Hello Chemist experts!
I am new to the forum as well as making my new formulas. Please excuse any amateur mistakes and in my approach to this question.
Through educating myself online with basic chemistry literature I have attempted to create my own waterbased pomade. Today I have a successful formula with the texture, scent and effect that I wish for however the product goes rancid after a couple of days due to lack of a preservative.
Based on a 100 Gram batch:
Water 52 G
Beeswax 20 G - 52.6 % of oil base - 6.31 hlb value
Jojoba oil 7 G - 18.4 % of oil base - 1.11 hlb value
Candellila wax 5 G - 13.2 % of oil base - 1.91 hlb value
Shea butter 4 G - 10.5 % of oil base - 0.84 hlb value
Coconut oil 1 G - 2.63 % of oil base - 0.21 hlb value
Vitamin E 1 G - 2.63 % of oil base - 0.16 hlb value
Total oil base HLB value: 10.54
10% of total formula
Peg- 40 Hydrogenated Castor Oil 6.5 G - 6.5 % of Total
Soy Lecithin 3.5 G - 3.5% of total
Emulsifier mix HLB value 10.6
Essential Oils 10-15 drops
How can I add a good preservative to my formulation to keep it free from fungus, mold and microbes to increase shelf life (hopefully a couple of months) ? How can I calculate the ratio ? I have been looking into potassium sorbate do you think this would be a suitable preservative ? Please keep in mind that I am trying to make a "natural" as possible product.
P.S this is only for my personal use.
Thank you for your help.