Home Cosmetic Science Talk Formulating benzyl alcohol equivalent to parabens

  • benzyl alcohol equivalent to parabens

    Posted by andres_mh89 on April 21, 2021 at 5:18 pm

    Hello everyone,

    I’m looking forward to use benzyl alcohol as a substitute for methyl and propyl paraben (both 0.1%) in a pet shampoo formulation.

    My question is, what would be the equivalent amount of benzyl alcohol for this application?

    Many thanks
    Andres

    Microformulation replied 3 years, 6 months ago 6 Members · 11 Replies
  • 11 Replies
  • Paprik

    Member
    April 21, 2021 at 7:16 pm

    Hi,

    what else are you using as preservative? What else is in the formula?

    EU limit for benzyl alcohol is 1% max. 
    We can’t really tell you, for example, that 0.78% or 0.48% would be enough. PET would need to be conducted. 
    If it’s homemade, I would stick to the upper limit, however benzyl alcohol wouldn’t be sufficient as the only preservative. In other words, it’s not a broad spectrum preservative. 

    Hope that helps.

  • andres_mh89

    Member
    April 21, 2021 at 8:51 pm

    Hi Paprik,

    I forgot to mention, I’m also including 0.1% of KATHON CG. Therefore, what could be a solid estimate of the % for benzyl alcohol to guarantee a shelf life for, let’s say 2 years?

  • RedCoast

    Member
    April 22, 2021 at 7:19 am

    Do you know of any commercial pet shampoos that are paraben-free? If you look at the ingredients list, you can get a good idea on how they accomplished it.

  • PhilGeis

    Member
    April 22, 2021 at 11:24 am

    With Kathon CG in a shampoo - Sodium benzoate is a much better option than benzyl alcohol or parabens. Kathon CG at 0.1 is top recommend use level.  Unless there’s a rationale, think I’d drop that to 0.5-0.6.

  • Abdullah

    Member
    April 22, 2021 at 12:15 pm

    @PhilGeis do you mean use kathon at %0.05 or %0.5?

    What percentage of sodium benzoate should be used with %0.05 kathon in this Shampoo formula?
    SLES
    CAPB
    Glycol distearate %1
    PQ10

    NACL
    Tetrasodium EDTA %0.2
    pH 5
  • PhilGeis

    Member
    April 22, 2021 at 1:26 pm

    Right - 0.05.-0.06 - thanks!
    Suggest 0.25 -0.3% Na Benzoate

  • Abdullah

    Member
    April 23, 2021 at 4:00 am

    @PhilGeis thank you too!
    How about %0.3 Glyceryl Caprylate with %0.05 kathon in this formula? 

  • Microformulation

    Member
    April 23, 2021 at 2:32 pm

    You may want to reconsider Kathon CG (methylchloroisothiazolinone, methylisothiazolinone) in a Pet Shampoo. There are some pending class action suits. It also is beginning to get pushback from the pet market. I would research these issues.

  • PhilGeis

    Member
    April 23, 2021 at 8:24 pm

    You may want to reconsider Kathon CG (methylchloroisothiazolinone, methylisothiazolinone) in a Pet Shampoo. There are some pending class action suits. It also is beginning to get pushback from the pet market. I would research these issues.

    Can you elaborate on the lawsuits?  This is the most common preseravtive of surfactant based human consumer products (shampoos, hand washes, body washes) in the world.

  • PhilGeis

    Member
    April 23, 2021 at 9:36 pm

    Saw one suit for flea and tick shampoo - pyrethroids named as culprit.
    Also some stuff about isoxazoline  - another heterocyclic but nowhere near an isothiazolinone.  https://www.fda.gov/animal-veterinary/animal-health-literacy/fact-sheet-pet-owners-and-veterinarians-about-potential-adverse-events-associated-isoxazoline-flea

    any cocnern for a formaldehyde releaser?

  • Microformulation

    Member
    April 23, 2021 at 10:43 pm
    I will tag in @Belassi

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