Home Cosmetic Science Talk Formulating General Off Topic Grams, cups, oz, parts

  • OldPerry

    May 18, 2020 at 10:54 pm

    Well, assuming that they are using the terms consistently, a part just refers to an equivalent amount. Specifically, when talking about a liquid I would think it is a volume measurement.

    So, if you have 1 part lavender oil and 1 part lemon oil, you would figure it out like this.

    1.  Add up all the parts.  (1+1=2)
    2.  Figure out the % by dividing parts by the whole.

      Lemon oil = 1/2 = 50%
      Lavendar oil = 1/2 = 50%

    The % should equal 100%

    If, for example, it was 3 parts lavender oil and 1 part lemon oil the calculation would be this

    1+3 = 4 total

    Lavender oil = 3/4 = 75%
    Lemon oil  = 1/4 = 25%

    Formulating should be done in % and all the measurements should be made in mass (grams).  Cups, ounces, parts shouldn’t be used.

  • Olivia_76

    May 18, 2020 at 10:59 pm

    Thanks, that makes sense to me now. a-ha moment :) 

  • Pharma

    May 19, 2020 at 6:24 am

    With fragrances, parts may actually be a ‘valid’ measure. Regarding scent profile, relative amounts of the different EO matter. Total amount simply imparts more or less scent to the final product and that is up to the manufacturer’s likings.

  • Olivia_76

    May 19, 2020 at 8:53 am

    Thanks ???? 

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