Soap/Lye Calculators; A guide

Discussion in 'Lye-Based Soap Forum' started by IanT, Mar 31, 2008.

Help Support Soapmaking Forum by donating:

?

Did you find this post helpful?

  1. Yes

    72.5%
  2. No

    11.6%
  3. Unsure/Undecided

    5.8%
  4. Yes

    7.2%
  5. Unsure/Undecided

    2.9%
  1. Feb 5, 2014 #81

    seven

    seven

    seven

    Well-Known Member

    Joined:
    Nov 14, 2013
    Messages:
    2,672
    Likes Received:
    1,403
    yer welcome. yes, more water means more time to "play" with the batter. this can benefit you if using a temperamental fo for example, or doing intricate swirls/lotsa colors.

    also, temp matters too. soaping at higher temp can give you quicker trace, thus i like to soap rt (room temp).
     
  2. Feb 6, 2014 #82

    ilovesoap2

    ilovesoap2

    ilovesoap2

    Well-Known Member

    Joined:
    Dec 26, 2013
    Messages:
    254
    Likes Received:
    99
    Great! Thank you so much :)
     
  3. Feb 10, 2014 #83

    Willow42

    Willow42

    Willow42

    New Member

    Joined:
    Aug 12, 2011
    Messages:
    4
    Likes Received:
    0
    Help please

    I am new to CP soapmaking and I am using a recipe from my suppliers website. I need to double the recipe but not sure how to work out how much lye I need. I have looked at some lye calculators and I'm getting very confused as to how to work it out. This is the recipe below, can someone please help me with this. Thanks

    INGREDIENTS (excluding colour & fragrance)
    12 oz (340g) of cold, clean water
    125g of sodium hydroxide (caustic soda) beads or pearls
    1lb (454g) olive oil (preferably pomace grade but virgin or extra virgin will do)
    10oz (284g) coconut oil (hard variety)
    6oz (170g) palm oil (hard variety)
    1/4 tsp vitamin E oil
     
  4. Feb 10, 2014 #84

    The Efficacious Gentleman

    The Efficacious Gentleman

    The Efficacious Gentleman

    Lifetime Supporter

    Joined:
    Nov 19, 2013
    Messages:
    8,906
    Likes Received:
    8,829
    Location:
    Austria
    From the point of view of lye to oils, this is fine.

    Might be a bit too much coconut oil if you have sensitive or easily dry skin. If so, make a post with some details and lots of hints will come up
     
  5. Feb 10, 2014 #85

    Willow42

    Willow42

    Willow42

    New Member

    Joined:
    Aug 12, 2011
    Messages:
    4
    Likes Received:
    0
    Thank you The Efficacious Gentleman, I wouldn't just double the lye though if I was doubling the recipe would I???
     
  6. Feb 10, 2014 #86

    Saponista

    Saponista

    Saponista

    Well-Known Member

    Joined:
    Dec 16, 2013
    Messages:
    2,116
    Likes Received:
    1,311
    Location:
    Plymouth, Devon, UK
    If you want to double the recipe using exactly the same oils, then yes you would double the lye. You just double everything.
     
    Willow42 likes this.
  7. Feb 10, 2014 #87

    Willow42

    Willow42

    Willow42

    New Member

    Joined:
    Aug 12, 2011
    Messages:
    4
    Likes Received:
    0
    Thank you Saponista :)
     
  8. Feb 10, 2014 #88

    Saponista

    Saponista

    Saponista

    Well-Known Member

    Joined:
    Dec 16, 2013
    Messages:
    2,116
    Likes Received:
    1,311
    Location:
    Plymouth, Devon, UK
    I concur with efficacious gentleman that there's a bit much coconut oil in that recipe though. I would find it a bit harsh on my sensitive skin.
     
  9. Feb 10, 2014 #89

    Saponista

    Saponista

    Saponista

    Well-Known Member

    Joined:
    Dec 16, 2013
    Messages:
    2,116
    Likes Received:
    1,311
    Location:
    Plymouth, Devon, UK
    I would add some castor oil to improve bubbles and creaminess and drop the %coconut down. Many other people will have hugely varying ideas of what makes a good bar of soap though. It's down to personal preference but I would have a play with some small batches using different ratios of oils until you get something you are happy with.
     
  10. Feb 10, 2014 #90

    Willow42

    Willow42

    Willow42

    New Member

    Joined:
    Aug 12, 2011
    Messages:
    4
    Likes Received:
    0
    So if I put some castor oil in would I reduce the amount of coconut oil by the same amount of castor oil I would put in?
     
  11. Feb 10, 2014 #91

    Saponista

    Saponista

    Saponista

    Well-Known Member

    Joined:
    Dec 16, 2013
    Messages:
    2,116
    Likes Received:
    1,311
    Location:
    Plymouth, Devon, UK
    You need to use a lye calculator if you change the oils in the recipe. Each oil takes a different amount of lye to completely react with it. Have a go with soap calc. I know it looks daunting but it's really easy once you get the hang of it. In box 2 put the amount of oils you want in the recipe. If you want double the batch you made before just add up the oil weight, double it and put that number into the box. Leave box 3,4 and 5 as they are (you can learn how to use those afterwards) add the oils you are interested in in box six and play around with the percentage of those oils in your recipe. Click calculate which is number 7 and view or print recipe it will open you up a new box telling you all the things you need for your recipe. There will also be a box telling you different soap qualities and where your soap number falls within that range. Play around until you get the hardness creaminess etc, that you want. I would just print out a new recipe for you with castor but you will become so much more confident if you do it yourself.
     
  12. Feb 10, 2014 #92

    Saponista

    Saponista

    Saponista

    Well-Known Member

    Joined:
    Dec 16, 2013
    Messages:
    2,116
    Likes Received:
    1,311
    Location:
    Plymouth, Devon, UK
    Post up your recipe and I'm sure lots of people including me will check you have your numbers right.
     
  13. Mar 8, 2014 #93

    ExplodingPie

    ExplodingPie

    ExplodingPie

    Member

    Joined:
    Mar 4, 2014
    Messages:
    16
    Likes Received:
    2
    Is Trader Joes's virgin coconut oil 76 degrees or 92 degrees melt point?
     
  14. Mar 8, 2014 #94

    FlybyStardancer

    FlybyStardancer

    FlybyStardancer

    Well-Known Member

    Joined:
    Jan 30, 2014
    Messages:
    1,367
    Likes Received:
    565
    Location:
    SF Bay Area, CA
    All virgin coconut oil is 76deg.
     
  15. Apr 16, 2014 #95

    scottief

    scottief

    scottief

    Well-Known Member

    Joined:
    Apr 14, 2014
    Messages:
    80
    Likes Received:
    21
    I have a quick question about the MMS Calculator. Im new to soap making and we made our 2nd batch last night. When using MMS the water about was 13-19 ounces. How do I know how much water to add when it tells me to use between the certain amounts.

    I was at a soap store yesterday and she printed me off a recipe with MMS and she told me to use the number 5 lye on the chart. thanks
     
  16. Apr 16, 2014 #96

    The Efficacious Gentleman

    The Efficacious Gentleman

    The Efficacious Gentleman

    Lifetime Supporter

    Joined:
    Nov 19, 2013
    Messages:
    8,906
    Likes Received:
    8,829
    Location:
    Austria
    The water amount can vary depending on what you want to do. It needs to be at least the same weight as the lye, but generally people use different amounts of water depending on the soap and the circumstances. To start off with, go more towards the higher amount than the lower - it makes it easier to dissolve the lye in the water, for one thing!

    As for the "5 on the chart" - I think you mean a 5% superfat. That's pretty standard for many recipes, but there are often times that we would want to go above or below that
     
  17. May 22, 2014 #97

    saffy

    saffy

    saffy

    Member

    Joined:
    Jul 17, 2013
    Messages:
    12
    Likes Received:
    1
    Last time I looked, which was a while ago admittedly, these lye calculator sites failed to provide any source references for their SAP values. When I contacted them replies were generally along the line of 'based on historic values' but still no actual references. One site did suggest a recently published book which apparently gives sources.

    In the end I used the SAP values stated in the Codex Alimentarius (a formal document of international food standards started in 1964 by the FAO and WHO) and set up my own spreadsheet to calculate NaOH required for my recipes.
     
  18. May 23, 2014 #98

    seven

    seven

    seven

    Well-Known Member

    Joined:
    Nov 14, 2013
    Messages:
    2,672
    Likes Received:
    1,403
    do you have a link to it? i am curious to see, and so far i can only find the sap for KOH, and not NaOH (in the Codex).
     
  19. May 26, 2014 #99

    saffy

    saffy

    saffy

    Member

    Joined:
    Jul 17, 2013
    Messages:
    12
    Likes Received:
    1
    SAPs and converting from KOH to NaOH

    Seems most SAPs are worked out for KOH so you need to convert to NaOH.

    Work out your KOH SAP based on your oil proportions.

    Then determine NaOH needed by multiplying your KOH SAP by 39.997/56.106 (or 40/56) which comes from:


    Sodium hydroxide, Molar mass = 39.997 g/mollPotassium hydroxide, Molar mass = 56.1056 g/mol

    The Codex Al. gives a SAP range - I took the top of the range for each oil which is higher than values returned by the online calculators I have tried. Mine have all worked fine - I have tested batches with an industrial quality certified pH probe (the pH strips are not appropriate for soaps) and all pHs fine - they compare well to commercial bar soap which I also pH tested out of interest.

    I also spent a headbreaking couple of hours working out theoretical stoichiometrical SAP values based on the Codex Al. fatty acid profiles for each oil - and was amazed that they compared well with the practical determinations which in most cases were done a long time ago. My previous life as an analytical chemist helps no end!

    According to a very helful gentleman at the [FONT=verdana,geneva]The Federation of Oils, Seeds and Fats Associations (FOSFA) - SAP testing is a thing of the past and most quoted values will be somewhat dated - which raises the question of the relevance of these SAP values today given the modernisation of farming, processing and storage methods and subsequent potential for changes in the fatty acid profiles of the oils we use?
    [/FONT]
     
    reinbeau likes this.
  20. Oct 13, 2015 #100

    Punkin2x74

    Punkin2x74

    Punkin2x74

    Active Member

    Joined:
    Sep 26, 2015
    Messages:
    34
    Likes Received:
    28
    I like to use soapee.com you can save, edit, share its really nice.
     
    notapantsday likes this.

Share This Page