Home Cosmetic Science Talk Formulating Hair Fragrance impact on Vscosity

  • Fragrance impact on Vscosity

    Posted by Batoul on December 30, 2020 at 11:58 am

    I had a problem with shampoo viscosity when I change the perfume.

    The viscosity with the old frag (at 0.4%) is 39000 cp and I needed 0.2% salt to reach it
    The viscosity with the new frag (at 0.5%) is 16000 and I needed 1.2% salt to reach.

    Can you help me please.
    Thanks

    Andraous replied 2 years, 11 months ago 3 Members · 6 Replies
  • 6 Replies
  • chemicalmatt

    Member
    December 30, 2020 at 9:00 pm

    @Batoul the new fragrance had a solvent/fixative based on n-alkylphenoxy ethers, notorius for crashing viscosity in built surfactant systems. Perhaps use less?  

  • Andraous

    Member
    January 1, 2021 at 3:38 pm

    Viscosity of shampoo should be 4500-7000 cp. So you are on the safe margin. and this is normal some perfume increase the viscosity other decrease it. But you have to do stability test when you changing the perfume 

  • Andraous

    Member
    January 1, 2021 at 3:39 pm

    Andraous said:

    Viscosity of shampoo should be 4500-7000 cp. So you are on the safe margin. and this is normal some perfume increase the viscosity other decrease it. But you have to do stability test when you changing the perfume 

  • Batoul

    Member
    January 3, 2021 at 2:37 pm

    Thank you so much
    I can’t use less frag because I want the shampoo to be well perfumed for marketing issues.
    any suggestions for strengthening the perfume without increasing the % of fragrance used?
     chemicalmatt said:

    @Batoul the new fragrance had a solvent/fixative based on n-alkylphenoxy ethers, notorius for crashing viscosity in built surfactant systems. Perhaps use less?  

  • Batoul

    Member
    January 3, 2021 at 2:40 pm

    Thanks Androus
    In case of doing stability test in normal storage conditions, how much time do I need to consider the shampoo stable?
    Andraous said:

    Viscosity of shampoo should be 4500-7000 cp. So you are on the safe margin. and this is normal some perfume increase the viscosity other decrease it. But you have to do stability test when you changing the perfume 
  • Andraous

    Member
    January 4, 2021 at 6:31 pm

    Batoul said:

    Thanks Androus
    In case of doing stability test in normal storage conditions, how much time do I need to consider the shampoo stable?
    Andraous said:

    Viscosity of shampoo should be 4500-7000 cp. So you are on the safe margin. and this is normal some perfume increase the viscosity other decrease it. But you have to do stability test when you changing the perfume 

    Stability should be 3 months

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