Home Cosmetic Science Talk Formulating Crystallization Problem

Tagged: 

  • Crystallization Problem

    Posted by 1501 on September 1, 2020 at 3:35 am

    Hi, I made a simple water-based solution and the crystallization is observed after about 1 week. In the solution, the tiny particles (like dust) appear. Do you know what happend?
    Here is formula:
    1, Water            
        EDTA.2Na:     0.1
        S
    odium Cocoamphoacetate:  2
    2, Fragrance:      0.2
        Liceryl 12 (INCI: Glyceryl Linoleate (and) PEG-12 Oleate):  0.6
    3, Saliguard EHGP:    0.6
        Propylene Glycol:   4

    pharma replied 3 years, 5 months ago 4 Members · 5 Replies
  • 5 Replies
  • chemicalmatt

    Member
    September 2, 2020 at 4:07 pm

    Mystery there. Nothing jumps out at me and everything appears to be miscible. Perhaps add a bit more amphoteric and see what occurs. That is the hydrotrope here.

  • pharma

    Member
    September 2, 2020 at 6:49 pm
    What’s the pH and did you put it (accidentally) in the fridge?
    Else, nothing suspicious.
  • 1501

    Member
    September 3, 2020 at 2:07 am

    Pharma said:

    What’s the pH and did you put it (accidentally) in the fridge?
    Else, nothing suspicious.

    The pH is about 7-7.2 
    I put 1 sample in room temperature and another in incubator (45 degree C).
    Both have crystallization after 5-7 days

  • ketchito

    Member
    September 3, 2020 at 1:29 pm

    @1501 Maybe that level of sodium cocoamphoacetate might not be enough to keep some of your “oils” soluble. Can you try increasing it, replacing it by Laureth-7 or 9, or adding a solubilizer?

  • pharma

    Member
    September 3, 2020 at 7:21 pm
    Weird…
    Do a knock-out test.

Log in to reply.