# Octamethylcyclotetrasiloxane

URL: https://app.greenveil.ai/ingredients/ingredient_cas_556_67_2
Categories: beauty, cleaning, food, industrial, pharma
Functions: Defoamer, Processing aids not otherwise specified, Solvent, Surfactant (surface active agent), Wetting agent (non-aqueous), component of silicone gasketing options, component of silicone gasketing options., component of silicone threshold options, component of silicone threshold options., octamethylcyclotetrasiloxane
Identifier: 556-67-2

> Octamethylcyclotetrasiloxane is used as defoamer / processing aids not otherwise specified. Greenveil chemical-concern score: 100/100 — Critical concern driven by cmr.. Assessed from 6 sources.

## Safety assessment

- Chemical concern score: 100/100 — Critical concern driven by cmr.
- Confidence: 4
- Rationale: Octamethylcyclotetrasiloxane; D4 is prohibited in cosmetic products under Annex II of the EU Cosmetics Regulation (EC) 1223/2009.

## Regulatory status

- EU: banned — Annex II of EU Cosmetics Regulation (EC) 1223/2009: substances prohibited in cosmetic products. CMR: Reprotoxic Cat. 2()
- US: commercial use observed — EPA CPDat observed this chemical in 130 composition records across product categories including Construction and building materials, Industrial products, Raw materials. EPA CPDat classifies this chemical for functional uses including Solvent, Surfactant (surface active agent), Processing aids not otherwise specified.
- US: listed in openFDA substance — openFDA substance registry classifies this ingredient as chemical.

_Assessed by Greenveil._