Brendamona
New Member
Hi everyone I am new to cold process made 5 batches I forgot to add my castor oil to a batch does that mean I should not use ? And will it be too lye heavy ? Thank you in advance Brenda
Estee, please Introduce yourself in the Intro forum seeing this is your first post.So castor has a SAP value of NaOH = 0.128
Sounds like you were using not only a 5% superfat value -- and 5% castor.
So what it really comes down to is : the other 95% of the oils..... and their SAP values.
For example Olive oil has a SAP value of 0.135
Solid 76 coconut oil has a sap value of 0.183... if you used oils with really high SAP values you are probably OK --
EXAMPLE:
If your recipe was:
35% coconut oil 350 grams (sap values .183 with 0% super fat)
5% castor 50 grams (sap value .128 with 0% super fat)
60% Sunflower 600 grams (sap value .135 with 0% superfat)
Lye required = 350x.183 + 50x.128 + 600x.135
= 64.05 + 6.4 + 81
= 151.45 grams of lye <== for 0% superfat
At 5% super fat the the lye required is: 143.84 grams with 1000 grams of oil <you need to use the 5% superfat SAP values -- or work with 95% of the oil for the calculation but put in 100% of the oil in the recipe mix >==>
Example of 95% soaponifcation (also called 5% superfat)
= 350 x .95 x .183 + 50 x .95 x .128 + 600 x .95 x.135
= 60.85 + 6.1 + 76.95
= 143.9 grams
What this formula is saying is: I'm going to us 350 grams of coconut oil, but I want only 95% of the coconut oil to become soap, there will not be enough lye for the remaining 5% of the coconut to soaponify (deliberately) so this 5% will become a superfat. Same concept for the other 2 values.
To drive this point home: with 5% superfat of all the oils you put in: say 500 grams of oils -- you want only 500 x .95 ==> 475 grams to be used to make the soap, the other 5% ==> 500 grams x .05 = 25 grams of oil will be floating around in your bar of soap and is considered the superfat. So at 5% superfat the amount of lye you put in is just enough to soaponify 95% of your oils. Likewise at 10% superfat you only put enough lye in to soaponify 90% of your oils.
Now you make this recipe and you forgot the CASTOR...but your at 5% superfat so you used 143 grams of lye
Now your "unintended" recipe is:
35% coconut oil 350 grams (sap values .183 with 0% super fat)
60% Sunflower 600 grams (sap value .135 with 0% superfat)
Lye required = 350x.183 + 600x.135
= 64.05 + 81
= 145.05 grams of lye <== for 0% superfat
You used 143 grams of lye..... which means you are OK .... that is you could have used up to 145.05 grams of lye and expected all the lye to be used up (no crystals - crystals happen when all the lye is not used up... or your don't mix well, and all the lye is not used up)... you have a 2.5 gram buffer. You should be fine. Clearly if you used more than 145.05 grams of lye you might have issues. I say might because even withing sunflower oils, they are not all created equal and the TRUE SAP value for one sunflower oil might be .1357 while another might be .1341 ... that is the SAP values provided are not for a particular SUNFLOWER oil manufacture and the SAP value can still vary between manufacturers. Soapers who want to work at less than say 2% superfat probably need the exact SAP value for the BRAND of oil they are using... not just the type of oil -- they might need a manufacturers SPEC sheet or something.
Best of LUCK !!!
Welcome to the forum.So castor has a SAP value of NaOH = 0.128
Sounds like you were using not only a 5% superfat value -- and 5% castor.
So what it really comes down to is : the other 95% of the oils..... and their SAP values.
For example Olive oil has a SAP value of 0.135
Solid 76 coconut oil has a sap value of 0.183... if you used oils with really high SAP values you are probably OK --
EXAMPLE:
If your recipe was:
35% coconut oil 350 grams (sap values .183 with 0% super fat)
5% castor 50 grams (sap value .128 with 0% super fat)
60% Sunflower 600 grams (sap value .135 with 0% superfat)
Lye required = 350x.183 + 50x.128 + 600x.135
= 64.05 + 6.4 + 81
= 151.45 grams of lye <== for 0% superfat
At 5% super fat the the lye required is: 143.84 grams with 1000 grams of oil <you need to use the 5% superfat SAP values -- or work with 95% of the oil for the calculation but put in 100% of the oil in the recipe mix >==>
Example of 95% soaponifcation (also called 5% superfat)
= 350 x .95 x .183 + 50 x .95 x .128 + 600 x .95 x.135
= 60.85 + 6.1 + 76.95
= 143.9 grams
What this formula is saying is: I'm going to us 350 grams of coconut oil, but I want only 95% of the coconut oil to become soap, there will not be enough lye for the remaining 5% of the coconut to soaponify (deliberately) so this 5% will become a superfat. Same concept for the other 2 values.
To drive this point home: with 5% superfat of all the oils you put in: say 500 grams of oils -- you want only 500 x .95 ==> 475 grams to be used to make the soap, the other 5% ==> 500 grams x .05 = 25 grams of oil will be floating around in your bar of soap and is considered the superfat. So at 5% superfat the amount of lye you put in is just enough to soaponify 95% of your oils. Likewise at 10% superfat you only put enough lye in to soaponify 90% of your oils.
Now you make this recipe and you forgot the CASTOR...but your at 5% superfat so you used 143 grams of lye
Now your "unintended" recipe is:
35% coconut oil 350 grams (sap values .183 with 0% super fat)
60% Sunflower 600 grams (sap value .135 with 0% superfat)
Lye required = 350x.183 + 600x.135
= 64.05 + 81
= 145.05 grams of lye <== for 0% superfat
You used 143 grams of lye..... which means you are OK .... that is you could have used up to 145.05 grams of lye and expected all the lye to be used up (no crystals - crystals happen when all the lye is not used up... or your don't mix well, and all the lye is not used up)... you have a 2.5 gram buffer. You should be fine. Clearly if you used more than 145.05 grams of lye you might have issues. I say might because even withing sunflower oils, they are not all created equal and the TRUE SAP value for one sunflower oil might be .1357 while another might be .1341 ... that is the SAP values provided are not for a particular SUNFLOWER oil manufacture and the SAP value can still vary between manufacturers. Soapers who want to work at less than say 2% superfat probably need the exact SAP value for the BRAND of oil they are using... not just the type of oil -- they might need a manufacturers SPEC sheet or something.
Best of LUCK !!!
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