Product Description
Decamethylcyclopentasiloxane (D5, INCI name: cyclopentasiloxane) is a colorless, odorless, volatile cyclic methyl siloxane liquid. With a well-established toxicological and safety profile, it is widely used in personal-care and beauty formulations — including deodorants, antiperspirants, color cosmetics, shampoos, conditioners, body lotions, and other skin- and hair-care products.
D5 is readily miscible with ethanol and most common cosmetic solvents, making it a versatile carrier and emollient for a broad range of health and beauty applications.
Product Parameters
| Melting point | -44°C |
| Boiling point | 90 °C/10 mmHg (lit.) |
| density | 0.958 g/mL at 25 °C (lit.) |
| vapor pressure | 33.2Pa at 25℃ |
| refractive index | n20/D 1.396(lit.) |
| Fp | 162 °F |
| storage temp. | 2-8°C |
| solubility | <0.0001g/l (calculated) |
| form | Liquid |
| color | Colorless |
| Specific Gravity | 0.959 |
| explosive limit | 0.52-7%(V) |
| Water Solubility | Immiscible with water. |
| Hydrolytic Sensitivity | 1: no significant reaction with aqueous systems |
| Merck | 142848 |
| BRN | 1800166 |
| Dielectric constant | 2.5（20℃） |
| Stability: | Stable. Incompatible with strong oxidizing agents. |
| InChIKey | XMSXQFUHVRWGNA-UHFFFAOYSA-N |
| LogP | 8.07 at 24.6℃ |
| CAS DataBase Reference | 541-02-6(CAS DataBase Reference) |
| NIST Chemistry Reference | Decamethylcyclopentasiloxane(541-02-6) |
| EPA Substance Registry System | Decamethylcyclopentasiloxane (541-02-6) |
| Hazard Codes | Xi |
| Risk Statements | 36/37/38-53 |
| Safety Statements | 23-24/25-36-26 |
| RIDADR | NA 1993 / PGIII |
| WGK Germany | 2 |
| RTECS | GY5945200 |
| TSCA | Yes |
| HS Code | 29310095 |
| Hazardous Substances Data | 541-02-6(Hazardous Substances Data) |
| Toxicity | LD50 oral in rat: > 24134mg/kg |
Application Scenarios
D5 is a widely used carrier and emollient across color cosmetics, skin care, and hair-care products. Its ready miscibility with ethanol and most common cosmetic solvents makes it compatible with a broad range of formulation systems and beauty-care applications.
