Hair by Irina Lavrega

Friday, 24 March 2017

pH of the hair

pH(potential hydrogen)
The pH scale is used from 0(acidic) to7(neutral) to14(alkaline).
Virgin Hair pH=3.67
Scalp pH=5.5
Water pH=7.0
Skin pH=5.5
Pediatric shampoos “no-tear” pH=7.0

Alkaline pH (any product applied on hair that has pH higher than 3.67) may increase the negative electrical charge of the hair fiber surface and increase friction between the fibers. This may lead to cuticle damage and fiber breakage. It is a reality and not a myth that lower pH of shampoos may cause less frizzing for generating less negative static electricity on the fiber surface.
This is one of the reasons why we use conditioners.  Conditioners have positively charged polymers (cations) that will quench those negative charges.  They deposit on the hair and at the same time they provide lubrication to the fibers among other things
After using a shampoo of pH higher than 5.5, conditioner of low-pH should be applied so that besides lubricating, the electrostatic forces can be neutralized, the frizz effect eliminated and cuticle scales may be sealed.