Percentage of sodium hydroxide

Discussion in 'Beginners Soap Making Forum' started by Nivisoaps, Feb 22, 2020.

Help Support Soapmaking Forum by donating:

  1. Feb 22, 2020 #1

    Nivisoaps

    Nivisoaps

    Nivisoaps

    Member

    Joined:
    Jan 30, 2020
    Messages:
    14
    Likes Received:
    4
    Location:
    Chennai
    How does the percentage of Naoh affects quality of a soap.. 38%or 40%.. what is the difference?

    And I recently purchased some handmade soaps.. I didn't like them as they give a pungent smell .. is this normal?
     
  2. Feb 22, 2020 #2

    dianaabuela1

    dianaabuela1

    dianaabuela1

    Active Member

    Joined:
    Jan 16, 2020
    Messages:
    25
    Likes Received:
    7
    I did my first batch, I think I calculate wrong the amount of lye water. Did trace but I checked today and looks really soft. Can I fix it? Or I need to give a longer time to cure? Can I add more lye solution to that batch?
     
  3. Feb 22, 2020 #3

    shunt2011

    shunt2011

    shunt2011

    Staff Member Admin

    Joined:
    Apr 3, 2012
    Messages:
    14,020
    Likes Received:
    8,247
    Location:
    Michigan
    What do you mean percentage of NAOH. Are you talking about lye concentration? If you’re running your recipe through the soap calculator the lye amount will not change unless adjusting the superfat. If it’s the lye concentration the only thing that will change is the amount of water/liquid needed.
    The pungent smell, are you talking about the fragrance? You can make your soap with little to no fragrance.

    @dianaabuela1 you May want to start a new thread so people can respond to your issue specifically. Has nothing to do with this thread. Welcome.
    More info needed. Your recipe and processs.
     
  4. Feb 23, 2020 #4

    Nivisoaps

    Nivisoaps

    Nivisoaps

    Member

    Joined:
    Jan 30, 2020
    Messages:
    14
    Likes Received:
    4
    Location:
    Chennai
    What will be the difference in soap if I make a recipe with 38% lye concentration and another one with 40% concentration without changing the rest of contents.
     
  5. Feb 23, 2020 #5

    cmzaha

    cmzaha

    cmzaha

    Supporting Member

    Joined:
    Sep 19, 2011
    Messages:
    10,535
    Likes Received:
    9,116
    Location:
    Southern California
    The only difference is the liquid required.
     
  6. Feb 23, 2020 #6

    DeeAnna

    DeeAnna

    DeeAnna

    Well-Known Member

    Joined:
    Feb 20, 2013
    Messages:
    11,925
    Likes Received:
    16,141
    Location:
    Northeast Iowa, USA
    The NaOH (lye) weight does not change if you change the "water as % of oils" setting, lye concentration, or water:lye ratio. These settings only change the amount of water in the recipe.

    The NaOH weight is determined by the kind of fats in your recipe, the weight of those fats, and the superfat (lye discount) setting you choose. If those three things stay the same, the NaOH weight stays the same too, no matter what you do to the settings for lye concentration or water:lye ratio or "water as % of oils".

    It's easy to see this for yourself --

    Set up a recipe say 1000 grams of coconut oil. Or any other blend of fats. It doesn't matter what the superfat setting is - ignore it.

    Set the Water:Lye ratio to 3. Calculate the recipe. Write down the weights of NaOH and water.

    Change ONLY the Water:Lye ratio to 2. Recalculate the recipe.

    Compare the weights of NaOH and water for this version to the first.

    Again, change only the water:lye ratio to 1 and compare.

    What numbers are changing? What numbers are staying the same?
    You can do the same test with "water as % of oils" and "lye concentration". See for yourself what happens when you change these settings.
     
    dianaabuela1 and shunt2011 like this.
  7. Feb 23, 2020 #7

    penelopejane

    penelopejane

    penelopejane

    Well-Known Member

    Joined:
    Sep 19, 2015
    Messages:
    5,103
    Likes Received:
    3,747
    Location:
    Sth Coast, NSW, Australia
    Very little. If you make a soap with 28% lye concentration there will be a lot more water in the mix and it will take longer to firm up, longer to cure, longer to get hard and may warp.

    Varying the amount of the lye concentration (less water) MAY speed up trace.
     
    dianaabuela1 and Nivisoaps like this.

Draft saved Draft deleted

Share This Page

Group Builder