Description

1,1,3,3,5,5,7,7-Octamethyltetrasiloxane is a linear, fully methylated tetrasiloxane fluid, a key member of the polydimethylsiloxane (PDMS) family. This compound serves as a versatile intermediate and functional fluid, valued for its low viscosity, high thermal stability, and excellent dielectric properties. It is essential for manufacturers in the silicone, electronics, and personal care industries seeking to formulate high-performance products.

Application

• Silicone Intermediate: A crucial building block for the synthesis of higher molecular weight silicone polymers, resins, and copolymers via equilibration reactions.
• Lubricant & Heat Transfer Fluid: Used as a base fluid or additive in specialty lubricants and thermal fluids for high-temperature applications due to its stability.
• Dielectric Fluid: Employed in electronic cooling and insulating applications where a stable, non-conductive, and thermally resistant medium is required.
• Personal Care & Cosmetics: Acts as a volatile carrier, emollient, and solvent in antiperspirants, hair care products, and skin creams, providing a smooth, non-greasy feel.
• Release Agent & Defoamer: Functions as a component in mold release formulations for plastics and rubber, and as an antifoam agent in industrial processes.
• Chemical Research & Synthesis: Serves as a standard, reagent, or starting material in organosilicon chemistry research and fine chemical production.

Basic Information

Product Name	1,1,3,3,5,5,7,7-Octamethyltetrasiloxane
CAS No.	1000-05-1
Molecular Formula	C8H28O3Si4
Molecular Weight	296.66 g/mol
Synonyms	Octamethyltetrasiloxane; MD2M; Tetrakis(dimethylsiloxy)silane; 1,1,3,3,5,5,7,7-Octamethyl-1,7-dihydroxytetrasiloxane (hydrolyzed form); Linear Tetrasiloxane; Polydimethylsiloxane, tetramer; Me8T2; OMTS
EINECS	213-666-4

Quality Control

Our 1,1,3,3,5,5,7,7-Octamethyltetrasiloxane is produced under a stringent quality management system. Each batch undergoes rigorous analytical testing to ensure consistency, purity, and compliance with agreed specifications. Certificates of Analysis (COA) documenting identity, assay, and impurity profiles are available for every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from heat, sparks, and open flame. The container should be kept tightly sealed when not in use to prevent moisture absorption and maintain product integrity.

Specification

Item	Specification
Appearance	Colorless clear liquid
Identification (IR)	Conforms to standard
Assay (GC)	≥ 98.0%
Refractive Index (n20D)	1.3880 - 1.3920
Density (20°C)	0.85 - 0.87 g/cm³
Water Content (KF)	≤ 0.1%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.