Formulation

I see the formula lose viscosity after 2 days. What can I do to fix it? Thanks
A
Cetyl PEG/PPG-10/1 Dimethicone                                                      2.5
Silica                                                                                                   2
Dicaprylyl Carbonate                                                                           3
ISONONYL ISONONANOATE                                                                 2
Parlem 4                                                                                              6
Phenoxyethanol (and) Ethylhexylglycerin                                            0.9
B
Water                                                                                                74.3
Chamomilla Recutita Flower Extract, Acer saccharum Extract,
Portulaca Oleracea Extract and Butylene glycol                                     2
Arisaema Amurense Extract, Decyl Glucoside, 1,2-Hexanediol             1
KAPPAPHYCUS ALVAREZII EXTRACT                                                      2
Propadiol                                                                                              3
NaCl                                                                                                     1
EDTA                                                                                                   0.2
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Comments

  • PattsiPattsi Member
    high speed
    add a lil xanthan
    add Hydrogenated polyisobutene a bit
    drop diol a bit
    or sub NaCl with Magnesium Sulfate
    should be ok around 1 month or so

    pure KAPPAPHYCUS ALVAREZII EXTRACT 2? or KIRIBIRTH BG 2?

    why w/o?
  • Pattsi said:
    high speed
    add a lil xanthan
    add Hydrogenated polyisobutene a bit
    drop diol a bit
    or sub NaCl with Magnesium Sulfate
    should be ok around 1 month or so

    pure KAPPAPHYCUS ALVAREZII EXTRACT 2? or KIRIBIRTH BG 2?

    why w/o?
    KIRIBIRTH BG, Yes. Thank
  • chemicalmattchemicalmatt Member, Professional Chemist
    I would not add xanthan gum or any other gum or polymer to a water-in-oil (inverse) emulsion such as this one. Easier: reduce propanediol to half that amount and most importantly HOMOGENIZE the pants off this when complete. Bear in mind all inverse-phase emulsions are intrinsically unstable , so don't freak out if you see a little syneresis under stability testing or after six months RT.
  • PharmaPharma Member, Pharmacist
    @chemicalmatt What's the issue with propanediol in w/o? Are other diols better or even worse? That's beyond the horizon of knowledge & experience ;) .
    Some manufacturers and theory say that polymers are actually a good thing (catchword Geltrap). However, it highly depends on the inner surface charge and the polymer's charge as well as the amount polymer:interface -> failure is probably more likely than success if one simply guesses the amount of polymer to add.
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