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Quick answer: Both score equally on our risk model. Cyclopentasiloxane is restricted in the EU and allowed in the US; Octamethylcyclotetrasiloxane is restricted in the EU and allowed in the US.
| Property | Cyclopentasiloxane | Octamethylcyclotetrasiloxane |
|---|---|---|
| EU status | Restricted | Restricted |
| US status | Allowed | Allowed |
| Risk level | medium | medium |
| Banned in | — | — |
| Restricted in | European Union | European Union |
| Category | endocrine disruptor | endocrine disruptor |
| Where it hides | hair serum, primer, deodorant | hair products, deodorant |
Cyclopentasiloxane is a volatile silicone (D5) used for smooth, silky texture.
Octamethylcyclotetrasiloxane (Cyclotetrasiloxane) is a volatile silicone (D4).
Cyclopentasiloxane: Persistent and bioaccumulative; the EU restricts D5 in wash-off products over environmental and endocrine concerns. The US has no restriction.
Octamethylcyclotetrasiloxane: A persistent, bioaccumulative endocrine disruptor; the EU restricts D4.
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