Description

1,7-Dimethoxy Octamethyltetrasiloxane is a specialized organosilicon compound, specifically a methoxy-functionalized linear siloxane. This chemical serves as a versatile intermediate and functional additive, valued for its ability to modify surface properties and polymer characteristics. It is primarily sought by manufacturers in the silicone polymer, coatings, and specialty chemical industries for applications requiring controlled reactivity and compatibility.

Application

• Silicone Intermediate: A key building block in the synthesis of modified silicone oils, resins, and elastomers.
• Surface Treatment Agent: Used to impart water repellency, release properties, and improved adhesion to various substrates including glass, metals, and plastics.
• Crosslinking Agent: Functions as a reactive crosslinker in silicone sealants, adhesives, and room-temperature-vulcanizing (RTV) systems.
• Lubricant & Fluid Additive: Employed as a base fluid or additive in high-performance lubricants and damping fluids due to its thermal stability and low volatility.
• Cosmetic & Personal Care: Used in formulations for hair conditioners, skin care products, and antiperspirants to provide a smooth, non-greasy feel.
• Pharmaceutical & Medical: Acts as an excipient or processing aid in controlled-release drug delivery systems and medical device coatings.

Basic Information

Item	Detail
Product Name	1,7-Dimethoxy Octamethyltetrasiloxane
CAS No.	17928-31-3
Molecular Formula	C10H30O5Si4
Molecular Weight	370.78 g/mol
Synonyms	Octamethyl-1,7-dimethoxytetrasiloxane; 1,7-Dimethoxyoctamethyltetrasiloxane; Dimethoxyoctamethyltetrasiloxane; Tetrasiloxane, 1,7-dimethoxyoctamethyl-; Linear Methoxy Siloxane; Methoxy-Terminated Polydimethylsiloxane (low MW); MD'M (where D' = OCH3); Silane, diethoxy, hydrolysis products with dichlorodimethylsilane
EINECS	Contact for details

Quality Control

Our 1,7-Dimethoxy Octamethyltetrasiloxane is produced under strict quality management systems. Each batch undergoes comprehensive analytical testing to ensure high purity and consistent performance. Certificates of Analysis (COA) detailing purity, identity, and key physical parameters are available upon request to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from heat sources and incompatible materials. Recommended storage temperature is 15-25°C. This material is moisture-sensitive (hygroscopic); keep container tightly sealed when not in use to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 95.0%
Refractive Index (20°C)	1.3900 - 1.3950
Density (20°C)	0.95 - 0.99 g/mL
Moisture (Karl Fischer)	≤ 0.1%

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