I am currently selling a rinse off conditioner with
0.9% stearamidopropyl dimethyl amine
2% cetyl alcohol
0.2% Amodimethicone active
Lactic acid to pH 4.1
0.05% Formalin+ 1 ppm CMI MI as preservative
I want to make another conditioner with claims that you can rinse is after 1 minute or one hour or leave it there and don't rinse.
I cant use the current preservative system because of CMI MI for leave on.
Phenoxyethanol will reduce the viscosity, make compilations, increase the cost and it targets bacteria like formalin. So not an option.
The best option will be to preserve it with formalin alone or combined with very small amount of CMI MI.
1. Is Formalin alone enough to preserve this conditioner at pH 4.1?
if yes at what percentage?
Packaging is in 400ml bottle with flip top cap.