Description

Vinylpentamethyldisiloxane is a highly versatile organosilicon monomer featuring a reactive vinyl group and a disiloxane backbone. This compound is a critical building block in the synthesis of silicone polymers and functional materials, offering a unique combination of reactivity and stability. It is essential for manufacturers in the silicone elastomer, resin, and specialty chemical industries seeking to introduce vinyl functionality for cross-linking or further chemical modification.

Application

• Silicone Polymer Synthesis: A key monomer for producing vinyl-functional silicone fluids, gums, and resins used in high-performance elastomers.
• Cross-linking Agent: Serves as a reactive site in addition-cure (platinum-catalyzed) silicone systems for liquid silicone rubber (LSR) and high-consistency rubber (HCR).
• Surface Modification: Used to impart hydrophobic or release properties to surfaces via grafting or coating formulations.
• Intermediate for Specialty Silanes: Acts as a precursor for synthesizing more complex organofunctional silanes and siloxanes.
• Adhesives & Sealants: Incorporated into formulations to enhance cure properties and adhesion characteristics.
• Release Coatings: A component in formulations for paper, film, and industrial release liners.

Basic Information

Product Name	Vinylpentamethyldisiloxane
CAS No.	1438-79-5
Molecular Formula	C7H20OSi2
Molecular Weight	176.41 g/mol
Synonyms	1,1,1,3,3-Pentamethyl-3-vinyldisiloxane; Divinyltetramethyldisiloxane (common misnomer, check context); Vinyl-Pentamethyldisiloxane; VPMDS; Vinyl-terminated pentamethyldisiloxane; Disiloxane, 1,1,1,3,3-pentamethyl-3-vinyl-; 3-Ethenyl-1,1,1,3,3-pentamethyldisiloxane
EINECS	215-873-8

Quality Control

Our Vinylpentamethyldisiloxane is produced under stringent quality management systems. Each batch undergoes comprehensive analytical testing, including gas chromatography (GC) for purity and identity verification, to ensure it meets precise specifications for silicone polymer applications. Certificates of Analysis (COA) detailing purity, assay, and impurity profiles are provided with every shipment to guarantee supply consistency and reliability for your production processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, well-ventilated area away from heat sources and incompatible materials. Due to its highly volatile nature, ensure containers are kept tightly sealed when not in use to prevent evaporation and maintain product integrity. Recommended storage temperature is 2-25°C.

Specification

Item	Specification
Appearance	Colorless clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 98.0%
Refractive Index (n20D)	1.390 - 1.395
Density (20°C)	0.78 - 0.82 g/mL

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