Description

(Dimethylvinylsilyloxy)Heptacyclopentyl T8 Silsesquioxane is a highly specialized organosilicon compound belonging to the polyhedral oligomeric silsesquioxane (POSS®) family, characterized by its unique heptacyclopentyl cage structure functionalized with a dimethylvinylsilyloxy group. This compound is valued for its ability to act as a precise molecular building block or nanoscale additive, imparting enhanced thermal stability, mechanical strength, and tailored surface properties to advanced materials. It is primarily sought by R&D scientists and material formulators in the semiconductor, aerospace, high-performance coatings, and specialty polymer composites industries for developing next-generation hybrid organic-inorganic materials.

Application

• Advanced Polymer Composites: As a reactive nanofiller to enhance thermal stability, modulus, and flame retardancy of epoxy, silicone, and polyimide resins.
• Specialty Coatings & Films: Used to formulate high-temperature, abrasion-resistant, and low-dielectric constant coatings for microelectronics and optical applications.
• Semiconductor Precursors: Serves as a high-purity molecular source for spin-on dielectric (SOD) materials and low-k films in semiconductor manufacturing.
• Catalyst & Ligand Support: The functional silsesquioxane cage provides a robust, well-defined platform for supporting homogeneous catalysts and organometallic complexes.
• Additive Manufacturing: Incorporated into photopolymer resins for 3D printing to improve the thermal and mechanical properties of printed parts.
• Adhesives & Sealants: Imparts improved heat resistance and dimensional stability to high-performance silicone-based adhesives and sealants.

Basic Information

Product Name	(Dimethylvinylsilyloxy)Heptacyclopentyl T8 Silsesquioxane
CAS No.	319910-53-7
Molecular Formula	C42H78O13Si9
Molecular Weight	1048.11 g/mol
Synonyms	Heptacyclopentyl(dimethylvinylsiloxy)silsesquioxane; (Dimethylvinylsiloxy)heptacyclopentyl-POSS; Vinyl-POSS Cage Mixture; POSS® Cage Mixture, (Dimethylvinylsiloxy)heptacyclopentyl substituted; Octasilsesquioxane, 1-(dimethylvinylsilyl)oxy-1,3,5,7,9,11,13-heptacyclopentyl-; T8-(C5H9)7(OSi(CH3)2CH=CH2); Hybrid Plastics POSS MA0735 (related trade material)
EINECS	Contact for details

Quality Control

Every batch of our (Dimethylvinylsilyloxy)Heptacyclopentyl T8 Silsesquioxane is manufactured and tested under a strict quality management system. We employ advanced analytical techniques including NMR (¹H, ²⁹Si), FT-IR, and HPLC/GPC to ensure chemical identity, purity, and consistency. A comprehensive Certificate of Analysis (COA) detailing batch-specific results is provided with each shipment, ensuring full traceability and compliance with your material specifications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). The product is moisture-sensitive (hygroscopic) and should be handled under an inert atmosphere (e.g., nitrogen or argon) when appropriate to prevent degradation.

Specification

Item	Specification
Appearance	White to off-white powder or crystalline solid
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 95% (Cage Mixture)
Loss on Drying	≤ 1.0 %
Residue on Ignition	Contact for details
Heavy Metals	< 10 ppm

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