Rate My SPF

Isododecane

What Isododecane is & what it does

A very light, fast-evaporating emollient that leaves a weightless, dry feel and improves the wear of long-lasting and water-resistant formulas. It spreads filters thinly and evenly.

What is Isododecane and what does it do in sunscreen?

Isododecane is a very light, fast-evaporating emollient. In sunscreen it spreads the filters thinly and evenly, then flashes off to leave a weightless, dry feel, which also improves the wear of long-lasting and water-resistant formulas. It is a big reason many modern sunscreens feel light rather than greasy.

Is Isododecane safe?

Yes. Isododecane is a highly purified, well-tolerated cosmetic emollient that has a long track record in makeup and sunscreen. It is generally non-irritating and non-sensitizing for most people. Because it largely evaporates, it leaves little behind on the skin.

Does Isododecane clog pores?

Generally no. Isododecane is a light, volatile emollient that mostly evaporates rather than sitting on the skin, so it is considered low risk for clogging pores. It is often chosen precisely to keep a formula feeling weightless. Heavier oils and waxes in a product are far more likely culprits for breakouts.

Is Isododecane natural or synthetic?

It is synthetic. Isododecane is a purified, lab-made hydrocarbon refined to be light and consistent, which is what makes it evaporate cleanly and spread filters evenly. That synthetic origin is not a safety concern; it is simply how a stable, predictable emollient is produced.

Why is Isododecane used in long-wear and water-resistant sunscreens?

Because it evaporates quickly and leaves a thin, even film, isododecane helps filters set down in a uniform layer that resists transfer and water. That improves how long the protection stays put and keeps the finish dry and light. This is why it shows up often in sport, spray, and long-wear formulas.

Sunscreens with Isododecane

We rate 624 sunscreens that contain it, showing the top 10 by overall score:

← All ingredients