Hi All
Just looking for some general guidelines for when pH Is not relevant
Ie how much water is needed in a formula to get a accurate pH?
I am making a face cleanser with a high concentration of oils and surfactants it leaves 45% water.
Is there a need to measure and adjust pH?
Same for w/o emulsions is pH relevant?
Comments
as the conductivity decreases (whether this is due to a lack of ionic salts, or the presence of non-conductive co-solvents), the measured pH readings will become less accurate, less consistent and less meaningful overall
in anhydrous products and W/O emulsions, the continuous phase generally has little to no electrical conductivity, so any readings are essentially meaningless
Ok thanks Bill_Toge yes thats what I was taught so in general manufacturers I know dont even bother reading the pH of w/o or adjusting pH....