Quick Answer
Soap seizing during cold process can be caused by high levels of free fatty acids, low temperatures, and incorrect lye concentrations. This can result in a hard, rough, or separated soap that may not lather properly.
Causes of Soap Seizing
Soap seizing during cold process soap making is often due to a combination of factors. High levels of free fatty acids in the oils can cause the soap to seize prematurely, resulting in a hard, rough, or separated soap. To mitigate this, it’s essential to use high-quality oils and to ensure they are within their optimal temperature range for soap making. For example, coconut oil should not be used if it’s below 76°F (24°C).
Temperature Control
Temperature is another critical factor that can cause soap seizing. If the temperature is too low, the soap may not mix properly, leading to a seized or separated soap. Ideally, the temperature should be between 80°F (27°C) and 100°F (38°C) for most soap batches. If the temperature is below 80°F (27°C), it’s best to add a small amount of warm water to the mixture to bring the temperature up.
Lye Concentration
Incorrect lye concentrations can also cause soap seizing. Using too much lye can cause the soap to harden too quickly, resulting in a seized or separated soap. To avoid this, it’s essential to use a lye calculator to ensure the correct amount of lye is used. A general rule of thumb is to use 30% lye concentration for most soap batches. If the lye concentration is too high, it may be necessary to add a small amount of water to the mixture to dilute it.
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