Description

Polymethylhydrosiloxane (CAS NO 178873-19-3) is a versatile organosilicon polymer characterized by its reactive Si-H functional groups. This compound is a critical intermediate and functional additive, valued for its ability to undergo hydrosilylation reactions and modify surface properties. It is essential for manufacturers in the silicone, coatings, and specialty chemical industries seeking to enhance product performance, crosslink density, and hydrophobicity.

Application

• Silicone Crosslinking Agent: A key component in addition-cure (hydrosilylation) silicone systems for producing elastomers, gels, and resins.
• Surface Treatment & Waterproofing: Used to impart hydrophobic and oleophobic properties to textiles, paper, glass, and construction materials.
• Adhesive & Sealant Formulations: Acts as a crosslinker and adhesion promoter in high-performance silicone-based adhesives and sealants.
• Release Coatings: Employed in the formulation of non-stick and release coatings for pressure-sensitive labels and industrial molding.
• Polymer Modification: Serves as a reactive modifier for organic polymers to improve thermal stability, weather resistance, and surface characteristics.
• Intermediate for Specialty Silicones: A foundational building block for synthesizing custom silicone fluids, surfactants, and other functional siloxanes.

Basic Information

Product Name	Polymethylhydrosiloxane
CAS No.	178873-19-3
Molecular Formula	(C3H10OSi)n (Representative)
Molecular Weight	Varies by chain length (n)
Synonyms	PMHS; Methylhydrogen polysiloxane; Poly(methylhydro)siloxane; Methylhydrosiloxane polymer; Methylhydrogensiloxane-dimethylsiloxane copolymer; Hydride-terminated polydimethylsiloxane (specific grades); Hydrogenomethylsiloxane polymer; Siloxanes and Silicones, Me hydrogen
EINECS	Contact for details

Quality Control

Our Polymethylhydrosiloxane is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure consistent performance, including measurement of active hydrogen content, viscosity, and purity. Certificates of Analysis (COA) detailing key specifications are provided with every shipment to guarantee compliance with your formulation requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is easily oxidized; for long-term storage, maintaining an inert atmosphere (nitrogen or argon) is recommended to preserve reactivity. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Active Hydrogen Content	Contact for details
Viscosity (25°C)	Contact for details
Specific Gravity (25°C)	Contact for details
Refractive Index (n20D)	Contact for details
Volatile Matter	≤ 2.0%
Identification (IR)	Conforms

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