low viscosity in peroxide cream

Hi every one:

I have problems making a peroxide cream, the formula is very simple:

Lanette SX                                    4.3 p/p%

60 % hydrogen peroxide              7.62 p/p%

metal chelator                             0.02 p/p%

Fragrance                                     0.0038 v/p%


To make, i mix the lanette with water (metal chelator previously solved) at 65 °C and homogenize  it. Then it's cooled and at this point everything is right, but when I add the hydrogen peroxide (once the mix is at 25°C) the cream loses viscosity, and becomes completely liquid. I know this formula has been used before with no inconvenients, so it's really confusing for me.

my hypothesis are:

Reaction of peroxide: I dont see any bubbles, so i think it is unlikely.

Mistakes in procediment: as i said, this method has been used before, why it did not happened then?

Quality of wax: I dont know if it is possible .


Any help would be apreciated. Thanks

 

Comments

  • Bill_TogeBill_Toge Member, Professional Chemist
    it's very likely that you're over-shearing the product when you're add peroxide; there's not much wax in the formula, and nothing that will help the viscosity recover quickly once it's been sheared
    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
  • juliojulio Member
    thank you Bill. Agitation is gentle when the peroxide is added, and the addition is made carefully at a small rate. Can you recommend me some product to achieve the viscosity recovering you mention? 
  • Bill_TogeBill_Toge Member, Professional Chemist
    try cetearyl alcohol; you've already got an emulsifying wax in there so it should mix in easily

    also, I'd suggest using a 35% solution of peroxide rather than a 60%, as it's safer and easier to handle
    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
  • juliojulio Member
    ok, I will try it. thanks a lot!
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