Description

Poly(Methylsilsesquioxane) is a high-performance organosilicon polymer characterized by a cage-like structure, offering a unique combination of thermal stability, low dielectric constant, and excellent optical clarity. This compound matters for its ability to enhance material properties, providing superior heat resistance and mechanical strength in demanding environments. It is essential for manufacturers in the electronics, aerospace, and advanced coatings industries seeking to improve product durability and performance.

Application

• As a key dielectric material in semiconductor manufacturing and microelectronic packaging.
• As a heat-resistant binder or additive in high-temperature protective coatings and paints.
• As a reinforcing filler in silicone rubber and other elastomers to improve mechanical properties.
• In the formulation of optical films and lenses due to its high transparency and refractive index.
• As a surface modifier to impart water repellency and release properties to various substrates.
• For the synthesis of hybrid organic-inorganic materials (ORMOSILs) with tailored properties.
• In aerospace composites to enhance thermal and oxidative stability.

Basic Information

Product Name	Poly(Methylsilsesquioxane)
CAS No.	68554-70-1
Molecular Formula	(CH3SiO1.5)n
Molecular Weight	Variable (Polymer)
Synonyms	Methylsilsesquioxane resin; PMSQ; Polymethylsilsesquioxane; Methyl T-resin; Tospearl® (trade name variant); Silicone resin T-resin; Poly(methylsiloxane); (Methylsiloxane)(methylsilsesquioxane) copolymer
EINECS	Contact for details

Quality Control

Our Poly(Methylsilsesquioxane) is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistency and compliance with agreed specifications. Comprehensive Certificates of Analysis (COA) detailing purity, molecular weight distribution, and key physical properties are available upon request to support your quality assurance protocols.

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); containers must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	White to off-white powder or granules
Identification (IR)	Conforms to structure
Assay (as SiO2)	≥ 98.0 %
Loss on Drying	≤ 2.0 %
Heavy Metals (as Pb)	≤ 10 ppm
Molecular Weight (Mw)	Specified range available
Refractive Index (n20D)	~1.39 - 1.42

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