Home Cosmetic Science Talk Formulating Hair Is lithium hydroxide as strong as lye?

  • Is lithium hydroxide as strong as lye?

    Posted by DaveStone on April 27, 2022 at 11:00 pm

    And why doesn’t it need a base like calcium hydroxide does?

    Bill_Toge replied 1 year, 11 months ago 4 Members · 5 Replies
  • 5 Replies
  • Pharma

    Member
    April 28, 2022 at 4:38 am
    It’s nearly as alkaline as sodium hydroxide.
    Calcium hydroxide is slightly less alkaline (still medium-strong though) but foremost it’s very poorly water soluble and henceforth doesn’t act as a strong base under certain conditions.
  • DaveStone

    Member
    April 28, 2022 at 5:11 am

    Pharma said:

    It’s nearly as alkaline as sodium hydroxide.
    Calcium hydroxide is slightly less alkaline (still medium-strong though) but foremost it’s very poorly water soluble and henceforth doesn’t act as a strong base under certain conditions.

    Which would work better as a relaxer? I’ve rarely seen lithium used…whereas calcium and lye are most common. I wonder why.

  • Pharma

    Member
    April 29, 2022 at 8:29 am
    Higher price and toxicity?
    Also, it’s behaviour is different… not sure how (better or worse in a relaxer?).
    It’s likely having a better penetration which would weaken hair to the core.
  • PhilGeis

    Member
    April 29, 2022 at 9:42 am

    Counter ions can make a difference in some applications, but it’s hard to understand why.  K hypochlorite is more effective than Na hypochlorite in Tilex-type products  but more expensive.

  • Bill_Toge

    Member
    April 29, 2022 at 6:01 pm
    also, the reason calcium hydroxide relaxers have to be mixed with guanidine carbonate before use is because they form guanidine hydroxide when mixed
    although it’s highly effective and less caustic than mineral hydroxides, it’s also chemically unstable, so it has to be formed in situ

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