I have been having some minor issues with a cream that is Montanov 202 based (INCI: Arachidyl Alcohol (and) Behenyl Alcohol (and) Arachidyl Glucoside) and supported by Glyceryl stearate citrate.
As I was reviewing the re-packers description for GSC it says:
Stable emulsions from pH 5.5 - 8.0.
If that is accurate...that is a pretty small window to formulate in!?
When I go on ULP....the Mfg says this:
(GSC is) Well suited for making emulsions with a
slightly acidic pH-value (corresponding to
the natural pH-value of human skin)
I had been targeting a 5.0 pH. Is this out of the suitable range of GSC?
Funny thing is....Evonik has some combo emulsifiers (with GSC) that have this tag:
It is suitable for the formulation of O/W creams
and lotions with all types of cosmetic oils at a
pH of 3.5 to 8.5.
So does the pH range of GSC...depend on what it is partnered with? Independently, the window is small...but at a co-emulsifier....the window can be opened a great deal? Mont 202 says it can go down to 3.0 pH.
Guess what I am ultimately asking is.... Is a pH of 5.0 acceptable for an emulsion using M 202 and supported by GSC? (Just for the record...a little Aristoflex and Carbomer in there as well.)