Description

Diacetoxymethyl Terminated Polydimethylsiloxane is a specialized organosilicon compound featuring reactive acetoxy end groups. This unique structure makes it a valuable reactive intermediate and cross-linking agent in silicone polymer chemistry. It is primarily sought after by manufacturers in the silicone elastomer, sealant, and specialty coating industries for formulating high-performance, moisture-curing products.

Application

• Cross-linking Agent for RTV-1 Silicones: A key component in one-component, room-temperature vulcanizing (RTV-1) sealants and adhesives that cure upon exposure to atmospheric moisture.
• Reactive Silicone Intermediate: Used in the synthesis of custom silicone polymers, resins, and modified siloxanes with specific end-group functionality.
• Moisture-Curable Coatings: Employed in formulating protective and release coatings that cure at ambient conditions to form durable, flexible films.
• Electrical Potting and Encapsulation: Suitable for creating moisture-resistant, insulating gels and encapsulants for electronic components.
• Adhesive and Sealant Formulations: Provides excellent adhesion and weatherability in high-performance industrial and construction sealants.
• Fabrication of Silicone Rubber: Acts as a chain extender or cross-linker in the production of various silicone rubber goods.

Basic Information

Product Name	Diacetoxymethyl Terminated Polydimethylsiloxane
CAS No.	158465-54-4
Molecular Formula	Typically CnH2n+2O4Sin (n varies by chain length)
Molecular Weight	Varies by degree of polymerization. Contact for details.
Synonyms	Acetoxy-Terminated PDMS; α,ω-Diacetoxymethylpolydimethylsiloxane; Polydimethylsiloxane, diacetoxymethyl-terminated; Acetoxy Silane Terminated Silicone Fluid; Silanol-Terminated PDMS, Acetoxy Ester; Moisture-Curable Silicone Intermediate; RTV Silicone Cross-linker; Methylacetoxysilane-Terminated Siloxane
EINECS	Contact for details.

Quality Control

Our Diacetoxymethyl Terminated Polydimethylsiloxane is manufactured under strict quality control protocols to ensure batch-to-batch consistency and performance. Each lot is analyzed for critical parameters including viscosity, acetoxy content, and purity. A comprehensive Certificate of Analysis (COA) documenting these results is provided with every shipment to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and must be kept sealed under a dry atmosphere (e.g., nitrogen) to prevent premature hydrolysis and maintain reactivity.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Viscosity (25°C)	Specified grade dependent (cSt)
Acetoxy Content	As specified per grade (% wt.)
Specific Gravity (25°C)	0.95 - 1.05
Volatile Content	≤ 2.0%

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