How do you calculate saponification value of soap?
Divide the amount of lye by 0.3 and then subtract the amount of lye from the result. For example, to make just over 2 pounds of olive oil soap, measure 32 ounces of olive oil and 4.33 ounces of lye because 32 ounces of olive oil × 0.1353, which is the saponification value for olive oil, = 4.33 ounces of lye.
How do you calculate soap recipe?
Calculating the Amount of Soap Needed to Fill a Soap Mold
- Calculate the volume of the mold in cubic inches.
- Multiply the volume of the mold by 0.4 to find the total amount of oils in the recipe.
- Enter that amount of oils into an online lye calculator to get the final recipe quantities.
What is the lye to fat ratio?
Multiply 16 (fat wt) by 0.132 = 2.1 oz. of lye. Why different oils have their own SAP values: It all has to do with the length of the fatty acid chain. Briefly, it takes the same amount of lye to saponify a short fatty acid molecule as it does to saponify a long fatty acid molecule.
What is high saponification value?
The larger the saponification number, the better the soap making ability of the oil. • Higher saponification value for triglyceride indicates higher medium chain fatty acids.
What is the best percentage of lye for soap making?
Most recipes and tutorials here on Modern Soapmaking use a 33% lye solution, as it’s typically a manageable water discount during the soapmaking process, but also hardens up a little quicker to get the soap out of the mold! A strong water discount is typically referred to as a 40% lye solution.
What does a low saponification value mean?
The higher the saponification value, the lower the fatty acids average length, the lighter the mean molecular weight of triglycerides and vice-versa. Practically, fats or oils with high saponification value (such as coconut and palm oil) are more suitable for soap making.
What happens if you put too much lye in soap?
There are two common issues people run into when making soap: not enough lye or too much lye used. Too much lye will result in a bar whose pH is too high and can cause skin irritation and burning. Not enough lye can result in oils going rancid, causing discoloration and bad odors.
What is the best lye concentration in soap making?
How do I know if my soap is lye heavy?
Normal soap pH is around 9-10. If the soap is 9-10 it will turn light green. If the soap is pH 11-14, it is lye heavy. The pH strip will turn a dark green or purple in that case.
What does saponification number indicate?
The saponification value is defined as “the number of milligrams of KOH needed to neutralize the fatty acids obtained by complete hydrolysis of 1gram of an oil sample.”
What does 33% lye concentration mean?
Lye concentration of 33% means there are 33 grams of alkali in 100 grams of lye solution. Water makes up the rest of the 100 grams. In other words, the water weighs 100 – 33 = 67 grams. Lye concentration of 25% means there are 25 grams of alkali in 100 grams of lye solution.