When to add Preservatives - Formulating Hair Wax

Good day chemists,

i have a query regarding formulating my own hair clay wax.

should i add in the Preservatives as the last step or the essential oil blend first follow by preservatives.

One last thing, is there a way to find out the shelf life of my products. 

Looking forward to your valuable input.



  • BelassiBelassi Member, PCF student
    It doesn't really matter.
    To find the shelf life, leave them on the shelf for a few years... I think I still have some usable hand cream that's five years old.
    Cosmetic Brand Creation. Concept to name to IMPI search to logo and brand registration. In-house graphic design inc. Pantone specs. Cosmetic label and box design & graphics.
  • FekherFekher Member, Professional Chemist
    @Louiswch the add of preservative should be at end cause making wax needs hot process so adding preservative shoud be at the cool down step.
  • @Fekher do you have any suggestion perhaps at what temperature should you pour the essential oil and preservative? Thank you
  • FekherFekher Member, Professional Chemist
    edited July 2019
    @hayno28 almost below to 60 degree C but it depends on the type of preservative and essential oil.
  • PerryPerry Administrator, Professional Chemist
    To determine shelf life you have to conduct a stability test and microbial challenge test.

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