Home Cosmetic Science Talk Formulating Cyclopentasiloxane and Dimethicone Crosspolymer? Do I need a Preservative?

  • Cyclopentasiloxane and Dimethicone Crosspolymer? Do I need a Preservative?

    Posted by Anonymous on June 7, 2016 at 4:49 pm

    Hello! 
    New…Well not quite new, I’ve been browsing this forum for quite some time. But this is my first question!

    I am making a loose eye shadow containing the following ingredients. Will I need to add a preservative?

    Mica
    Dimethicone
    Isosodecane
    Cyclopentasiloxane and Vinyl Dimethicone Crosspolymer
    Myristyl Myristate

    Thank you for your help 🙂 

    manstra replied 7 years, 9 months ago 4 Members · 6 Replies
  • 6 Replies
  • Anonymous

    Guest
    June 7, 2016 at 4:55 pm

    PS- If so I would be using Phenoxyethanol, Caprylyl Glycol, Potassium Sorbate, Hexylene Glycol.

    I’m just trying to limit ingredient usage.

  • bobzchemist

    Member
    June 7, 2016 at 5:09 pm

    Same basic rule - unless you’re making something for your own personal use that will be kept in a refrigerator and never be used by anyone else, you need a preservative in everything. No exceptions.

    Unless, of course, you enjoy being sued…

  • microformulation

    Member
    June 7, 2016 at 9:50 pm

    Never limit Ingredient usage at the risk of safety. It is quite easy for an experienced Formulator to identify what ingredients provide a benefit and what is in there for Marketing story. To even consider not using a preservative simply to “limit ingredient usage” is missing the big picture. Don’t let Marketing lead your Formulating as the primary factor.

  • oldperry

    Member
    June 8, 2016 at 10:02 pm

    Especially for a product that is supposed to be used around the eye area!
    Using a contaminated product could blind someone.

  • Anonymous

    Guest
    June 8, 2016 at 10:08 pm

    Thank you! Much appreciated. 

  • manstra

    Member
    June 12, 2016 at 12:22 pm

    Although your formula has no water doen’t mean it has no humidity around. Humidity makes fungi and moulds thrive even if it is only on the surface of a product. Phenoxyethanol/caprylic glycol (Verstatil PC for eg) should be in the formula.

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