How To Make Potassium Hydroxide Lye Flakes

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If you are into soap making, you may have come across the term “lye flakes”. Lye flakes are a key ingredient in soap making, and one of the most popular types is potassium hydroxide (KOH) lye flakes. In this article, we will discuss how to make potassium hydroxide lye flakes in detail.

What is Potassium Hydroxide Lye?

Potassium hydroxide lye is an alkaline substance used in soap making to convert oils and fats into soap. Unlike sodium hydroxide lye, potassium hydroxide lye is used to make liquid soap, cream soap, and other specialty soap types. It is also commonly used in the food industry and as a cleaning agent.

Ingredients Needed

To make potassium hydroxide lye flakes, you will need the following ingredients:

  • 2 pounds of potassium hydroxide
  • 5 gallons of distilled water
  • A large stainless-steel pot
  • A scale
  • Gloves and goggles for safety

Step-by-Step Instructions

Follow these steps to make potassium hydroxide lye flakes:

  1. Weigh out 2 pounds of potassium hydroxide on your scale.
  2. Add the potassium hydroxide to 5 gallons of distilled water in your large stainless-steel pot.
  3. Stir the mixture until the potassium hydroxide dissolves completely.
  4. Place the pot on a stove and heat the mixture on low heat.
  5. Allow the mixture to simmer for 3-4 hours, stirring occasionally.
  6. After 3-4 hours, the mixture will start to thicken and turn into a paste-like consistency.
  7. Continue to simmer the mixture until it becomes a thick, white paste with a consistency similar to mashed potatoes.
  8. Turn off the heat and allow the mixture to cool to room temperature.
  9. Once the mixture has cooled, use a spoon to break up the paste into small flakes.
  10. Store the flakes in an airtight container in a cool, dry place.


It is important to take proper safety precautions when making potassium hydroxide lye flakes. Always wear gloves and goggles to protect your skin and eyes from the mixture. Work in a well-ventilated area to avoid inhaling any fumes. Keep the mixture away from children and pets.


Making your own potassium hydroxide lye flakes can be a fun and rewarding experience for soap makers. By following the steps outlined in this article, you can create your own high-quality lye flakes for your soap making projects. Remember to always take proper safety precautions and store the flakes in a cool, dry place.