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Ingredient · INCI reference

Polysilicone-15

a.k.a. Parsol SLX

CAS 207574-74-1

Polysilicone-15, marketed as Parsol SLX, is a newer-generation organic UVB filter built on a silicone polymer backbone. It is approved up to 10% in the EU, Japan (quasi-drug), and Korea, and is pending in the US. It is photostable, EWG rates it 1, and it appears in 241 catalog products.

Modern organic Next-gen photostable chemical filters. Gen · new organic
01 Spectrum coverage UVB
UVB 290–320nm UVB (290–320nm) — covered UVA-II 320–340nm UVA-II (320–340nm) — not covered UVA-I 340–400nm UVA-I (340–400nm) — not covered
02 Regional approval · max %
JP ✓ 10% Japan: Approved · max 10% KR ✓ 10% South Korea: Approved · max 10% EU ✓ 10% Europe: Approved · max 10% US · — United States: Pending
03 Safety profile
EWG score
1
Reef-toxic
No
Endocrine disruptor
No
Comedogenicity
0
Reference

Frequently asked questions

What is Parsol SLX?

Parsol SLX is the trade name for Polysilicone-15, a UVB filter built on a silicone polymer. The polymeric structure tends to stay on the skin surface and gives a smooth sensory feel.

Is Polysilicone-15 available in US sunscreens?

Not yet in over-the-counter US sunscreens. Its status in the US is pending. It is already approved at up to 10% in the EU, Japan, and Korea, where it is widely used.

What part of the UV spectrum does it cover?

It absorbs in the UVB range. It contributes to sunburn-wavelength protection but needs to be paired with UVA filters to give broad-spectrum coverage.

Is Polysilicone-15 photostable?

Yes. It is a photostable UV filter and can also help stabilize other less photostable filters in a formula, which is one reason it is common in modern UVB blends.

Products in catalogue

Containing Polysilicone-15