Home Cosmetic Science Talk Formulating TEA limits

  • TEA limits

    Posted by em88 on June 19, 2018 at 12:54 pm

    Greetings,

    I was wondering if there is any limit in concentration about using TEA in shampoo. According to Handbook of excipients, they mention a limit of 5% but for emulsions/creams. I tried to google about this topic, but not that much luck. Do you have any info regarding this?

    Thank you

    em88 replied 5 years, 10 months ago 5 Members · 13 Replies
  • 13 Replies
  • Duncan

    Member
    June 19, 2018 at 1:02 pm

    http://ec.europa.eu/growth/tools-databases/cosing/index.cfm?fuseaction=search.results&annex_v2=III&search

    2.5% limit for leave on products in the EU, not sure if that applies to total addition or free amine content.

    5% TEA ? that’s a hell of a lot. Any particular reason for that?

  • OldPerry

    Member
    June 19, 2018 at 2:56 pm

    This CIR report says 5% for leave-on is max. They don’t list a max for rinse-off products.  https://online.personalcarecouncil.org/ctfa-static/online/lists/cir-pdfs/pr594.pdf

  • em88

    Member
    June 19, 2018 at 3:54 pm

    Can’t believe I missed the cosmetic ingredient database. Thanks
    From my tests the quantity of TEA ,to regulate the pH, is around 3%. I may use NaOH, but TEA was an easier and cheaper alternative. 
    @Perry, do you mind attaching that pdf here, I don’t have an account at the site you linked.
    Thank you Duncan and Perry

  • OldPerry

    Member
    June 19, 2018 at 8:13 pm

    I don’t think an account is required.

    Go to https://www.cir-safety.org/ingredients

  • OldPerry

    Member
    June 19, 2018 at 8:14 pm
  • DAS

    Member
    June 19, 2018 at 11:52 pm

    The On-Line INFOBASE is a paid subscription service that is only available to Council members.  :( 

    Why would you need that much for a shampoo?. 

  • em88

    Member
    June 20, 2018 at 6:53 am

    @Perry, both links worked! Thank you
    @DAS, I have to neutralize the shampoo in the end.  

  • em88

    Member
    June 20, 2018 at 2:11 pm

    Tried a sample, where I reduced TEA to 2% and added 0.5% of NaOH 20%. It worked fine. 
    I’ll try a few more combinations like this 🙂

  • Chemist77

    Member
    June 20, 2018 at 2:28 pm

    How acidic is the shampoo that you require such high amounts of alkalis to bring it to the acceptable pH level or is it a neutralising shampoo for some post keratin/acidic hair straightening treatment. 

  • em88

    Member
    June 21, 2018 at 8:21 am

    The pH is 3.5 but in the end I have to have the pH of the shampoo 7 in order for the API to be stable, 

  • Chemist77

    Member
    June 21, 2018 at 9:52 am

    In that case you definitely need a good amount, have you thought of AMP-95. A very good one that though bit on expensive side. 

  • Duncan

    Member
    June 21, 2018 at 12:32 pm

    Could just use a solution of 10% sodium hydroxide. As a rule of thumb 10% sodium hydroxide has the same pH adjusting ability as TEA.
    If your Naoh solution is stronger / weaker just pro-rata it
    It’s also a hell of a sight cheaper :)

    Only reason I’d choose TEA (or AMP) is if I was making a hydroalcoholic carbomer gel. Sodium hydroxide tends to haze out in those, TEA or AMP being organic are more compatible with the alcohol

  • em88

    Member
    June 21, 2018 at 2:21 pm

    @Chemist77, unfortunately I don’t have that ingredient in my lab. I will ask for it for the future projects where price is not set very low. Thank you

    @Duncan, I was thinking to use NaOH only for the next trial, because i suspect TEA increases the viscosity more than I need. Right now the viscosity is 6.8 cP.
    Thanks for the tip regarding hydroalcoholic gels. 🙂

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