Description

Methoxy Terminated Polydimethylsiloxane is a specialized organosilicon polymer featuring reactive methoxy (-OCH3) end groups, which provide unique reactivity compared to standard trimethylsilyl-terminated PDMS. This functionalization makes it a valuable intermediate and additive for creating tailored silicone networks and modifying surface properties. It is essential for manufacturers in the adhesives, sealants, coatings, and personal care industries seeking to enhance product performance through controlled cross-linking and improved compatibility.

Application

• Silicone Resin & Rubber Modification: Acts as a reactive plasticizer and chain extender in room-temperature vulcanizing (RTV) and high-temperature vulcanizing (HTV) silicone elastomers.
• Adhesive & Sealant Formulations: Used as a key component in moisture-curing sealants and adhesives, where the methoxy groups react with atmospheric moisture to form durable, flexible bonds.
• Surface Treatment & Coatings: Serves as a coupling agent or primer to improve adhesion between organic polymers and inorganic substrates like glass, metals, or minerals.
• Release Agent Production: Employed in the synthesis of silicone-based release coatings for labels, tapes, and baking papers.
• Personal Care & Cosmetic Ingredients: Functions as a conditioning agent and emollient in hair care and skincare products, offering improved substantivity.
• Pharmaceutical & Medical Device Lubricants: Used in specialized lubricant formulations for medical devices due to its biocompatibility and controlled reactivity.
• Fiber & Textile Treatment: Imparts water repellency, softness, and lubricity to synthetic and natural fibers.
• Polymer Additive: Enhances the processing and surface characteristics of engineering plastics and composites.

Basic Information

Product Name	Methoxy Terminated Polydimethylsiloxane
CAS No.	70851-25-1
Molecular Formula	(C2H6OSi)n•C3H9O3Si
Molecular Weight	Varies by chain length (n)
Synonyms	α,ω-Dimethoxypolydimethylsiloxane; Methoxy-Functional Silicone Fluid; Methoxy PDMS; Polydimethylsiloxane, methoxy terminated; Dimethicone, methoxy-terminated; Silicone fluid AK 1000 (trade name variant); Reactive silicone oil; Methoxysilane-terminated PDMS
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 consistent viscosity, methoxy content, and purity, meeting the specifications required for high-performance industrial applications. Certificates of Analysis (COA) detailing key parameters are available 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 the container tightly sealed when not in use to prevent moisture absorption, which can initiate premature condensation reactions.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Viscosity (25°C)	50 - 100,000 cSt (Grade dependent)
Methoxy Content	≥ 1.0 % (w/w)
Specific Gravity (25°C)	0.95 - 0.98
Refractive Index (n20D)	1.400 - 1.410
Volatile Content (150°C, 3h)	≤ 2.0 %
Identification (IR)	Conforms to structure

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