Kaolin: Comedogenic Rating & Ingredient Analysis
Kaolin, or China clay, is a soft white clay and one of the gentlest oil-absorbing ingredients in skincare. Compared with stronger clays like bentonite, kaolin has a milder absorbency, which means it soaks up excess surface oil and gives a clean, mattified finish without pulling as aggressively at the skin's own moisture. This gentleness makes it a favourite for masks and cleansers aimed at sensitive as well as oily skin. It is inert, non-comedogenic and widely used as a base in powders and masks, where it also lends a smooth, silky texture.
Quick facts
- Comedogenic rating
- measured (Fulton 1989)
- Irritation risk
- Low
- Effective pH
- —
- Typical strength
- 5–40%
- Pregnancy
- Considered safe
- Suits skin types
- oilycombinationsensitiveacne-prone
Where this number comes from
Read directly from Table I of Fulton's 1989 paper — the primary source, not one of the copied tables that circulate online.
Fulton read his own scale as 0-1 not significant, 2-3 borderline, 4-5 positive. The assay is the rabbit ear at 10% dilution, which the paper itself calls extremely sensitive and not fully predictive of human skin. Ratings describe the raw ingredient; concentration and formulation change real-world behaviour.
Caution profile
The four published fields on this page, on one 0–5 scale. Further from the centre means more care is needed — never that the ingredient is worse.
Derived, not measured: pore-clogging is the published comedogenic rating; irritation maps low/moderate/high to 1/3/5; pregnancy maps safe/caution/avoid to 0/3/5; skin-type limits is how many of the seven skin types this entry does NOT list. Every input is printed in words in the quick-facts card above.
Show the numbers
| Metric | 0–5 | Published field |
|---|---|---|
| Pore-clogging | 0 | 0/5 |
| Irritation | 1 | Low |
| Skin-type limits | 2.1 | 4/7 |
| Pregnancy | 0 | Considered safe |
Working pH and typical strength
Where this ingredient is formulated to sit, and at what concentration.
Both bars come from the fields above: the pH window and the typical strength range published for this ingredient. The tinted column is healthy skin's surface pH (about 4.7–5.75).
Show the numbers
| Metric | 0–5 |
|---|---|
| Typical strength | 5–40% |
What is it?
Kaolin is a naturally occurring clay made mostly of the mineral kaolinite, a hydrated aluminium silicate. Its fine, plate-like particles can absorb oil and lightly bind debris on the skin's surface, which is why it forms the backbone of many clay masks. Its absorbency is modest relative to more active clays, so it is less likely to leave skin feeling stripped. Because it is chemically inert and sits on the surface rather than penetrating, its role is physical: soaking up sebum, providing gentle mechanical cleansing when rinsed, and giving powders and masks a soft, spreadable feel. It comes in several natural tints, from white to pink and yellow.
Benefits
Gently absorbs oil
Kaolin soaks up excess surface sebum with a milder pull than stronger clays, reducing shine and leaving skin matte without stripping it dry.
Suits sensitive skin
Its gentle absorbency makes kaolin one of the better clay choices for people whose skin is both oily and easily irritated, where a harsher clay would be too much.
Smooths and mattifies
In masks and powders, kaolin gives a soft, silky finish and a temporarily refined, matte look, which is why it appears in many cleansers and setting products.
Inert and non-comedogenic
Kaolin is chemically inert and does not clog pores, so it works as a safe, well-tolerated base ingredient across a wide range of formulas.
How to use
Kaolin is most often used in wash-off masks and cleansers. Apply a kaolin mask to clean skin once or twice a week, leave it for the directed time, and rinse before it fully dries and tightens, then moisturise. Because it is gentle, sensitive and combination skin usually tolerate it well, but even mild clay can over-dry if overused. In a cleanser, use it as a normal face wash. Pair with hydrating products to keep the skin balanced.
Side effects
Kaolin is very well tolerated and rarely causes problems. Its main downside is potential dryness if a mask is used too frequently or left on until it cracks, which can leave skin tight. Any irritation is usually from other ingredients rather than the clay. If your skin feels dry or tight after a mask, reduce how often you use it and focus on hydration.
Who should avoid it
There is little reason to avoid kaolin, and it is often chosen precisely for sensitive skin. Very dry skin should still limit clay masks, since even a gentle clay can accentuate dryness with overuse. If a specific clay product irritates, look to the other ingredients rather than the kaolin itself.
Pairs well with
Frequently asked questions
Is kaolin good for sensitive skin?
Yes. Kaolin is one of the gentlest clays, with milder oil absorption than bentonite, so it suits people whose skin is both oily and easily irritated, provided masks are not overused.
How is kaolin different from bentonite?
Kaolin is a milder, less absorbent clay, while bentonite is stronger and more oil-drawing. Kaolin is gentler and better for sensitive skin; bentonite suits very oily skin that wants a deeper matte effect.
Can kaolin dry out the skin?
It can if a mask is overused or left on until it cracks, since absorbing oil can also affect moisture. Used once or twice a week and rinsed before fully drying, it is gentle for most skin.
Is kaolin safe and non-comedogenic?
Yes. Kaolin is chemically inert and non-comedogenic, so it does not clog pores or irritate on its own, which is why it is used as a base in so many masks and powders.
How often should I use a kaolin mask?
Once or twice a week is enough for most people. Even a gentle clay can over-dry with daily use, so follow each mask with a moisturiser to keep the skin balanced.
Where this ingredient shows up here
Counted across this database, not the web — these are the pages on this site that reason about this ingredient.
Condition pages 5
Sources & further reading
Medical disclaimer
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