<!-- Polysilicone-15 (Parsol SLX): is it reef safe? | Reef Label -->
Source: https://reeflabel.com/ingredients/polysilicone-15/

Chemical (organic) UV filter · Reef research: Limited data

# Polysilicone-15 (Parsol SLX)

A silicone-based UVB filter used outside the US.

Banned in

-   Palau

Also excluded where only mineral sunscreen is allowed

-   Maui County
-   Hawaiʻi County

Not approved in the US, so US sunscreens do not contain it.

## Where it’s restricted

Named in the law or guidance

| Location | Status | Since |
| --- | --- | --- |
| [Palau](https://reeflabel.com/locations/palau/) [law text ↗](https://www.palaugov.pw/wp-content/uploads/2018/10/RPPL-No.-10-30-re.-The-Responsible-Tourism-Education-Act-of-2018.pdf) | In force | January 1, 2020 |

### Also not allowed under mineral-only rules

Polysilicone-15 (Parsol SLX) isn’t named in these laws, but they allow only mineral (zinc oxide or titanium dioxide) sunscreens, so a product containing it is excluded anyway.

-   [Maui County (Maui, Molokaʻi, Lānaʻi)](https://reeflabel.com/locations/maui-county/) (in force since October 1, 2022)
-   [Hawaiʻi County (Big Island)](https://reeflabel.com/locations/hawaii-county/) (in force since December 1, 2022)

## What the reef research says

No peer-reviewed study of polysilicone-15 in corals, reef fish or other marine organisms turned up in PubMed, and a search pairing its names with coral, reef, marine and aquatic terms returned no records. PubMed returns four records for its names: two skin-allergy reports (Suzuki et al. 2022; Sarre et al. 2014), an in vitro sun-protection study (Couteau et al. 2007) and a LactMed entry on sunscreens and breastfeeding. The Couteau study measured SPF in a lab, not effects on marine life.

-   [PubMed E-utilities search: polysilicone-15, Parsol SLX or polysilicone 15 in title/abstract](https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?db=pubmed&term=\(polysilicone-15%5BTitle%2FAbstract%5D+OR+%22Parsol+SLX%22%5BTitle%2FAbstract%5D+OR+%22polysilicone+15%22%5BTitle%2FAbstract%5D\)&retmode=json)
-   [PubMed E-utilities search: Parsol SLX or polysilicone-15 with coral, reef, marine or aquatic](https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?db=pubmed&term=\(Parsol+SLX+OR+polysilicone-15\)+AND+\(coral+OR+reef+OR+marine+OR+aquatic\)&retmode=json)
-   [PubMed records 41730063, 35306675, 24450826, 17663193 (E-utilities efetch)](https://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=pubmed&id=41730063,35306675,24450826,17663193&rettype=abstract&retmode=text)

## Products that contain it (1)

[

Ocean Potion

SPF 50 Sport Sunscreen Lotion

SPF 50 · lotion · Chemical/hybrid

Allowed in 4 of 9 placesNot allowed: Maui County, Hawaiʻi County +3

](https://reeflabel.com/products/ocean-potion-spf-50-sport-sunscreen-lotion/)

[Search these products that list polysilicone-15 →](https://reeflabel.com/products/?q=polysilicone-15)

**Related ingredients:** [Oxybenzone](https://reeflabel.com/ingredients/oxybenzone/), [Homosalate](https://reeflabel.com/ingredients/homosalate/)

Last reviewed October 14, 2026.

### Label names we match

-   polysilicone-15
-   polysilicone 15
-   parsol slx

### Regulatory status

**Wikidata:** [Q7226938](https://www.wikidata.org/wiki/Q7226938)

**US FDA:** Not approved in the US.

**EU:** Approved, max 10%.

**Protects against:** UVB.