Description

Polyethylhydrosiloxane CAS NO 24979-95-1 is a reactive organosilicon polymer featuring a backbone of alternating silicon and oxygen atoms with ethyl and hydrogen substituents. This unique structure provides it with versatile reactivity, particularly through its Si-H bonds, making it a valuable intermediate and modifier in advanced material synthesis. It is essential for manufacturers in the silicone, coatings, and specialty polymer industries seeking to enhance material properties such as cross-linking density, hydrophobicity, and thermal stability. Its functionality enables precise tailoring of final product performance for demanding applications.

Application

• Cross-linking Agent: Used as an active cross-linker in addition-cure silicone rubber (HTV and RTV) and resin systems.
• Surface Modification: Imparts hydrophobic and release properties to surfaces in textile, paper, and construction material treatments.
• Intermediate for Silicone Fluids: Serves as a key precursor in the synthesis of modified silicone oils and emulsions.
• Adhesive & Sealant Formulation: Enhances adhesion and curing characteristics in high-performance sealants and adhesives.
• Polymer Modification: Used to graft silicone properties onto organic polymers, improving their weatherability and lubricity.
• Hydrophobic Coatings: A critical component in formulations for water-repellent coatings on electronics, optics, and automotive parts.

Basic Information

Product Name	Polyethylhydrosiloxane
CAS No.	24979-95-1
Molecular Formula	(C2H6OSi)n • (C2H4HSiO)m
Molecular Weight	Variable (Polymer)
Synonyms	Poly(ethylhydro)siloxane; Ethylhydrogen polysiloxane; Poly(ethylhydro)siloxane fluid; Ethylhydrogen silicone oil; Poly(ethylhydro)siloxane polymer; Poly(ethylhydro)siloxane resin; Ethylhydrogen silicone fluid; Poly(ethylhydro)siloxane oil
EINECS	Contact for details

Quality Control

Our Polyethylhydrosiloxane is manufactured under strict quality management protocols. Each batch undergoes rigorous analytical testing to ensure consistent performance, including determination of active hydrogen content, viscosity, and purity. A comprehensive Certificate of Analysis (COA) detailing all specifications is provided with every shipment to guarantee compliance with your technical requirements and support your quality assurance processes.

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) and easily oxidized; it is recommended to store under an inert atmosphere (e.g., nitrogen or argon) to maintain stability and prevent degradation. Keep away from heat, sparks, open flames, and incompatible materials such as strong oxidizers and bases.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms
Active Hydrogen Content	0.8 - 1.2% (w/w)
Viscosity (25°C)	10 - 1000 cSt (Typical)
Specific Gravity (25°C)	0.95 - 1.05
Refractive Index (n20D)	1.40 - 1.43
Water Content	< 0.1%

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