Description

Methoxy Terminated Polydimethylsiloxane is a specialized silicone fluid featuring reactive methoxy end groups, offering unique reactivity and compatibility compared to standard polydimethylsiloxanes. This functionalized polymer is a crucial intermediate and additive, enabling cross-linking, surface modification, and property enhancement in advanced material formulations. It is essential for manufacturers in the adhesives, sealants, coatings, and personal care industries seeking to improve product performance, durability, and processing characteristics.

Application

• As a reactive intermediate in the synthesis of silicone resins, elastomers, and block copolymers.
• As a chain extender or cross-linking agent in moisture-curable silicone sealants and RTV (Room Temperature Vulcanizing) adhesives.
• As a surface treatment agent or coupling agent to modify the surface properties of inorganic fillers (e.g., silica, calcium carbonate) for improved dispersion in polymer matrices.
• As a key ingredient in release coatings and anti-adhesive formulations.
• As a flow control, leveling, or mar-resistant additive in high-performance industrial and protective coatings.
• As a conditioning agent and emollient in specialized personal care products, providing a non-greasy, silky feel.
• In the formulation of defoamers and antifoaming agents for various industrial processes.
• For use in dielectric fluids and potting compounds in the electronics industry.

Basic Information

Product Name	Methoxy Terminated Polydimethylsiloxane
CAS No.	68951-97-3
Molecular Formula	(C2H6OSi)n • C3H9O3Si
Molecular Weight	Varies by chain length (n)
Synonyms	α,ω-Bis(trimethoxysilyl)polydimethylsiloxane; Methoxy-Functional Polydimethylsiloxane; Trimethoxysilyl Terminated PDMS; Polydimethylsiloxane, trimethoxysilyl-terminated; PDMS, methoxy terminated; Silicone fluid, methoxy-terminated; Reactive silicone oil; Methoxy silicone fluid
EINECS	Contact for details

Quality Control

Our Methoxy Terminated Polydimethylsiloxane is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistency in viscosity, methoxy content, reactivity, and purity. Certificates of Analysis (COA) detailing key specifications are provided with every shipment to guarantee compliance with your formulation requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This product is moisture-sensitive (hygroscopic); containers must be kept tightly sealed to prevent reaction with atmospheric moisture. Keep away from strong acids, bases, and oxidizing agents.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Viscosity (25°C)	Specified grade dependent (cSt)
Methoxy Content	As per grade (by Titration)
Specific Gravity (25°C)	0.96 - 1.02
Refractive Index (25°C)	1.400 - 1.410
Volatile Content	< 1.0%
Identification	Complies (IR)

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