Description

2,2,4,4,6,6,8,8-Octamethyl-1,3,5-Trioxa-2,4,6,8-Tetrasilacyclooctane is a high-purity, cyclic siloxane compound valued for its role as a versatile chemical intermediate and precursor. Its primary commercial significance lies in its ability to introduce specific siloxane structures into polymers and advanced materials, enhancing properties like thermal stability and hydrophobicity. This product is essential for manufacturers in the silicone polymer, specialty coatings, and electronics industries seeking to develop high-performance materials.

Application

• As a key monomer or cross-linking agent in the synthesis of specialty silicone resins and polymers.
• As a precursor for surface modification agents, imparting water-repellent (hydrophobic) characteristics to various substrates.
• In the formulation of advanced release coatings and pressure-sensitive adhesives.
• As an intermediate in the production of silane coupling agents for composite materials.
• In the electronics industry for dielectric materials and encapsulation compounds.
• For research and development of novel organosilicon compounds with tailored properties.

Basic Information

Product Name	2,2,4,4,6,6,8,8-Octamethyl-1,3,5-Trioxa-2,4,6,8-Tetrasilacyclooctane
CAS No.	19939-05-0
Molecular Formula	C8H24O3Si4
Molecular Weight	296.62 g/mol
Synonyms	Octamethylcyclotetrasiloxane, D4; OMCTS; Cyclic tetramer of dimethylsiloxane; Octamethylcyclotetrasiloxane; 2,2,4,4,6,6,8,8-Octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane; Octamethyl-1,3,5,7-tetraoxa-2,4,6,8-tetrasilacyclooctane; D4 Siloxane
EINECS	243-426-1

Quality Control

Our 2,2,4,4,6,6,8,8-Octamethyl-1,3,5-Trioxa-2,4,6,8-Tetrasilacyclooctane is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including gas chromatography (GC), to ensure it meets precise purity and compositional specifications. Certificates of Analysis (COA) detailing all quality parameters are provided with every shipment to guarantee traceability and consistency for your production processes.

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
Assay (GC)	≥ 98.0%
Refractive Index (n20D)	1.396 - 1.398
Density (20°C)	0.95 - 0.97 g/cm³
Water Content (KF)	≤ 0.05%

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