• Formulating

  Viscosity

  Posted by 1Armand2 on March 21, 2021 at 1:00 am

  Hi to all!
  Question:  Can we reduce the viscosity of a shampoo
  by just adding water? Will this affect its efficacy?
  Thanks a lot

  OldPerry replied 4 years ago 3 Members · 2 Replies
• 2 Replies

• 

  ngarayeva001

  Member

  March 21, 2021 at 11:07 am

  This question has no answer. A shampoo made of what? If you are trying ti dilute ready product with water it’s a bad idea for multiple reasons.

• 

  OldPerry

  Professional Chemist / Formulator

  March 21, 2021 at 1:08 pm

  If you are talking about a finished product, sure you can add water to reduce the viscosity of shampoo.

  However, adding water will also…

  1.  Reduce the concentration of surfactant so it won’t clean as well
  2.  It also won’t foam as well
  3.  Reduce the concentration of preservative so it will be more prone to microbial growth

  It could also destabilize any type of colloidal / emulsion system that may be present.

  Generally, it’s not a good idea.

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