Isopropyl myristate is rarely chosen in isolation – it is chosen against isopropyl palmitate, a triglyceride, a silicone or a mineral oil, and the decision is almost always about skin feel and spreading rather than about purity. This page is that comparison, in the form a formulator uses it: what each ester does to the feel, how it spreads, what it costs, and where substituting one for another changes the product rather than the price.
The comparison table
| Emollient |
Skin feel |
Spreading |
Polarity |
Relative cost |
Typical role |
| Isopropyl myristate (C14 ester) |
Light, dry, slightly silky |
Good |
Low |
Low |
General emollient, spreading agent, sun care solvent |
| Isopropyl palmitate (C16 ester) |
Richer, slightly heavier |
Moderate |
Low |
Low |
Where more body and occlusion are wanted |
| Isopropyl isostearate (branched C18) |
Very light, elegant |
Excellent |
Low |
Higher |
Premium skin feel, easy-spreading emulsions |
| Caprylic/capric triglyceride |
Dry, smooth, neutral |
Good |
Low-moderate |
Moderate |
Vegetable-derived alternative to mineral oil |
| Dimethicone |
Slippery, non-greasy, protective |
Very good |
Very low |
Moderate |
Slip, film formation, scar and barrier products |
| Mineral oil |
Heavy, occlusive, greasy |
Poor |
Very low |
Very low |
Occlusion at minimum cost |
| Vegetable oils (sunflower, jojoba) |
Rich, variable |
Poor to moderate |
Low-moderate |
Moderate to high |
Natural positioning, skin affinity |
| Lanolin |
Heavy, sticky, very occlusive |
Poor |
Moderate |
Moderate |
Intensive repair, cracked skin |
What actually changes when you substitute
| Substitution |
What changes in the product |
What to re-test |
| IPM to isopropyl palmitate |
Richer feel, slower spreading, slightly more occlusion |
Skin-feel panel; spreadability of a sunscreen; the emulsifier balance |
| IPM to isopropyl isostearate |
Lighter and more elegant, faster spreading |
Whether the product now feels too thin; cost per batch |
| IPM to caprylic/capric triglyceride |
Slightly less spreading, more neutral feel, natural-derived story |
Solubility of UV filters or actives; stability |
| IPM to dimethicone |
Much greater slip, film formation, less skin affinity |
Reapplication behaviour; interaction with other silicones; foam in emulsions |
| IPM to mineral oil |
Heavier, more occlusive, greasier, cheaper |
Consumer sensory; acne-prone positioning; spreading of the finished product |
| IPM to a vegetable oil |
Rich and variable, natural marketing, poorer oxidation stability |
Shelf life and rancidity; batch-to-batch colour |
The properties that drive the choice
| Property |
Why it matters |
How IPM sits |
| Molecular size and polarity |
Small, low-polarity esters penetrate the stratum corneum and spread easily; large or polar oils sit on the surface |
Small and non-polar – it penetrates and spreads rather than occluding |
| Saturation |
Unsaturated oils oxidise and turn rancid; saturated esters are stable but can still hydrolyse |
Fully saturated, good oxidative stability, acid value is the parameter to watch |
| Solubility parameter |
Determines which actives and UV filters dissolve, and whether the oil phase stays clear |
Good solvent for many organic UV filters and oil-soluble actives |
| Surface tension and viscosity |
Set how fast a film spreads over skin |
Low viscosity relative to triglycerides, which is where the spreading comes from |
| Occlusivity |
Controls transepidermal water loss reduction |
Low – IPM is an emollient, not an occlusive; pair it with a heavier oil where barrier repair is the claim |
Blending, not single-ingredient thinking
Most real formulations use two or three emollients rather than one, because skin feel is a curve, not a point. A common pattern pairs IPM (spreading and light) with a heavier ester or a triglyceride (body) and a silicone (slip), so the product spreads easily but still feels substantial.
| Formulation goal |
Reasonable blend |
Why |
| Light lotion for oily skin |
IPM with a small amount of dimethicone |
Spreads well, dries down, no greasy residue |
| Rich cream for dry skin |
IPM plus caprylic/capric triglyceride or shea-based ester |
Spreading from IPM, occlusion and body from the heavier component |
| Sunscreen |
IPM as the filter solvent plus a light silicone |
Dissolves the filters and gives an even, non-tacky film |
| Body oil |
IPM with a vegetable oil |
Improved spread and reduced greasiness, with a natural-oil story |
| Lipstick / pressed powder |
IPM as binder with a wax and a heavier ester |
Flow and pigment wetting, with structure from the wax |
Where IPM is the wrong choice
| Situation |
Why it fails |
Better option |
| Barrier repair and very dry skin |
Low occlusivity – it softens but does not stop water loss |
Petrolatum, lanolin, shea butter or a heavier ester |
| Certified natural or organic products |
Synthetic ester, even when the fatty acid is vegetable-derived |
Vegetable oils or certified natural esters, depending on the standard |
| High-solids suspensions |
Low viscosity can allow settling |
A structured oil phase or a rheology modifier |
| Products where tackiness is unacceptable |
At high loading it can feel oily or slightly tacky |
Isopropyl isostearate or a light silicone |
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