Why use Propylene Glycol instead of Alcohol when making M&P Soap

Traditionally alcohol has been used as the solvent in making M&P soap. It works well and help produce a transparent bar, but it does some have some drawbacks. Many people have used Proplyene Glycol  (PG) in place of alcohol with great results. Below  a list of reasons why I prefer PG over alcohol

  • The price - Alcohol can be 4X as expensive as PG.
  • Alcohol (Enthanol) boils at 173.1°F; PG boils at 370.8°F
  • Alcohol like water will evaporate from the finished soap causing more shrinkage
  • Alcohol is restricted in many areas making is difficult to obtain.
  • You may need a special permit to purchase large quantities for soap making
  • You can purchase Specially Denature Alcohol (SDA) but these are also very expensive compared to PG
  • PG allows the soap to be re-meltable
  • And Finally - I prefer my Alcohol in a cocktail, not my soap

The instructions for making your own M&P soap from scratch are in the forums. Click here to register.



  1. Pams on April 26, 2018 at 11:01 AM

    Thank you now I know it is remelt-able. Good luck at the conference and have fun!.

    Question where do you get the molds used in the photo of the three flowers?


    • Dr John on April 26, 2018 at 11:09 AM

      The molds are Milky Way Molds. I bought them from Wholesale Supply Plus.

  2. DiamondEyes on May 16, 2018 at 6:31 AM

    Questions: Can other oils be used? What’s the criteria?

    • Dr John on May 16, 2018 at 8:28 AM

      Yes you can use other oils. You do need a large percentage of hard oils (Saturated). If you use a large percentage of soft oils the soap will still set up, but it will be rubbery. Using SoapCalc a hardness of around 40 will work well. You can go higher but you may find the soap drying. though you can always superfat.

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