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Oven Hot Process Soap Making Method

Back to Overview

Special Tools

OHP requires one stainless steel pot, large enough to accommodate base oils and lye solution, while leaving at least 1/4 of the pot empty. It is best not to cover the pot with a lid.

How To Proceed

  1. Turn the oven on on the lowest setting (or 100ºC - 212ºF at the maximum) while you prepare ingredients and tools.
  2. Prepare your soap mix as described for Cold Process soap.
  3. When soap is at trace, place the pot in the oven and cook for 10 to 20 minutes, depending on batch size and ingredients.
  4. Turn the oven off and leave the soap pot in (door always shut) for approximately 1 hour.
  5. After this time, take a small amount of soap out of the pot and place it on a saucer for the "ball test" (as described for DBHP).
  6. When the soap is cooked, add the extra ingredients and then proceed as described for DBHP.

From the above description, Oven Hot Process sounds a lot easier than DBHP... but there are some important additional considerations:

  • Mixing temperatures are just as important with OHP as they are with Cold Process soap. Soap mixes that are too hot will volcano out of the pot, with terrible consequences for your oven.
  • The oven temperature must be constantly low, and it's not always easy to reach the ideal cooking point. This depends, but it's not limited to, on how long your oven "stays warm" after being turned off.
  • If the ball test at the end of the cook shows that the soap is not ready yet, you can turn the oven back on for a few minutes, and then leave the soap pot in the oven for 10 to 20 minutes. The only way to work out the ideal cooking times for your soap batches and recipes is to experiment and take notes.
  • When the soap is cooked, essential or fragrance oils and other additives can usually be added straight away (remember, the soap has been sitting in a turned off oven for an hour, so the temperature should already be below 60ºC - 140ºF). In general, OHP soap is more fluid and easier to mould than DBHP.


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last update 24 sep 2011