Description

1,1,3,3,5,5,7,7-Octamethyl-1,3,5,7-Tetrasilacyclooctane is a high-purity, cyclic organosilicon compound, also known as octamethylcyclotetrasiloxane (D4), serving as a key monomer and intermediate in silicone polymer synthesis. Its value lies in providing a controlled, high-purity building block for producing linear and cross-linked siloxane polymers with precise molecular weight and properties. This chemical is essential for manufacturers in the silicone elastomer, sealant, lubricant, and personal care industries seeking consistent raw material quality for reliable end-product performance.

Application

• Silicone Polymer Synthesis: Primary monomer for the ring-opening polymerization to produce polydimethylsiloxane (PDMS) fluids, gums, and resins.
• Elastomers & Sealants: A fundamental raw material in the manufacture of high-performance silicone rubbers, gaskets, and construction sealants.
• Personal Care & Cosmetics: Used in the production of volatile and non-volatile silicone fluids for antiperspirants, hair conditioners, and skin care products, providing smooth texture and spreadability.
• Lubricants & Release Agents: Serves as a precursor for silicone-based lubricants, mold release agents, and antifoaming agents in industrial processes.
• Electrical Insulation: A key component in formulating silicone gels and potting compounds for electronic encapsulation and insulation.
• Pharmaceutical Intermediates: Employed as a starting material or intermediate in the synthesis of specialized organosilicon compounds for pharmaceutical applications.
• Surface Treatment: Used to create hydrophobic coatings and surface modifiers for textiles, paper, and various materials.

Basic Information

Product Name	1,1,3,3,5,5,7,7-Octamethyl-1,3,5,7-Tetrasilacyclooctane
CAS No.	1747-57-5
Molecular Formula	C8H24O4Si4
Molecular Weight	296.62 g/mol
Synonyms	Octamethylcyclotetrasiloxane; D4; Cyclotetrasiloxane, octamethyl-; OMCTS; 2,2,4,4,6,6,8,8-Octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane; Tetramer; D4 Siloxane; Cyclic tetramer of dimethylsiloxane
EINECS	217-136-7

Quality Control

Our 1,1,3,3,5,5,7,7-Octamethyl-1,3,5,7-Tetrasilacyclooctane is manufactured under a strict quality management system to ensure batch-to-batch consistency and high purity. Production adheres to relevant industry standards, and each lot is supported by a comprehensive Certificate of Analysis (COA) detailing key parameters such as assay, identity, and impurity profiles. We are committed to meeting the stringent requirements of the silicone polymer industry and can provide material tailored to specific technical specifications upon request.

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. Containers 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)	≥ 99.0%
Water Content (KF)	≤ 0.05%
Refractive Index (n20/D)	1.396 - 1.398
Density (20°C)	0.955 - 0.958 g/cm³

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