Phase Inversion - Chemists Corner

Formulating

Phase Inversion

Posted by Rufiano on May 6, 2024 at 3:35 am

Anybody know what causes phase inversion of w/o cream to o/w cream?

To ask for ur help, thank you everyone.

Rufiano replied 5 days ago 4 Members · 13 Replies
13 Replies

geepee

Member
May 6, 2024 at 6:03 pm

Is this happening to one of your formulas? If so:

What are your ingredients and phases?
What is your method?

Then I can see what you might be missing in your formula and help from there.
- Rufiano
  
  Member
  May 6, 2024 at 10:52 pm
  
  Here’s the formula:
  
  Aquadest
  
  Glycerin
  
  Chlorpenesin
  
  Cetyl Alc
  
  Glyceryl monostearate
  
  Glycol cetearath
  
  Span 80
  
  Plurol oleique
  
  IPM
  
  Mineral Oil
  
  ZnO
  
  Can you help me what is wrong with my formula?
  
  Thanks a lot
Rufiano

Member
May 6, 2024 at 10:55 pm

I’ve done accelerated stability test (at 60 celcius), and my cream experienced a phase change after 3 weeks…
- PhilGeis
  
  Member
  May 7, 2024 at 10:05 am
  3 weeks at 60C? This is excessive - relevance to real life long term aging is highly doubtful.
  - This reply was modified 1 week, 4 days ago by PhilGeis.
  - Rufiano
    
    Member
    May 7, 2024 at 9:46 pm
    
    Sorry i didnt get it, what do you mean excessive? the temperature, isn’t it?
    - geepee
      
      Member
      May 7, 2024 at 9:50 pm
      
      60C is too hot, most stability tests are done at 40C
      - Rufiano
        
        Member
        May 7, 2024 at 10:03 pm
        
        It’s about my R&D SOP in my company & i always use that temperature for acccelerated test, for other product too
        
        But geepee, can you tell me whats wrong on my formula? am i using too much w/o emulgator?
        
        Previous, i once used mgso4 for stabilizer at water phase but the result was same, stable on 3 weeks only.
        
        PhilGeis
        
        Member
        May 8, 2024 at 4:22 am
        
        3 weeks at 60C is BS. If that’s the only condition that causes the issue - then you have no issue. T
        
        Some officious clown in your company has you guys wasting your time and energy for no benefit.
ketchito

Member
May 7, 2024 at 8:55 am

Hi. Could you write the proper INCI for Glycol cetearath? Also, it’ be nice to know at least how much of this and of Span 80 you’re using, as well as the amount of your oil phase and some details about your manufacturing process.
- Rufiano
  
  Member
  May 7, 2024 at 9:51 pm
  
  I used Emplilan EGMS with the INCI is Glycol cetearath.
  
  Here’s:
  
  Cetyl OH 2%
  
  Gms 4%
  
  Glycol cete 1%
  
  Span 80 2%
  
  Plurol 3%
  
  Do i use too much emulgator??
  - Rufiano
    
    Member
    May 7, 2024 at 9:54 pm
    
    My formula is about 75% water phase & 25% oil phase.
    
    And i add the water phase to oil phase ad 70 C…
ketchito

Member
May 10, 2024 at 6:17 am

Since it’s a w/o emulsion, are you adding the water phase very very slowly? Also, w/o emulsions require some inorganic salts for stabilization.
- Rufiano
  
  Member
  May 13, 2024 at 11:17 pm
  
  Yes, i am adding the water phase to oil phase slowly (drops by drops using pipet) and i used mgs04 as electrolyte stabilizer in water phase