Help with formula, clay mask - preservative

Hello everyone, 

Thank you for letting me into the group. I wanted to get some help with a formula for a clay mask that I am developing. I know that clay masks are notoriously difficult to preserve, however, this is my passion and really want to get this right!

This is the formula:

A

0.4% Xanthan gum

0.1% citric acid

0.1% vitamin A 

4% Dipropylene glycol 

4% Vegetable Glycerin


B

heat water to 50oC 

40% Aqua 

1% Panthenol


C

3% Rosa Demascena Flower Water

5% Aloe barbadensis Juice

2% Hamamelis virginiana 

0.2% Tocopherol 

0.1% Parfum

0.2 Potassium Sorbate

0.8% Benzyl Alcohol

1% Phenoxyethanol

 2% Allantoin

28% French Pink Clay

1% Botanicals


I wanted to know if this is a good formula and if it will preserve the clay with these percentages and method. Any tips improving how well the clay will preserve and any changes I need to make with the percentages.

Thank you so much in advance! 

Comments

  • chemicalmattchemicalmatt Member, Professional Chemist
    @okaforify I'd call this well preserved given the water activity, as long as the final pH is <5.5 or that sorbate won't do much good. A bit heavy if anything. With clay products it is always best to add the preservatives before the clays. Kaolin and other clays may adsorb certain preservatives such as benzyl alcohol.

  • @okaforify I'd call this well preserved given the water activity, as long as the final pH is <5.5 or that sorbate won't do much good. A bit heavy if anything. With clay products it is always best to add the preservatives before the clays. Kaolin and other clays may adsorb certain preservatives such as benzyl alcohol.

    thank you for your help, what do you mean a bit heavy? as in there are too many ingredients in the mask?

    Ok great, I have been adding the preservatives in the water phase, so I'm hoping that'll prevent bacteria/fungi! 

    thank you :) 
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