How soluble is this peppermint oil in different media?
Peppermint oil is a mobile, monoterpene-rich liquid that dissolves readily in ethanol and fixed oils and is practically insoluble in water. The official solubility test in ISO 856 is 1 part of oil in 3 parts of 70% ethanol, giving a clear solution.
Solubility Profile
| Medium | Solubility | Notes |
|---|---|---|
| Water | Insoluble | Separates cleanly (oil floats, being lighter); use a solubiliser for clear aqueous products |
| Ethanol (70%) | Fully soluble (1:3, clear) | Official test per ISO 856:2006 |
| Ethanol (95% / anhydrous) | Fully soluble | Standard for oral-care flavours and fine fragrance |
| Fixed oils | Fully soluble | Direct blending for massage and body-care bases |
| Propylene glycol | Fully soluble | Common in mouthwashes and flavouring systems |
| Glycerin | Poorly soluble | Avoid for clear aqueous systems without solubiliser |
Practical Notes
- Because the oil is lighter than water (0.900-0.916), any water layer sits below the oil — easy visual separation check
- For clear water-based products (mouthwash, room spray), pre-dissolve the oil in polysorbate (Tween) or ethanol before adding to water
- In confectionery and oral-care flavours, propylene glycol or ethanol pre-dilution is standard practice
- A 1:3 dilution in 70% ethanol turning cloudy indicates possible contamination with a heavier oil or waxes
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