Home Cosmetic Science Talk Formulating General Buffer for carbomer cream

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  • Buffer for carbomer cream

    Posted by doreen on January 12, 2018 at 11:48 am

    Does the pH of a cream shift over time?
    If so, what buffer would you recommend for carbomer creams in a pH range between 5-6?

    doreen replied 6 years, 2 months ago 4 Members · 8 Replies
  • 8 Replies
  • drbobverdient-biz

    Member
    January 12, 2018 at 6:38 pm

    You asked two questions-the first is yes creams depending upon composition can and do exhibit a Ph shift.Carbomer based creams do not usually exhibit a PH shift at 5.5 to 6.0 using TEA. Should the need arise a small amount of 0.1 M citric acid buffer should stabilize the cream. but use as little as possible due to electrolyte sensitivity.

  • tanelise

    Member
    January 12, 2018 at 8:16 pm

    Good to know bc I’m planning on making a carbomer cream

  • doreen

    Member
    January 13, 2018 at 7:23 pm

    @DRBOB@VERDIENT.BIZ
    Thanks. I actually never use TEA to neutralize, mostly NaOH in different concentrations.

    @tanelise
    The only disadvantage of carbomers is their sensivity to electrolytes, but for the rest they’re absolutely superior to gums, like xanthan!
    I now have the Ultrez 10 and ETD 2020 (Lubrizol) and I’m still getting to use these, but I absolutely love the sensorials!

  • belassi

    Member
    January 14, 2018 at 2:24 am

    I think that 940 has better sensorials than Ultrez 20 but it is much more difficult to hydrate.

  • doreen

    Member
    January 14, 2018 at 4:01 pm

    @Belassi
    Ok, thanks! You mean better than the Ultrez 10? (I don’t have Ultrez 20)

  • drbobverdient-biz

    Member
    January 14, 2018 at 4:42 pm

    Ultrez 30 will provide better electrolyte tolerance and deliver sensorials similar to Ultrez 10:also very easy to work with.

  • belassi

    Member
    January 15, 2018 at 3:15 am

    I can’t comment on Ultrez 10, sorry.

  • doreen

    Member
    January 15, 2018 at 5:18 am

    @DRBOB@VERDIENT.BIZ
    Thanks! :-) 

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