Description
Lye (Sodium Hydroxide – NaOH)
What is Lye?
Lye, chemically known as Sodium Hydroxide (NaOH), is a highly caustic alkaline compound essential for traditional soap making through a process called saponification. When combined with fats or oils, lye chemically reacts to produce soap and glycerin.
Uses in Handmade Products:
-
Cold Process Soap Making: Lye is mixed with water and oils/fats to create solid soap bars.
-
Hot Process Soap Making: Used similarly but with heat applied to speed saponification.
-
Cleaning & Industrial Applications: Outside cosmetics, lye is also used in drain cleaners and degreasers (not for skin contact).
Important Safety Notes:
-
Lye is highly caustic and corrosive; it can cause severe chemical burns.
-
Always wear protective gear (gloves, goggles, long sleeves) when handling.
-
Work in a well-ventilated area.
-
Never add water to lye—always add lye slowly to water to prevent dangerous splashes and heat buildup.
Usage Rates in Soap Making:
-
The amount of lye required depends on the type and amount of oils/fats used and the desired soap properties.
-
Soap calculators (like SoapCalc or BrambleBerry’s lye calculator) help determine exact lye quantities based on oils selected.
-
Lye concentration in the water solution typically ranges from 25% to 33% (lye weight relative to water weight).
-
Properly calculated lye ensures complete saponification with no leftover lye in the final soap product.
Handling & Storage:
-
Store in a tightly sealed container in a cool, dry place away from moisture and acids.
-
Keep out of reach of children and pets.
-
Lye absorbs moisture and carbon dioxide from the air, so exposure reduces its effectiveness over time.
Common Measurements:
UseLye SolutionCold Process Soap25-33% lye in waterHot Process SoapSimilar to cold process, sometimes slightly stronger
Summary:
Lye is an indispensable ingredient in handmade soap making but must be handled with respect and caution due to its caustic nature. Accurate measurement and safety protocols are essential for a successful and safe soap-making process.
