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Volatile silicone

CYCLOHEPTASILOXANE

CAS 107-50-6
50

Safety score · 0–100

Moderate

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

Cycloheptasiloxane, also called D7, is a volatile silicone that lends a silky, fast-drying feel. EU regulators flag cyclic siloxanes for environmental persistence, so its cosmetic use is increasingly constrained.

Function

ANTICAKING, SKIN CONDITIONING - EMOLLIENT, SKIN CONDITIONING, SOLVENT

Skin benefits

  • Volatile silicone giving light slip and a silky feel
  • Helps spread other actives evenly across the skin
  • Evaporates quickly without residue

Known concerns

  • Cyclic siloxane group is under restriction in EU rinse-off products due to PBT concerns
  • Environmental persistence and bioaccumulation flagged by ECHA
  • Often co-occurs with D4 and D5 impurities that face stricter limits
  • Inhalation exposure questioned in spray formats

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.