Meaning of Longevity

ackemp

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Feb 9, 2020
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Hi guys. Does 'Longevity' in the results section of the soap calculator mean that you won't get so many washes out of each bar, or that the oils will go off sooner? If the latter, will the addition of Rosemary Extract help?
 
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Yooper

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Sep 7, 2019
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Upper Peninsula of Michigan/ Florida Gulf Coast
No, it doesn’t mean it will go off sooner. It means how long the bar will last in normal use, and and is based on the solubility of the soap.
The number comes from Subtracting the cleansing value from the hardness Value.
Some soaps, like pure castile (100% olive oil soaps) will be hard enough to pound nails with after a long cure- but will not last as long in the shower due to its higher solubility.
 

ackemp

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Feb 9, 2020
Messages
3
No, it doesn’t mean it will go off sooner. It means how long the bar will last in normal use, and and is based on the solubility of the soap.
The number comes from Subtracting the cleansing value from the hardness Value.
Some soaps, like pure castile (100% olive oil soaps) will be hard enough to pound nails with after a long cure- but will not last as long in the shower due to its higher solubility.
Thanks for your response. Can anything be added to counteract the lack of longevity?
 

Yooper

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Location
Upper Peninsula of Michigan/ Florida Gulf Coast
Yes- using harder oils/butters will add to the longevity.
Adding beeswax will also help (but not too much- it will get sticky if you add too much).
Adding stearic acid to the batch will also make it harder, meaning it would be longer lasting. That’s commonly used in shaving soap.
Curing the soap longer before first use will mean a longer lasting bar also, since more water would have been evaporated out.
Table salt and sodium lactate would also help. Not much table salt at all- I forget how much is the recommended use, but you’d want the non-iodized small grain table salt.
 

ackemp

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Feb 9, 2020
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Thanks so much for your advice, it's much appreciated. I am trying to create hemp soaps which are also vegan. I've worked out a recipe but the only problem is longevity, so I will now look at the additives you mention above to counteract this shortcoming. Thanks again. Love the website and recipe builder btw :)
 
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