Description

Octamethyl-1,4-Dioxa-2,3,5,6-Tetrasilacyclohexane is a high-purity organosilicon compound, specifically a cyclic siloxane derivative, valued for its role as a key intermediate and functional additive. Its unique molecular structure, featuring alternating silicon and oxygen atoms in a ring, provides exceptional thermal stability and chemical inertness, making it a critical component in advanced material synthesis. This product is essential for manufacturers in the silicone polymer, specialty coatings, and electronics industries seeking to enhance product performance and process reliability.

Application

• Silicone Polymer & Elastomer Production: Serves as a cross-linking agent or chain extender to modify polymer architecture and improve mechanical properties.
• Specialty Release Coatings & Adhesives: Used as a reactive intermediate to formulate high-performance, thermally stable release liners and pressure-sensitive adhesives.
• Electronic Encapsulants & Potting Compounds: Functions as a precursor for silicones used to protect sensitive electronic components from moisture and thermal stress.
• High-Temperature Resistant Coatings: A building block for synthesizing silicone resins applied in automotive, aerospace, and industrial coatings.
• Lubricant & Grease Additives: Imparts superior lubricity and stability under extreme pressure and temperature conditions.
• Pharmaceutical & Cosmetic Silicone Intermediates: Used in the controlled synthesis of silicone fluids and gels for personal care and medical device applications.

Basic Information

Product Name	Octamethyl-1,4-Dioxa-2,3,5,6-Tetrasilacyclohexane
CAS No.	17865-73-5
Molecular Formula	C8H24O2Si4
Molecular Weight	268.64 g/mol
Synonyms	Octamethylcyclotetrasiloxane (common misnomer for the dioxa derivative); 2,2,4,4,6,6,8,8-Octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane; 1,4-Dioxa-2,3,5,6-tetrasilacyclohexane, octamethyl-; Cyclic Siloxane Dimer; D4 Derivative; Tetrameric Methyl Siloxane Dioxide; HMDSO Cyclic Dimer (derived from Hexamethyldisiloxane)
EINECS	241-816-6

Quality Control

Our production of Octamethyl-1,4-Dioxa-2,3,5,6-Tetrasilacyclohexane adheres to a strict quality management system. Every batch undergoes rigorous analytical testing, including GC, NMR, and FTIR, to ensure identity, purity, and consistency. Certificates of Analysis (COA) detailing all specifications are provided with each shipment. We support compliance with global regulatory frameworks, including REACH, and can tailor quality protocols to meet specific customer or GMP requirements for advanced applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). The product is moisture-sensitive (hygroscopic); keep the container tightly sealed under an inert atmosphere (e.g., nitrogen) to prevent degradation. Keep away from strong acids, bases, and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to reference spectrum
Assay (GC)	≥ 98.0%
Water Content (KF)	≤ 0.1%
Refractive Index (n20D)	1.390 - 1.395
Density (20°C)	0.95 - 0.98 g/cm³

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