Product Name:Ultra-High Viscosity Silanol Fluid (1M-20m cSt)

Chemical Information

Main Composition:Hydroxy terminated polydimethylsiloxane

Molecular Structure:HO-Si(CH3)2O[-Si(CH3)2O-]nSi (CH2)-OH

Cas No.:70131-67-8

Features: Extremely high molecular weight, similar to solids or extremely viscous fluids, providing high strength.

Typical specifications:

Appearances:colorless transparent highly viscous semisolid

Key Features & Benefits

Superior Mechanical Integrity: High molecular weight provides the backbone for intermolecular cross-linking, delivering high tensile strength, elasticity, and durability after curing.

High Elasticity & Low Compression Set: Ensures excellent elasticity and recovery (low compression set) for sealing applications requiring long-term shape retention.

Long-Chain Flexibility: Imparts excellent low-temperature flexibility and high-temperature stability to the finished product.

Optimized Cohesion: Enhances the cohesive strength of coatings and sealants on various hard surfaces.

Consistent Viscosity & Processability: Narrow molecular weight distribution ensures predictable extrusion rates, reliable handling, and consistent formulation behavior.

Reactive Functionality: Hydroxy-terminated structure provides crosslinking capability for RTV elastomers, sealants, and FIPG gaskets. In damping and masterbatch applications where no crosslinker is added, the product functions as an ultra-high molecular weight linear polymer with hydroxyl groups remaining dormant.

Applications:

High-Strength Elastomers: Base polymer for condensation-cure RTV rubbers with superior tensile and tear strength

Structural Adhesives: Base material for heavy-duty industrial bonding and structural glazing, providing high cohesive strength and long-term UV/weather resistance.

Silicone Gaskets (FIPG): Formulating Formed-in-Place Gaskets for automotive engines and transmissions, leveraging high-viscosity base polymers.

Damping & Vibration Control: Used as high-viscosity vibration damping fluids, mechanical shock absorbers, and specialty damping fluids for mechanical components.[Non-reactive – no crosslinker added; functions as linear polymer]

Silicone Masterbatches: Used as a carrier or dispersion oil for high-loading silicone masterbatch production.[Reactivity optional – depends on formulation]

Specialty Coatings: High-build elastic membranes for roof waterproofing, tank linings, and bridge protection. Ultra-high viscosity (≥10M cSt) enables solventless, high-solids formulations.

Precision Mold Making: Base material for low-shrinkage (<0.1%), high-tear-strength mold rubbers for prototypes, jewelry, and micro-component replication.

Electronic Encapsulation (Heavy-Duty): Potting compounds for high-power modules and outdoor electronic assemblies requiring robust mechanical protection and low shrinkage.

Handling Guide:

Products≥5,000,000 cSt require special handling. Pre-heating to 60-80°C is recommended for pumping and mixing;

Grades ≥10,000,000 cSt are best processed using kneaders, planetary mixers, or twin-screw compounding equipment.

Blending with lower-viscosity grades of the same chemistry is an alternative approach.