Common Name(s): Parsol slx,dimethicodiethylbenzalmalonate

CAS Number: 207732-84-1

DESCRIPTION

What It Does: Provides photostable uvb protection with silicone skin feel and formulation versatility.

Why It's Used: Premium silicone uvb filter combining photostable uv protection with silicone emollient skin conditioning properties.

How It Works: Malonate chromophore on polydimethylsiloxane backbone absorbs uvb (λmax 312nm). photostable from silicone backbone's photochemical inertness preventing chromophore degradation. silicone backbone provides skin conditioning alongside uv protection.

Typically Found In: Premium european sunscreens,silicone-based uv formulations

TECHNICAL DETAILS

Primary Category: Active ingredient – silicone uv filter

Secondary Functions: Skin conditioning

Application Areas:

Typical Concentration Range: Up to 10% (eu)

SOURCING & ETHICS

Vegan Status: Yes – synthetic

Halal Status: Yes

Source Notes: Commercially produced for cosmetic use. verify vegan/halal status with supplier.

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Well-tolerated by most skin types.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Eu approved. not fda approved. ewg score: 2.

Works Well With: Standard skincare actives

Avoid Combining With: No known significant incompatibilities

SCIENTIFIC NOTE

Polysilicone-15's photostability from its silicone backbone exemplifies the photochemical principle of chromophore isolation: the si-o backbone absorbs minimal uv and undergoes no photoinduced bond rearrangements, providing an inert molecular scaffold that prevents photodegradation of the attached malonate chromophore — unlike freestanding organic chromophores that can degrade via radical chain reactions.

Last Verified: Cosing database,dsm parsol slx technical data

Primary Sources: 2026-03-12