Product name: Hydroxy vinyl silicone fluid

Alias: Silanol Terminated methyl vinyl silicone fluid

Product code: NV-SIOH204

Chemical Informations:

Main Composition:Siloxanes and Silicones, di-Me, Me vinyl, hydroxy-terminated (Hydroxy-terminated polydimethylvinylsiloxane)

Molecular Structure:HO-[Si(CH3)2-O]-[Si(CH3)(CH=CH2)-O]-H

Cas No.:67923-19-7

Chemical Character: NV-SIOH204 is a low-viscosity, reactive silicone fluid featuring both terminal hydroxyl groups (silanol) and vinyl functional groups along the polydimethylsiloxane (PDMS) backbone. .

Product Description:

NV-SIOH204 is a low-viscosity, hydroxyl-terminated methyl vinyl silicone fluid containing reactive silanol groups at both molecular chain ends and controlled vinyl functionality along the polysiloxane backbone.

The terminal silanol groups provide strong interaction with inorganic fillers, especially precipitated silica and fumed silica, improving filler dispersion and reducing silica-induced structure build-up ("crepe hardening") during silicone rubber processing.

The vinyl groups provide additional reactive sites for platinum-catalyzed hydrosilylation reactions, allowing NV-SIOH204 to participate in silicone network formation and modify crosslink density, mechanical properties, and processing characteristics.

Due to its dual-functional molecular structure, NV-SIOH204 is suitable as a multifunctional additive for HTV silicone rubber, liquid silicone rubber (LSR), silicone sealants, and silicone-modified polymer systems.

Typical properties:

Appearance:Colorless transparent liquid

Viscosity (25℃, mm²/s): 30-40

Hydroxyl Content (wt%)≥5.5%

Vinyl Content (wt%):6.0-7.0%

Water Content (wt%)≤0.5%

Key Benefits & Features

Excellent Structure Control Effect

The silanol groups interact with hydroxyl groups on silica surfaces, reducing filler-filler interaction and minimizing storage hardening of silicone compounds.

Benefits:

Improved compound processability

Reduced mixing torque

Better filler dispersion

Extended storage stability

Dual Functional Reactivity

NV-SIOH204 combines:
Silanol groups (-SiOH) for filler interaction and condensation reactions
Vinyl groups (-CH=CH₂) for addition-cure silicone networks

This enables simultaneous improvement of processing performance and cured material properties.

Low Viscosity and Easy Incorporation

With low viscosity, NV-SIOH204 provides:
Fast wetting of fillers;
Easy blending into silicone compounds;
Reduced processing energy requirements

Reactive Modification Capability

Unlike conventional silicone oils, NV-SIOH204 can chemically participate in silicone network formation, reducing migration and improving compatibility compared with non-reactive silicone plasticizers.

HTV Silicone Rubber Structure Control Agent
NV-SIOH204 is recommended as a multifunctional additive for high consistency silicone rubber compounds.
Functions include:
Improves silica dispersion;
Reduces crepe hardening during storage;
Enhances processing stability;
Adjusts cured rubber network characteristics.
Typical dosage: 2–8 phr depending on silica loading and compound formulation.
Liquid Silicone Rubber (LSR) Modifier
In addition-cure LSR systems, NV-SIOH204 can function as:
Reactive viscosity modifier; 
Filler compatibility enhancer; 
Network structure regulator; 
Advantages include:
Improved filler wetting;
Reduced compound viscosity; 
Better balance of hardness and elasticity.
Liquid Silicone Rubber (LSR) Modifier
In addition-cure LSR systems, NV-SIOH204 can function as:
Reactive viscosity modifier;
Filler compatibility enhancer;
Network structure regulator.
Advantages include:
Improved filler wetting;
Reduced compound viscosity;
Better balance of hardness and elasticity .
Filler Treatment and Silicone Resin Modification
NV-SIOH204 can improve the compatibility between silicone polymers and inorganic materials such as:silica ,mineral fillers ,glass fibers ,ceramic fillers.
It can also be used as a reactive intermediate for silicone-modified resin systems.

Processing Recommendations
NV-SIOH204 can be added during silicone compound mixing together with base polymer and fillers.
Recommended sequence:
1.Add silicone polymer 
2.Add silica filler 
3.Add NV-SIOH204 
4.Mix until uniform dispersion is achieved 
Compatible with:
Hydroxy silicone oils 
Vinyl silicone oils 
Silicone gums 
LSR base polymers

Packaging

25 kg Plastic pails;200 kg Iron or plastic drum; 1000 kg IBC Totes