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Silico® Mercapto Functional Silicone Fluids

Mercapto-functional silicone fluids (–SH terminated or pendant) are specialty reactive silicones featuring thiol groups that enable chemical bonding with various substrates. These fluids offer excellent surface reactivity, thermal stability, and compatibility in a wide range of industrial applications, including release agents, UV-curable coatings, and surface modification technologies.

Applications of Mercapto Silicone Fluids

Mercapto-functional silicones are widely used in the following applications due to their high surface activity and reactivity:

Release agents for rubber, plastic, and metal molding
Enhance demolding performance under extreme temperatures and pressures.
Corrosion-resistant coatings for metals
Thiol groups chemically bond to metallic surfaces, improving durability and barrier properties.
UV/EB curable coatings and adhesives
React via free radical chemistry to enhance adhesion and crosslink density.
Organic–inorganic hybrid synthesis
Serve as intermediates for grafting thiol groups onto polysiloxanes or organic polymers.
Textile and fiber treatment
Improve softness, antistatic behavior, and surface energy of synthetic and natural fibers.

Recommended Vinyl Silicone Oils

SC-367 Mercapto Silicone Fluid | SH-Functional

SC-367 is a reactive silicone fluid with –SH groups on a siloxane backbone. With ~150 cP viscosity and 5.4% thiol content, it offers strong adhesion, reactivity, and release for coatings, UV systems, and surface treatments.

SC-71-SS Mercapto Silicone Fluid | Low SH

SC-71-SS is a low-thiol silicone fluid (~100 cP, ~1.0 wt% –SH) designed for controlled reactivity in surface treatments and polymer systems, enabling precise tuning of crosslinking, adhesion, and compatibility.

SC-800 Mercapto Functional Silicone Fluid

SC-800 is a mercapto-functional silicone fluid (~200 cP, 2% thiol) with –SH groups on a siloxane backbone. It provides strong reactivity, adhesion, and release for coatings, UV systems, and surface treatments.

SC-710 Mercapto Functional Silicone Fluid

SC-710 is a high-viscosity mercapto silicone fluid (~32,000 cP, 0.28% –SH) with mercaptopropyl groups on a PDMS backbone. It offers strong reactivity, adhesion, and release for coatings, rubber, polymers, and UV.

SC-SiF2060 Mercapto Silicone Fluid

SC-SiF2060 (CAS 101810-99-5 / 102783-03-9) is a mercaptopropyl methylsiloxane–dimethylsiloxane copolymer with 3–4% adjustable thiol content, designed for high-performance applications needing reactivity, release, and heat resistance.

SMS Series Mercapto Silicone Fluids

SMS-022, 042, 142, 992 (CAS 102783-03-9) are specialty intermediates with 2–17% thiol content. They are used in high-performance electronic connectors, ensuring reliable quality for the electronics and pharmaceutical industries.

Mercaptopropyl-Terminated PDMS

Mercaptopropyl-Terminated Polydimethylsiloxane (CAS 308072-58-4) is a reactive silicone polymer with terminal –SH groups, used widely in coatings, adhesives, sealants, personal care, and electronics.

Packaging Specifications

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How to Choose Mercapto Functional Silicone Fluids ?

When selecting mercapto silicone fluids, consider the following key factors to optimize performance for your formulation or process:

Viscosity: Influences coating uniformity and processability. Low-viscosity grades are suited for surface treatment and coatings, while high-viscosity options benefit structural applications.
Thiol Content (–SH%): Determines reactivity. Higher SH% offers faster curing and stronger bonding.
Molecular Weight: Affects mechanical strength, film-forming ability, and thermal stability.
Solubility & Compatibility: Ensure compatibility with solvents, polymers, or substrate materials in your formulation.