Stabilising Quaterniums in a hair milk

Hi All,

I am having difficulty stabilising a hair milk using quaterniums. In particular Quaternium-6.
Without it the formula seems to be stable...

Water to 100%
Microcrystalline Cellulose & Cellulose gum & Xanthan gum - 0.5%

oils (vegetable) - 6%
emulsifier emulium melifera MB (Polyglyceryl-6 Distearate (and) Jojoba Esters (and) Polyglyceryl-3 Beeswax (and) Cetyl Alcohol) - 1.8% 

Preservative - Benzyl Alcohol, Dehydroacetic Acid - 0.75%

Anything that I can add to help stabilise quats? Not allowed to use PEGs unfortunately. Or any emulsifiers which are natural an may be more effective? 

Thanks
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Comments

  • Bill_TogeBill_Toge Member, Professional Chemist
    xanthan gum and cellulose gum are both anionic, so they're inherently incompatible with quats: the quickest and easiest solution would be to use a different thickener
    UK based cosmetic chemist with 13 years' experience at the bench. I've worked with pretty much everything apart from pressed powders, soap, solid lipstick and aerosols.
  • Hi Bill
    Ok great thanks I didnt know that they were incompatible with quats! Thanks for that. I added them thinking they were stabilising the product.
    Thanks again
  • kotkot Member, PCF student
    Hi Bill, could you advise which one to use, please?
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