Spf

Polysilicone-15

Parsol SLX — a unique UVB filter based on a silicone polymer. It does not penetrate the skin due to its large polymer molecule, providing water resistance and a silky texture at the same time. Especially recommended for children and sensitive skin.

Parsol SLXUVB filterdoes not penetratewater-resistant

✓ Safe

Comedogenic Rating

0/5

Irritation Potential

0/5

What is it?

Polysilicone-15 — a polydimethylsiloxane polymer, to which cinnamate chromophores (absorbing UVB) are covalently attached to the side groups. Trade name Parsol SLX (DSM Nutritional Products). Peak absorption ~312 nm (UVB). Due to its very high molecular weight (~5000–10000 Da), it does not penetrate the stratum corneum. Maximum concentration in the EU: 10%. The silicone backbone provides excellent cosmetic properties and water resistance.

Sunscreens for children and sensitive skin, water-resistant sports sunscreens, products where the systemic safety of the filter is a priority.

Key Benefits

✦

Does not penetrate the skin — maximum systemic safety

The high molecular weight of Polysilicone-15 (polymer) excludes penetration through the stratum corneum and entry into the bloodstream. Studies confirm the absence in blood plasma even with prolonged daily use. This is especially important for children's sunscreens, where the safety of the filter is a priority. No monomeric organic filter can guarantee such a level of safety.

◈

Water resistance and duration of protection

The silicone polymer base provides excellent water resistance: Polysilicone-15 is not washed off during bathing and is not expelled by sweat. Formulas with Parsol SLX meet the water-resistant requirements of 40/80 min labeling without additional water-resistant additives. Ideal for active sports and beach sunscreens.

✧

Silky texture — silicone profile

The polysilicone backbone of the molecule gives the formulas a characteristic silky texture without greasiness. It blends well with other silicones (dimethicone, cyclopentasiloxane) and esters. It does not leave a white residue and distributes evenly. Often used in lightweight daily sunscreens for urban use.

Suitable for

children's skinsensitive skinall skin types

Main Actions

✓ UVB protection✓ absence of systemic absorption✓ water resistance

Macromolecular filters — the future of sunscreens?

The discussion about the systemic safety of chemical filters (FDA study 2019: avobenzone and others in the blood after 4 days of use) stimulates interest in macromolecular filters. Polysilicone-15 and Tinosorb M — two major representatives. Both effectively absorb UV and do not penetrate the skin. The direction of new filter development for the next decade.

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