What Is Polysilicone-13?
Polysilicone-13 is a specialty silicone made by linking small silicone units with a polyethylene–polypropylene glycol backbone. The result is a smooth, flexible polymer that spreads easily on hair and skin. First explored in the late 1990s as chemists searched for lightweight silicones that rinsed clean, it soon found favor in hair care labs thanks to its soft feel and ability to resist humidity. Production starts with hydrogen-terminated dimethylsiloxane. Through a controlled reaction called hydrosilylation, scientists attach polyether chains to the silicone backbone, creating a water-friendly yet waterproof structure. This balance lets the ingredient glide on wet strands without feeling greasy. You will most often see Polysilicone-13 in rinse-off conditioners, leave-in creams, hair masks, color-protection treatments, anti-frizz sprays and some styling products that promise softness and shine.
Polysilicone-13’s Cosmetic Benefits/Uses
Polysilicone-13 serves one key role in beauty formulas: Hair conditioning. When blended into a product, it forms a thin, invisible film over each strand. This film smooths the cuticle so hair feels silkier, tangles less and reflects light better for added gloss. Because the polymer resists water, the conditioning effect lasts through humidity and helps keep styles in place while reducing frizz. Its gentle nature makes it suitable for daily use and for all hair types, from fine to coily.
Who Can Use Polysilicone-13
Polysilicone-13 is considered gentle enough for all skin and scalp types, including sensitive or easily irritated skin, because it is chemically inert and does not penetrate deeply. Oily or acne-prone users usually tolerate it well since the polymer sits on the surface and has a very low likelihood of clogging pores. Dry or damaged hair in particular can benefit from its smoothing film, yet fine hair will not feel weighed down due to the ingredient’s lightweight nature.
The polymer is produced synthetically from mineral-based raw materials, not animals, so it is suitable for vegans and vegetarians. Some brands may also certify that no animal testing was carried out during development.
No studies suggest that Polysilicone-13 poses a risk to pregnant or breastfeeding women when used topically in cosmetics. This is not medical advice, and anyone who is pregnant or nursing should consult a healthcare professional before adding new products to a personal care routine to be on the safe side.
Polysilicone-13 does not make skin or hair more sensitive to sunlight, and it is stable under UV exposure. It can safely be used in daytime products without increasing the need for sun protection.
Potential Side Effects/Adverse Reactions
Reactions to topical Polysilicone-13 differ from person to person. The following list covers possible side effects, but they are uncommon when the ingredient is included at typical cosmetic levels and formulated correctly.
- Mild scalp or skin irritation – usually linked to a sensitivity to the overall formula rather than the silicone itself
- Allergic contact dermatitis – extremely rare but possible for individuals with silicone allergies
- Product buildup on hair – excessive use without proper cleansing can leave a film that dulls shine over time
- Eye irritation – may sting or cause redness if the product accidentally gets into the eyes
- Reduced absorption of leave-on actives – the protective film can slightly hinder penetration of other ingredients applied at the same time
If any discomfort, redness or other adverse reaction occurs, stop using the product immediately and consult a healthcare professional or dermatologist.
Comedogenic Rating
Rating: 1 out of 5. Polysilicone-13 forms a large, inert film that sits on the surface of skin and hair without sinking into pores so it has very little tendency to trap sebum or debris. Its slick texture can even help products glide across the skin instead of tugging, which lowers friction that might lead to clogged pores. It is generally considered suitable for people who are prone to acne or breakouts. Because it is water-resistant, thorough cleansing is recommended to keep buildup from combining with other residues and dulling the skin or hair over time.
Summary
Polysilicone-13 is a lightweight conditioning silicone that coats hair with a smooth, humidity-resistant film. This layer flattens the cuticle for softness, shine and easier detangling while helping styles last longer in damp weather. Though effective, it is still a specialty ingredient so you will mostly find it in higher-end conditioners, leave-ins and anti-frizz sprays rather than in every shampoo on the shelf.
Safety data show the polymer is stable, non-sensitizing and has a very low risk of clogging pores or causing irritation when used at cosmetic levels. As with any new product, perform a quick patch test before full use to confirm personal compatibility.