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Menthol/Methyl salicylate
Hello,
Does anyone knows in what phase I have to pre mix (oil or water) menthol (1 %) and methyl salicylate (7.5 %)?
Thank you.
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12 Replies
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I am working in a very similar project. We should join forces!
Menthol should be dissolved in alcohol, and this solution should be added after the cream is formulated and is almost cooled. While methyl salicylate can be added in the old phase. -
Thank you @em88 for your response. I am at the beginning yet and I am looking for formulas.
Some formulas said that you said me. Some others said to dissolve menthol in oil, without the use of alcohol.
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Dissolve Menthol in Oil and add to the formulation at 50C or less. Menthyl Salicylate can be added at the same time as the Menthol
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Interesting, I didn’t know it would dissolve in the oil phase. Is this possible even if the menthol crystals are bigger?
Is there any specific ratio? -
Yes, Menthol is oil-soluble … you may apply some heat to facilitate it dissolving …
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Thank you. I will try this out.
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Thank you both @em88 and @MarkBroussard for the useful advices!
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Tested and I can confirmed, menthol dissolves very easy in the oil phase especially in a higher temperature! Very nice!
Since we are in the topic, I have an other question.
When I add all these substances in the oil phase (especially methyl salicylate is around 15%) will increase the quantity of the oil phase and based on my tests, the final cream does not have a high viscosity (I had to add HEC to solve this issue) and I tend to believe the stability is not the best. Should I decrease the oil phase and add up more water (and hec) so the oil phase will be emulsified better? I’m going to test this tomorrow anyway. Thank you
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@em88 what else do you have in the oil phase?
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I have cetearyl alcohol 15%, petrolatum 10%, paraffin oil 4% and tween 80/span 80 4% for hlb around 12
In the oil phase I also add propylene glycol 5% which I’m thinking to remove it.
Water phase is only 40% water and 0.75% hec -
if you want higher viscosity you’d be best off changing your emulsifier system, since Tween 80 and Span 80 are both liquids at room temperature: try using Tween 60 and Span 60 instead
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Unfortunately we do not work with tween 60 and span 60, but that indeed is a good idea.
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