How is lye measured in soap?

Divide the amount of lye by 0.3 and then subtract the amount of lye from the result.

1. (Amount of Fat) × (Saponification Value of the Fat) = (Amount of Lye)
2. (Amount of Lye) ÷ 0.3 = (Total Weight of Lye Water Solution)
3. (Total Weight of Lye Water Solution) − (Amount of Lye) = (Amount of Water)

How does a lye calculator work?

To use a lye calculator, you input the oils you want to use, the amount of each oil you plan on using, and you can also specify if you want to superfat the soap or not. (Remember, that means you’ll leave leftover oils that help condition the skin and keep the soap from being too drying.)

How do you calculate lye concentration?

If you would like to create a 33\% solution instead, you would multiply 3.5 ounces x 2 = 7 ounces of water. If you know you need 2 ounces of lye (because your lye is determined by your oils), and want to use a 25\% lye solution, you would simply multiply your lye amount by 3 to find your water amount.

What is lye in soap?

Lye in the form of both sodium hydroxide and potassium hydroxide is used in making soap. “Hot process” soap making also uses lye as the main ingredient. Lye is added to water, cooled for a few minutes and then added to oils and butters.

How do you calculate soap making?

Calculating the Amount of Soap Needed to Fill a Soap Mold

1. Calculate the volume of the mold in cubic inches.
2. Multiply the volume of the mold by 0.4 to find the total amount of oils in the recipe.
3. Enter that amount of oils into an online lye calculator to get the final recipe quantities.

What is lye concentration in soap?

Lye concentration is the grams (or ounces) of alkali contained in 100 grams (or ounces) of lye solution. 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. The water in this solution weighs 100 – 25 = 75 grams.

What should lye concentration be in soap?

We don’t recommend more than 15\% because it can speed up trace too much. Also, the lye may not fully dissolve. That can create lye pockets in the final bars that irritate or burn the skin. Start somewhere between 1-15\%.