Phenoxyethanol and sodium benzoate incompatibility

After some research I decided to use phenoxyethanol and sodium benzoate as preservative for my Shampoo and lotion.

Is these any incompatibility or reduction of efficacy of these two preservatives with any of following ingredients.

SLES
CAPB
Alkyl polyglycoside
HPMC
HEC
Xanthan gum
Polyglyceryl 6 distearate

Comments

  • AbdullahAbdullah Member
    @Pharma @PhilGeis any comments on this.

    Lotioncrafter says: Benzoic acid is inactivated by non-ionic surfactant.

    Makingcosmetics says: Phenoxyethanol should not be used in formulas containing HE-cellulose or non-ionic surfactants. 

    One another website said phenoxyethanol is deactivated by highly ethoxylated surfactants. Does this include SLES or ALES?

    Thanks in advance
  • PhilGeisPhilGeis Member, Professional formulator
    I'd run an AET to see.
  • AbdullahAbdullah Member
    @PhilGeis sure but if there is any known incompatibility it is better to know and change that i ingredient or preservation system. 
  • PhilGeisPhilGeis Member, Professional formulator
    There is potential.  Think you're referring to info in Steinberg's book.  Dave's info is excellent and does report there is potential. compromise.

  • AbdullahAbdullah Member
    edited May 4
    @PhilGeis im am referring to information in makingcosmetics website about phenoxyethanol and sodium benzoate incompatibilities. 

    can you tell me the book name or the info? 

    I already decided to replace HPMC with guar gum because of it's incompatibility with phenoxyethanol in shampoo to stabilize pearlizer EGDS. 
  • PhilGeisPhilGeis Member, Professional formulator
    Their info prob came from Dave Steinberg's book - Preservatives for Cosmetics.  This is a very good book.  https://www.amazon.com/Preservatives-Cosmetics-David-C-Steinberg/dp/193263312X/ref=sr_1_4?dchild=1&keywords=steinberg+preservatives&qid=1620126997&sr=8-4
  • AbdullahAbdullah Member
    @PhilGeis thanks
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