• General

  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, 10 months ago 4 Members · 8 Replies

  • buffer
  • carbomer
• 8 Replies

• 

  DRBOB@VERDIENT.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.

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  tanelise

  Member

  January 12, 2018 at 8:16 pm

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

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  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!

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  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.

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  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)

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  DRBOB@VERDIENT.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.

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  belassi

  Member

  January 15, 2018 at 3:15 am

  I can’t comment on Ultrez 10, sorry.

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  Doreen

  Member

  January 15, 2018 at 5:18 am

  @DRBOB@VERDIENT.BIZ
  Thanks!  

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