Tremendously drop of viscosity

Hi, I am facing a problem during producing cream type product, for example, BB Cream. The viscosity of the product drop tremendously as time goes. May I know what is the reason causing the drop in viscosity? Is it homogenization problem or the problems on raw materials?  
Thank you.   
Newbie of formulation
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Comments

  • It is almost impossible to say with just this information. Possibly the pH is drifting; possibly you have insufficient preservation; emulsion failure; many possible causes.
    Cosmetic Brand Creation. Concept to name to IMPI search to logo and brand registration. In-house graphic design inc. Pantone specs. Cosmetic label and box design & graphics.
  • Most times I've seen this very rare effect it has been caused by microbial growth.

  • Bill_TogeBill_Toge Member, Professional Chemist
    it might be one of those factors

    then again, it might be something else entirely
    UK based formulation chemist. Strongest subjects: hair styling, hair bleaches, hair dyes (oxidative and non-oxidative) I know some stuff about: EU regulations, emulsions (O/W and W/O), toothpaste, mouthwash, shampoos, other toiletries
  • PerryPerry Administrator, Professional Chemist
    If you want a better answer, include your formula or at least a list of all the ingredients in your formula.
  • Thank you guys, attached here is my formulation for your reference. Please advise if I should change or take away any problematic ingredients. Thank you very much! 
    Newbie of formulation
  • Please be aware that not everyone uses Microsft Office.
  • Bill_TogeBill_Toge Member, Professional Chemist
    @PeiHoong what's your method of manufacture?

    it looks like a W/Si emulsion, and the stability of those is is very method-dependent
    UK based formulation chemist. Strongest subjects: hair styling, hair bleaches, hair dyes (oxidative and non-oxidative) I know some stuff about: EU regulations, emulsions (O/W and W/O), toothpaste, mouthwash, shampoos, other toiletries
  • @johnb  sorry for that, and here is my formulation: 
    Trade Name Quantity        (%)
    PHASE A  
    LIQUID OIL UV FILTER        11.000
    POWDER UV FILTER          1.550
       
    PHASE B  
    DOW CORNING ES-5612 FORMULATION AID          0.500
    PHENOXYETHANOL          0.500
    BASE 1.0. YELLOW 3AS  
    BASE 1.0. RED 3AS  
    BASE 1.0. BLACK 3AS  
    DOW CORNING ES-5300 FORMULATION AID          1.700
    PHASE C  
    DC 345 FLUID        13.500
    BENTONE 38V           0.300
    TIO2  
    PHASE D  
    DI WATER        46.030
    BUTYLENE GLYCOL 1,3        13.000
    Xanthum Gum          0.200
    SODIUM CHLORIDE          1.000
    ALLANTOIN          0.300
    MICROCARE SB          0.600
    PHASE E  
    VITAMIN E ACETATE           0.200
    Fragrance          0.050
           100.000
    Newbie of formulation
  • @Bill_Toge
    Yes, it is a w/si systm. here is my procedure: 
    1. Phase A is heated to 45'C and then let it cool to room temperature. 
    2. Phase B AND C are premixed and homogenized for 20 minutes. 
    3. Phase A is added to the mixture while homogenizing.
    4. Phase D is premixed and added little by little into the mixture until a w/si is formed.  

    Thank you 
    Newbie of formulation
  • Bill_TogeBill_Toge Member, Professional Chemist
    edited February 2017
    that sounds to me like your Bentone 38V hasn't been properly activated, so there's nothing to stabilise the product's viscosity and rheology; the product brochure from Elementis (page 9-11) describes how to disperse and activate it

    alternatively, you might want to consider using a pre-dispersed form instead
    UK based formulation chemist. Strongest subjects: hair styling, hair bleaches, hair dyes (oxidative and non-oxidative) I know some stuff about: EU regulations, emulsions (O/W and W/O), toothpaste, mouthwash, shampoos, other toiletries
  • As Bill says, solid forms of Bentone require careful "activation" to realise their full potential.

    Predispersed Bentones are far easier to use.
  • chemicalmattchemicalmatt Member, Professional Chemist
    Lose the xanthan gum immediately, and as my esteemed colleagues have suggested use Bentone GEL instead of the raw  Bentone colloid because this was only partially activated if at all. Also keep in mind that virtually all W/Si emulsions are unstable intrinsically over time. "Shake before using" on your label will help here too. And, oh yeah, homogenize but do not over-homogenize this or it will fail.
  • yea, thanks all for the advice and i will try to revise the formulation and bentone handling method. 

    Thank you very much!!

    Newbie of formulation
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