• Formulating

  Preservative,benzyl alcohol, sodium benzoate, potassium sorbate.

  Posted by Kioko on September 26, 2018 at 3:12 pm

  i am having challenges finding the correct usage rate for benzyl alcohol, sodium benzoate, potassium sorbate, as preservatives. Kindly guide, would these make a stable product specifically shampoo and conditioner.

  belassi replied 6 years, 6 months ago 3 Members · 4 Replies
• 4 Replies

• 

  belassi

  Member

  September 26, 2018 at 3:50 pm

  sodium benzoate in shampoo, 0.4%, pH <=5, never had a failure. Potassium sorbate is OK in coloured shampoos, it will go a yellow colour over time.

• 

  Kioko

  Member

  September 26, 2018 at 4:10 pm

  Hi @Belassi, thank you, how about benzyl?  i was using a 0.2% rate up from 0.1%

• 

  Gunther

  Member

  September 26, 2018 at 10:23 pm

  @Belassi do you know if it’s Potassium itself the one that becomes yellow
  or it’s other substances in the formulation turning yellow upon exposure to K sorbate?

• 

  belassi

  Member

  September 27, 2018 at 4:56 am

  @Gunther - not really, but I strongly suspect it is the sorbate.
  @Kioko - have not tested that in shampoo.

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