Description

1,1,1,3,5,7,7,7-Octamethyl-3,5-Bis(Trimethylsiloxy) Tetrasiloxane is a high-purity, functional organosilicon compound, specifically a branched methylsiloxane. This chemical is valued for its role as a versatile intermediate and performance additive, offering unique properties derived from its siloxane backbone and reactive trimethylsiloxy groups. It is essential for manufacturers in the silicone polymer, specialty coatings, and advanced materials sectors seeking to enhance product performance, modify surface characteristics, or synthesize custom siloxane architectures.

Application

• Silicone Polymer & Resin Modification: Acts as a chain extender, cross-linking agent, or modifier to tailor the flexibility, thermal stability, and rheological properties of silicone elastomers and resins.
• Surface Treatment & Release Agents: Used in formulations for creating hydrophobic, oleophobic, or easy-release surfaces on textiles, paper, and industrial molds.
• Personal Care & Cosmetic Ingredients: Serves as an emollient, conditioning agent, or volatile carrier in antiperspirants, hair care products, and skin creams due to its smooth texture and compatibility.
• Lubricants & Greases: Incorporated into high-performance silicone-based lubricants and greases for applications requiring wide temperature stability and water repellency.
• Adhesive & Sealant Formulations: Functions as a plasticizer or reactive diluent to improve workability, adhesion, and durability in silicone adhesive and sealant systems.
• Pharmaceutical & Medical Device Coatings: Employed in the development of biocompatible coatings for medical devices and as an intermediate in controlled-release drug delivery systems.
• Electronic Encapsulants & Potting Compounds: Used in the synthesis of siloxane materials for protecting electronic components from moisture, thermal stress, and environmental contaminants.

Basic Information

Item	Detail
Product Name	1,1,1,3,5,7,7,7-Octamethyl-3,5-Bis(Trimethylsiloxy) Tetrasiloxane
CAS No.	2003-92-1
Molecular Formula	C14H42O5Si6
Molecular Weight	458.99 g/mol
Synonyms	Octamethyltrisiloxane-1,7-diol, 1,1,3,3-tetramethyl-disiloxane; 1,1,1,3,5,7,7,7-Octamethyl-3,5-bis[(trimethylsilyl)oxy]tetrasiloxane; MD'M (M=D'=TMS); Tetrasiloxane, 1,1,1,3,5,7,7,7-octamethyl-3,5-bis[(trimethylsilyl)oxy]-; Bis(trimethylsiloxy)methylsiloxy-terminated polydimethylsiloxane; Silicone fluid intermediate
EINECS	Contact for details

Quality Control

Our 1,1,1,3,5,7,7,7-Octamethyl-3,5-Bis(Trimethylsiloxy) Tetrasiloxane is produced under a strict quality management system. Every batch undergoes rigorous analytical testing, including assay by GC or HPLC and identification by FT-IR, to ensure high purity and consistent performance. Certificates of Analysis (COA) documenting key specifications are available upon request to support your quality assurance and regulatory compliance needs.

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 strong bases and incompatible materials such as strong oxidizing agents. For long-term storage, consider using an inert atmosphere to maintain product integrity.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to reference spectrum
Assay (GC/HPLC)	≥ 97.0%
Refractive Index (n20/D)	1.390 - 1.400
Density (20°C)	0.95 - 0.99 g/mL
Water Content (KF)	≤ 0.1%

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