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Phenyltris(trimethylsiloxy)silane

CAS Number
2116-84-9
EC Number
218-320-6
Chemical Formula
C15H32O3Si4
Molecular Weight
372.75 g/mol

Description

Phenyltris(trimethylsiloxy)silane ( CAS 2116-84-9 ), also known as Tris(trimethylsiloxy)phenylsilane, is a phenyl-functional silicone fluid used across coatings, personal care, and lubrication markets. The phenyl substitution raises refractive index compatibility and thermal stability relative to standard dimethyl silicones, making it a preferred carrier and surface modifier where those properties drive formulation decisions. In personal care, it functions as a lightweight, non-greasy carrier fluid in skin and hair formulations, improving spreadability and delivering a dry, silky after-feel for the end user. Coatings formulators incorporate it to enhance surface wetting and gloss on substrates where conventional silicone fluids underperform optically, ensuring a high-quality finish and superior performance. In high-temperature lubricant systems, it serves as a base fluid or additive where thermal resistance beyond standard silicone oils is required for demanding industrial environments and machinery. Adhesive and sealant manufacturers use it as a processing aid or reactive diluent to adjust viscosity and surface adhesion profiles, allowing for precise control over the final product characteristics. Phenyltris(trimethylsiloxy)silane is supplied as a clear, low-viscosity liquid. It is available in technical and cosmetic grades, with cosmetic-grade material meeting purity requirements for personal care applications. Packaging typically ranges from small laboratory quantities through drum and IBC volumes for industrial supply, ensuring flexible logistics for manufacturers and researchers across various global sectors. Contact us for supply of Phenyltris(trimethylsiloxy)silane Request Quote

Other Names (Synonyms)

Tris(trimethylsiloxy)phenylsilane | 1,1,1,5,5,5-Hexamethyl-3-phenyl-3-(trimethylsilyloxy)trisiloxane | RefChem:1051654 | trimethyl-[phenyl-bis(trimethylsilyloxy)silyl]oxysilane | Trisiloxane, 1,1,1,5,5,5-hexamethyl-3-phenyl-3-[(trimethylsilyl)oxy]- | Trisiloxane, 1,1,1,5,5,5-hexamethyl-3-phenyl-3-(trimethylsiloxy)- | Dow Corning 556

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point-102 °C
Boiling Point264-266 °C
Density0.924 g/cm³
Flash Point127°C
ColorColorless to Almost colorless
Formclear liquid
Water Solubility6.6μg/L at 23℃
Vapor Pressure0.09Pa at 25℃
Refractive Indexn 20/D 1.437
Log P9 at 20℃

Safety & Handling

Danger
GHS06· ToxicGHS07· Irritant

Hazard Statements

H315Causes skin irritation
H319Causes serious eye irritation
H330Fatal if inhaled
H335May cause respiratory irritation

Precautionary Statements

P260Do not breathe dust/fume/gas/mist/vapours/spray.
P261Avoid breathing dust/fume/gas/mist/vapours/spray.
P264Wash … thoroughly after handling.
P271Use only outdoors or in a well-ventilated area.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P284In case of inadequate ventilation wear respiratory protection.
P316Get emergency medical help immediately.
P319Get medical advice/attention if you feel unwell.
P320Specific treatment is urgent (see … on this label).
P321Specific treatment (see … on this label).
P405Store locked up.
P501Dispose of contents/container in accordance with local regulations.
P265Wash … thoroughly after handling.
P352IF ON SKIN: Wash with plenty of water.
P340IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P317Get emergency medical help.
P317If eye irritation persists: Get medical advice/attention. Get emergency medical help.
P364Take off contaminated clothing and wash it before reuse.
P233Store in a well-ventilated place. Keep container tightly closed.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code2931.90.9010
WGK (Germany)1