What Is C18-70 Isoparaffin?
C18-70 Isoparaffin is a group of branched alkanes whose carbon chain lengths run from 18 to 70 atoms. These hydrocarbon molecules come from highly purified fractions of petroleum or plant-derived paraffinic waxes that have been distilled and refined to remove impurities, scent and color. First introduced to cosmetics in the late 1970s, it offered formulators a lightweight alternative to heavier mineral oils. Through controlled hydrogenation and isomerization, manufacturers create a clear, odorless fluid that is stable, non-reactive and friendly to a wide pH range. Thanks to this consistency, C18-70 Isoparaffin appears in moisturizers, face masks, anti-aging creams, makeup removers, hair serums and soothing after-sun gels.
C18-70 Isoparaffin’s Cosmetic Benefits/Uses
This ingredient brings several helpful roles to personal care products:
- Skin conditioning: It leaves a smooth, soft feel on the skin which boosts the sensory appeal of lotions and creams
- Emollient: By filling in tiny gaps between skin cells it helps trap water, easing dryness and improving overall suppleness
- Skin protecting: It forms a light, breathable film that shields skin against wind, cold and everyday pollutants without feeling greasy
Who Can Use C18-70 Isoparaffin
C18-70 Isoparaffin suits most skin types. Dry, normal and combination skin tend to appreciate its light occlusive film that locks in moisture without heavy residue. Sensitive skin usually tolerates it because the ingredient is chemically inert and free of fragrance. Very oily or acne-prone users can also try it, though any occlusive agent can sometimes feel too rich for skins that overproduce sebum.
The ingredient itself is petrochemical or plant wax derived, contains no animal components and is therefore appropriate for vegans and vegetarians. That said, people who avoid all petroleum sources for personal or environmental reasons may wish to verify the origin with the brand.
C18-70 Isoparaffin is not linked to endocrine disruption or systemic absorption, so products containing it are generally considered safe during pregnancy or while breastfeeding. This is not medical advice and pregnant or nursing women should still clear any skincare routine with their doctor to be safe.
The molecule does not cause photosensitivity, so daytime use does not raise the risk of sunburn. It is also fragrance free and compatible with common actives like retinoids or vitamin C, making it a flexible option in layered routines.
Potential Side Effects/Adverse Reactions
Reactions to topical C18-70 Isoparaffin differ from person to person. The effects below are possible yet unlikely for most users when the ingredient is properly formulated.
- Transient skin irritation such as mild redness or stinging
- Comedogenic flare-ups in individuals extremely prone to clogged pores
- Greasy or heavy skin feel if applied in excess
- Very rare allergic contact dermatitis
- Occlusion that can enhance the penetration of other irritants trapped underneath the film
If any discomfort or unexpected reaction occurs stop use immediately and consult a healthcare professional or dermatologist.
Comedogenic Rating
Rating: 1 out of 5. C18-70 Isoparaffin molecules are large, highly refined hydrocarbons that sit mostly on the surface of skin and do not readily mix with sebum in the pore. Their lightweight film is far less likely to block follicles than heavy plant butters or waxes, yet the occlusive nature still poses a small chance of trapping debris for those who clog easily. In practical use most people, even many with combination skin, tolerate it without new breakouts.
Suitable for acne-prone or breakout-prone skin in most cases, though extremely reactive users may still prefer to avoid any occlusive ingredients.
Formulas that pair C18-70 Isoparaffin with highly comedogenic oils or heavy silicones could raise the overall clogging risk, so looking at the whole ingredient list matters.
Summary
C18-70 Isoparaffin works as a skin-conditioning emollient and a light protective agent. By filling microscopic gaps between cells it smooths texture and reduces water loss, while its inert film helps shield skin from wind and pollutants. This balance of slip and breathable occlusion lets formulators create moisturizers, masks, makeup removers and hair products that feel silky rather than greasy.
The ingredient has never reached the household-name status of glycerin or jojoba oil, yet it appears quietly in a wide range of mainstream and professional products because it is inexpensive, stable and easy to formulate.
Current safety reviews rate C18-70 Isoparaffin as low risk for irritation, sensitization or systemic absorption, including during pregnancy or breastfeeding. Still, skin can react unpredictably so it is wise to patch test any new product and discontinue use if redness or bumps appear.