Hexamethylcyclotrisiloxane
CAS 541-05-9
EC 208-765-4
Formula C6H18O3Si3
MW 222.46 g/mol
Silicones & Silicates Personal Care & CosmeticsCoatings, Adhesives, Sealants & ElastomersPlastics & Polymers Cross-linking & CuringSurface Modification & WettingHumectant & Moisturizing
Description
Hexamethylcyclotrisiloxane (CAS 541-05-9) is a cyclic siloxane monomer also identified under trade designations D3, SDK 10, CH7260, LS 8120, and A 13455. It carries no assigned E-code and is classified within the silicones and silicates chemical family.
In personal care formulations, D3 functions as an emollient and hair conditioner by forming a lightweight, breathable film on skin and hair surfaces. In coatings and adhesives, it acts as a crosslinker and adhesion promoter, reacting with polymer matrices to improve surface bonding and film integrity through ring-opening polymerisation under controlled conditions.
Hexamethylcyclotrisiloxane is supplied as a white crystalline solid and falls under HS code 29319090 for customs classification. It is subject to REACH registration requirements within the European Economic Area. Procurement teams should confirm grade specifications and packaging formats directly with the supplier to ensure compliance with application-specific standards.
In personal care formulations, D3 functions as an emollient and hair conditioner by forming a lightweight, breathable film on skin and hair surfaces. In coatings and adhesives, it acts as a crosslinker and adhesion promoter, reacting with polymer matrices to improve surface bonding and film integrity through ring-opening polymerisation under controlled conditions.
Hexamethylcyclotrisiloxane is supplied as a white crystalline solid and falls under HS code 29319090 for customs classification. It is subject to REACH registration requirements within the European Economic Area. Procurement teams should confirm grade specifications and packaging formats directly with the supplier to ensure compliance with application-specific standards.
Physical Properties
| Melting Point | 64.5 °C |
| Boiling Point | 134 °C |
| Density | 1.020 g/cm³ |
| Flash Point | 95 °F |
| Appearance | White crystalline solid |
| Color | White to Almost white |
| Form | solid |
| Water Solubility | may decompose |
| Vapor Pressure | 0.014-671Pa at 24.85-25℃ |
| Log P | -0.38-4.4 at 20-25℃ |
Safety & Handling (Learn More)
Danger GHS02
H
H228
P
P210P240P241P280P370+P378
Trade & Regulatory
| HS Code | 29319090 |
| UN Number | 1325 |
| ADR Class | 4.1 |
| Packing Group | II |
| Storage Class | 4.1B - Flammable solid hazardous materials |
| WGK (Germany) | 3 |
Other Names
2,2,4,4,6,6-hexamethyl-1,3,5,2,4,6-trioxatrisilinaneD 3SDK 10LS 8120A 13455SIH 6105.1hexamethyl-cyclotrisiloxan
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