What Is C7-8 Isoparaffin?
C7-8 Isoparaffin is a mix of lightweight branched hydrocarbons that contain seven or eight carbon atoms. These molecules come from petroleum that has been highly refined to remove impurities, odor and color. The result is a clear, odorless liquid that evaporates quickly and feels dry to the touch.
The cosmetic world started looking at isoparaffins in the mid-20th century when formulators wanted safer, less greasy alternatives to mineral oil. As refining methods improved, suppliers were able to create narrow cuts like C7-8, giving chemists a tool that behaves in a very consistent way from batch to batch.
Production begins with crude oil. After distillation, the lighter fractions are treated with hydrogen, then isomerized to create the branched (iso) structure. A final purification step filters out anything that could irritate skin. Because the process removes nearly all aromatic compounds, the finished ingredient is considered low risk for sensitization.
You will most often see C7-8 Isoparaffin in sprayable products such as body mists, deodorants and hair shine sprays where a fast-drying feel is key. It also shows up in lightweight primers, thin serums, sheet mask essences and some water-resistant sunscreens where it helps form an even, flexible film.
C7-8 Isoparaffin’s Cosmetic Benefits/Uses
Formulators choose this ingredient for two main reasons, each offering its own set of perks.
- Solvent: Helps dissolve fragrance oils, sunscreen filters and other actives so they spread evenly on skin or hair. By flashing off after application it leaves behind the beneficial ingredients without a greasy after-feel.
- Viscosity controlling: Thins heavy formulas making sprays mist smoothly, serums glide easily and lotions feel lighter. This control lets brands fine-tune texture without using extra water or alcohol.
Who Can Use C7-8 Isoparaffin
This ultra light solvent works for most skin types. Oily and combination complexions appreciate its dry finish that disappears without a trace while normal and even sensitive skin usually tolerate it thanks to its highly refined, low residue makeup. Very dry skin may find it offers no moisture of its own so pairing it with richer emollients is advised.
C7-8 Isoparaffin comes from petroleum, not animals, so it fits vegan and vegetarian lifestyles. It is also free of common animal-derived processing aids.
The ingredient is regarded as low risk for pregnant or breastfeeding women because it sits on the surface and evaporates quickly, limiting systemic exposure. This is not medical advice; anyone who is expecting or nursing should confirm product choices with a healthcare professional.
It does not make skin more sensitive to sunlight and has no known interactions with UV exposure.
Potential Side Effects/Adverse Reactions
Responses to any cosmetic ingredient can differ from one person to another. The points below outline possible issues but most users will never experience them when the product is formulated and used as intended.
- Mild skin irritation: A small number of users may notice redness or a stinging sensation, particularly on already compromised skin
- Contact dermatitis: Extremely rare allergic reactions can lead to itching rash or swelling
- Dryness or tightness: Fast evaporation can leave some skin feeling parched if the formula lacks compensating moisturizers
- Eye irritation: Sprays containing the ingredient may cause temporary burning or watering if they drift into the eyes
- Enhanced penetration of other actives: As a solvent it can help drive certain ingredients deeper which may amplify irritation from those actives
If any discomfort or adverse change occurs stop using the product and consult a qualified medical professional
Comedogenic Rating
Rating: 1 / 5
C7-8 Isoparaffin is a very light fast-evaporating solvent that does not sit on the skin long enough to block pores. Its branched structure leaves only a whisper of residue and the high level of purification removes almost all pore-clogging impurities.
A score of 1 means most people prone to acne or breakouts can use it without worry.
Because it flashes off quickly it is often blended with other ingredients that do stay behind. If you are highly clog-prone scan the whole label to be sure those companions are also low on the scale.
Summary
C7-8 Isoparaffin works as a solvent and a viscosity controller. It dissolves fragrance oils, UV filters and other actives so they spread evenly then evaporates to leave them in place. It also thins heavy bases so sprays mist finely, serums glide easily and lotions feel lighter.
While not a headline ingredient it is quietly popular in products that need a dry fast finish like body mists, deodorants and water-resistant sunscreens.
Studies and decades of use show it is generally safe and non-sensitising. Still skin can be unpredictable so do a small patch test whenever you try a new formula that contains it just to be safe.