Description

1,1,3,3,5,5,7,7-Octamethyl-2,6-Dioxa-1,3,5,7-Tetrasilacyclooctane is a high-purity, volatile cyclic siloxane compound, also known as octamethylcyclotetrasiloxane (D4). This material serves as a critical precursor and intermediate in the synthesis of silicone polymers and specialty organosilicon materials. It is essential for manufacturers in the silicone, personal care, and electronics industries seeking reliable raw materials for high-performance applications.

Application

• Silicone Polymer Synthesis: A fundamental monomer for the production of polydimethylsiloxanes (PDMS) and other silicone oils, elastomers, and resins.
• Personal Care & Cosmetics: Used as a volatile carrier and emollient in antiperspirants, deodorants, and skin care formulations due to its smooth feel and evaporation properties.
• Electronics & Semiconductor Manufacturing: Employed as a precursor in chemical vapor deposition (CVD) processes for depositing silicon dioxide insulating layers.
• Release Agents & Lubricants: Acts as a base fluid or additive in mold release agents and high-temperature lubricants.
• Surface Treatment: Used to modify surface properties, providing water repellency and improving flow characteristics in powders and coatings.
• Chemical Intermediate: Serves as a key building block for the synthesis of more complex functional siloxanes and silanes.

Basic Information

Product Name	1,1,3,3,5,5,7,7-Octamethyl-2,6-Dioxa-1,3,5,7-Tetrasilacyclooctane
CAS No.	15261-06-0
Molecular Formula	C8H24O2Si4
Molecular Weight	296.62 g/mol
Synonyms	Octamethylcyclotetrasiloxane; D4; Cyclotetrasiloxane, octamethyl-; 2,2,4,4,6,6,8,8-Octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane; Tetramer; OMCTS; Dodecamethylcyclohexasiloxane (related higher homologue); Cyclic volatile methylsiloxane (cVMS)
EINECS	239-294-7

Quality Control

Our 1,1,3,3,5,5,7,7-Octamethyl-2,6-Dioxa-1,3,5,7-Tetrasilacyclooctane is manufactured under strict quality systems. Each batch undergoes rigorous analytical testing, including gas chromatography (GC), to ensure high purity and consistency. Certificates of Analysis (COA) detailing specific batch results are provided to guarantee compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, well-ventilated area away from heat sources and open flame. Due to its highly volatile nature, ensure containers are kept tightly sealed when not in use to prevent evaporation and maintain product integrity. Recommended storage temperature is 15-25°C.

Specification

Item	Specification
Appearance	Colorless clear liquid
Identification (IR)	Conforms to standard
Assay (GC)	≥ 99.0%
Refractive Index (n20D)	1.396 - 1.398
Density (20°C)	0.955 - 0.959 g/mL
Water Content (KF)	≤ 0.05%

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