CAS number 1332-58-7
INCI name Kaolin
Kaolin, or white clay, is a gentle skincare ingredient known for its oil-absorbing, cleansing, and exfoliating properties. It helps manage dry skin, prevents acne, and leaves the skin smooth. This fine, odorless powder ranges from white to yellowish-gray, with the chemical formula Al₂O₃·2SiO₂·2H₂O.
Purpose
Kaolin clay is a natural opacifier, commonly used in cosmetics to reduce transparency and create a matte, opaque appearance in formulations. While it does not have inherent preservative properties, it is chemically inert and does not support microbial growth, though water-based formulations containing kaolin may still require preservatives. Known for its soothing properties, kaolin gently calms irritation, reduces redness, and provides a mild cooling effect, making it ideal for sensitive skin and skincare applications.
Origin
Kaolin is a naturally occurring ingredient derived from the mineral kaolinite, first mined in the Kaoling hill, which inspired its name. Although kaolinite itself is white, the presence of other minerals gives kaolin clay a color range from white to yellowish.
| Feature | Description |
| Name | Kaolin clay |
| Type | Hydrated aluminum silicate |
| Source | Naturally occurring in soil, derived from feldspar-rich rocks through weathering |
| PH | 4.6 |
| Color | White to light beige (can vary with impurities) |
| Odor | Odorless |
| Concentration | 1-60% |
| Physical state | Soft, fluffy, lightweight powder |
| Melting point | 1750°C |
| Solubility | Insoluble in water |
Gentle and Non-Irritating Nature
Kaolin clay is one of the mildest clays available, making it suitable for all skin types, including sensitive and dry skin. Unlike other clays like bentonite, which can be highly absorbent and potentially drying, kaolin has a balanced absorption capacity that removes excess oil without stripping natural moisture.
Fine Particle Size and Soft Texture
The extremely fine particle size of kaolin contributes to its soft, silky texture, making it ideal for cosmetic applications such as face powders, setting powders, and mineral foundations. This fine consistency allows for smooth blending and even application on the skin without a chalky feel.
Natural Opacifying Agent
Kaolin is a natural opacifier, meaning it can reduce transparency in formulations and create a more opaque, uniform appearance. This makes it valuable in cosmetics like foundations, BB creams, and sunscreens, where a matte, non-glossy finish is desired.
Mild Absorbency with Balancing Properties
Unlike more aggressive clays that can over-dry the skin, kaolin absorbs excess sebum gently, making it suitable for both oily and combination skin. It helps regulate oil production without disrupting the skin’s natural barrier, keeping it balanced and healthy.
Soothing and Anti-Inflammatory Effects
Rich in minerals like silica, kaolin has natural skin-soothing properties. It helps calm irritation, reduce redness, and provide relief for sensitive or inflamed skin. This makes it beneficial for people with conditions like rosacea, eczema, or acne-prone skin.
High Stability and Inert Nature
Kaolin is chemically stable and does not react with other ingredients in formulations. Its inert nature makes it ideal for a wide range of applications, including cosmetics, skincare, pharmaceuticals, and even industrial uses such as ceramics and paint production.
Non-Swelling and Non-Gelling Properties
Unlike clays like bentonite, which swell when mixed with water, kaolin maintains its structure and does not form a gel-like consistency. This makes it easier to incorporate into formulas without affecting viscosity or texture.
Natural Detoxifying and Cleansing Ability
Kaolin has a gentle detoxifying effect, as it binds to impurities and toxins on the skin’s surface, drawing them out without disrupting the skin’s pH balance. It is commonly used in detox masks, exfoliating cleansers, and purifying treatments.
Heat and Chemical Resistance
Kaolin clay is highly heat-resistant and does not break down under high temperatures. This property makes it useful in industrial applications such as ceramics, refractory materials, and coatings for heat-resistant surfaces.
Safe and Environmentally Friendly
As a naturally occurring mineral, kaolin is eco-friendly and biodegradable. It does not pose harm to the environment, and its non-toxic nature makes it safe for topical use, even on delicate skin. Additionally, it is free from synthetic additives and does not require chemical processing, making it a sustainable choice in skincare and cosmetic formulations.
Applications of Kaolin Clay in Skincare and Haircare
Skincare Applications
- Cleansers & Face Washes: Kaolin is used in facial cleansers to remove dirt, oil, and impurities without stripping moisture, making it ideal for sensitive and acne-prone skin.
- Face Masks & Detox Treatments: Its gentle absorbent properties help detoxify the skin by pulling out toxins and excess oil while soothing inflammation.
- Exfoliators & Scrubs: Kaolin’s fine particle size makes it an effective yet mild exfoliant, removing dead skin cells for a brighter complexion.
- Mattifying Powders & Foundations: Due to its oil-absorbing and opacifying properties, kaolin is commonly used in setting powders and mineral foundations to control shine and improve texture.
- Soothing Creams & Lotions: Its anti-inflammatory nature helps calm irritation, making it a popular ingredient in skincare products for sensitive or redness-prone skin.
- Acne Treatments: Kaolin absorbs excess sebum, reducing breakouts and controlling shine without over-drying, making it a key ingredient in acne-fighting products.
- Body Powders & Deodorants: The clay’s natural absorbency helps keep the skin dry, reducing sweat and odor in body care formulations.
Haircare Applications
- Dry Shampoos: Kaolin is a lightweight oil-absorbing agent, making it an excellent ingredient in dry shampoos to refresh hair between washes.
- Scalp Treatments & Detox Masks: It helps remove excess oil, product buildup, and impurities from the scalp without causing irritation.
- Volumizing Hair Powders: Kaolin adds texture and volume to hair, making it a common ingredient in styling powders for a fuller appearance.
- Shampoos & Conditioners: Used in mild hair cleansers, it helps cleanse the scalp without stripping natural oils, making it suitable for sensitive scalps.
- Anti-Dandruff Treatments: Its soothing properties help calm an irritated scalp and reduce flakiness associated with dandruff.