaft and providing more control over the curling process without the harshness that can accompany higher pH solutions.

Acidic perms achieve this lower pH through the use of glyceryl monothioglucolate and are designed to work at a more delicate balance, which benefits clients looking for a softer, more natural wave.

Understanding the specific pH levels for different types of perms is essential for cosmetologists to ensure they choose the appropriate system based on the client's hair type and desired outcome. Knowing the correct pH range helps in achieving the best possible results while maintaining the integrity of the hair.