Description

Octamethylsilsesquioxane is a well-defined, cage-structured organosilicon compound, also known as a polyhedral oligomeric silsesquioxane (POSS). This high-purity chemical serves as a critical building block and performance additive, offering a unique combination of organic compatibility and inorganic silica-like properties. It is essential for manufacturers in the advanced materials, electronics, and specialty chemical sectors seeking to enhance thermal stability, mechanical strength, and processing characteristics.

Application

• Advanced Polymer Composites: Acts as a nanoscale reinforcing agent to improve thermal stability, mechanical strength, and flame retardancy in engineering plastics, silicones, and epoxy resins.
• Specialty Coatings & Films: Used to formulate high-performance, scratch-resistant, and low-dielectric constant coatings for electronic components and optical films.
• Electronics Encapsulation: Serves as a precursor or additive in semiconductor packaging materials and dielectric layers due to its excellent insulating properties and thermal resistance.
• Personal Care & Cosmetics: Functions as a film-forming agent and texturizer in hair care, skincare, and color cosmetics for improved feel and durability.
• Adhesives & Sealants: Enhances the thermal and chemical resistance of high-performance silicone and hybrid polymer adhesives.
• Catalyst & Ligand Support: Utilized as a robust, well-defined platform for supporting homogeneous catalysts in specialized organic synthesis.
• Pharmaceutical Intermediates: Employed in the synthesis of sophisticated drug delivery systems and bioactive molecules.

Basic Information

Product Name	Octamethylsilsesquioxane
CAS No.	17865-85-9
Molecular Formula	C8H24O12Si8
Molecular Weight	536.93 g/mol
Synonyms	Octakis(dimethylsiloxy)silsesquioxane; Octa(dimethylsiloxy)silsesquioxane; POSS Cage Mixture, Methyl; T8 Methyl Silsesquioxane; Methyl T8 POSS; Polyhedral Oligomeric Silsesquioxane, Methyl; Q8M8; 2,2,4,4,6,6,8,8,10,10,12,12,14,14,16,16-Hexadecamethyl-1,3,5,7,9,11,13,15-octaoxa-2,4,6,8,10,12,14,16-octasilacyclohexadecane
EINECS	241-823-1

Quality Control

Our Octamethylsilsesquioxane is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including chromatography and spectroscopy, to ensure high purity and consistent performance. Certificates of Analysis (COA) detailing purity, identity, and key physical parameters are provided with every shipment to support your quality assurance protocols.

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 away from strong acids, bases, and oxidizing agents. The product is moisture-sensitive; ensure containers are sealed after use to prevent degradation.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0% (T8 Cage)
Melting Point	150 - 170 °C
Loss on Drying	≤ 0.5 %
Residue on Ignition	≤ 0.1 %

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