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  • Buffer system for urea in a product with ph 8

    Posted by jpgrace on August 11, 2017 at 4:13 pm

    Hello All,

    Looking to buffer urea in a body wash with a ph of 8.
    Based on pK, citric is used only up to ph 6 and lactic only good to 4.8.

    I should note that  the body wash contains African black soap as a label ingredient and so must have pH of at least 8.

    Of course I will be experimenting, but any advice on buffering urea could save me much time and aggravation.

    Thank you! 

    DRBOB@VERDIENT.BIZ replied 6 years, 10 months ago 2 Members · 5 Replies
  • 5 Replies

    August 13, 2017 at 8:48 pm

    If you have soap in formula, you do not need a buffer as the former is a good buffer:you are at PH 8 so you should have some free  fatty acid which is even better.

  • jpgrace

    August 14, 2017 at 10:58 am

    Dr Bob,
    Thank you, you are brilliant! 


    August 14, 2017 at 2:28 pm

    you are welcome and kind to say that

  • jpgrace

    August 14, 2017 at 9:31 pm

    Hi Dr Bob,
    Just an update, after 7 days my pH has gone from 8 to 8.2.  I am using 4% soap in the formula and end up with a pH of 8.5, adjusted to 8 with lactic acid.
    At this point, I may just send it to production without urea, but will continue experimenting.  Thought I would share, since you were kind enough to help me.


    August 15, 2017 at 3:03 pm

    Thanks Ph should level out at 8.0-8.2 in stability study-cheers

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