Description

Polymethylhydrosiloxane is a reactive organosilicon polymer featuring Si-H functional groups along its backbone. This chemical structure makes it a versatile intermediate and cross-linking agent critical for modifying material properties. It is essential for manufacturers in the silicone, coatings, and adhesives industries seeking to enhance product performance, durability, and hydrophobicity. Its reactive hydride groups enable key transformations in the synthesis of advanced silicone materials.

Application

• As a key cross-linking agent in the production of silicone elastomers, rubbers, and high-consistency rubber (HCR).
• As a reactive intermediate for the synthesis of modified siloxanes and specialty silicone fluids.
• In the formulation of release coatings and pressure-sensitive adhesives (PSAs).
• As a water repellent and surface treatment agent for textiles, paper, and construction materials.
• For foam control and as a defoamer component in industrial processes.
• In the production of silicone resins used for high-temperature resistant coatings and electrical insulation.
• As a hydrosilylation reactant to graft organic functionalities onto silicone polymers.

Basic Information

Product Name	Polymethylhydrosiloxane
CAS No.	9004-73-3
Molecular Formula	(C3H10OSi)n or [CH3HSiO]n
Molecular Weight	Varies (Polymer)
Synonyms	PMHS; Methylhydrogen polysiloxane; Poly(methylsiloxane), methylhydrogen-terminated; Methylhydrosiloxane polymer; Methylhydrogen silicone fluid; Hydride-terminated polydimethylsiloxane (when specific); Hydrogenomethylsilyloxy-dimethylsilyloxy copolymer; 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 consistency in key parameters such as active hydrogen content, viscosity, and purity. Certificates of Analysis (COA) documenting these specifications are available upon request to support your quality assurance and regulatory compliance needs.

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). Keep the container tightly sealed when not in use to prevent contact with atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms
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

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