Momentive TSE3975-C 300ml Clear Low-Volatile Silicone Adhesive Sealant for PCB and Electronic Components

Momentive TSE3975-C Silicone Sealant 300ml is a clear, one-component, low-volatile silicone adhesive sealant designed for electrical and electronic equipment, PCB assemblies, waterproof sealing and general industrial bonding. Its alcohol-type moisture-cure system provides fast surface curing, excellent electrical insulation and non-corrosive adhesion to metals including copper.

Product Overview

Momentive TSE3975-C is part of the TSE39X low-volatile silicone adhesive and sealant series.

The formulation reacts with moisture in the atmosphere and cures at room temperature to form a flexible silicone rubber with excellent heat resistance, cold resistance, electrical insulation, weather resistance and water resistance.

TSE3975 is a flowable grade, making it especially useful for areas where the silicone must penetrate narrow gaps, spread around components or provide a relatively thin protective layer.

The C suffix identifies the clear or translucent version.

Compared with conventional silicone materials, the TSE3975 series is designed with reduced low-molecular-weight siloxane content, making it particularly attractive for sensitive electrical and electronic applications.

Key Features and Advantages

Reduced Low-Molecular-Weight Siloxanes

One of the major advantages of TSE3975 is its low-volatile formulation.

Momentive lists the typical D3-D10 low-molecular-weight siloxane content at approximately 0.028%.

Reducing volatile silicone species can be important in precision electronics, electrical contacts and other applications where silicone contamination must be controlled.

Fast Surface Cure

Momentive TSE3975-C Silicone Sealant 300ml has a typical tack-free time of approximately 10 minutes at 23°C.

This relatively fast surface cure can help improve manufacturing efficiency during component bonding, sealing and protective coating operations.

Non-Corrosive to Metals

The alcohol-type cure system is designed to be non-corrosive to metal substrates, including copper-containing metals.

Momentive states that the material passes the MIL-A-46146B corrosion test.

This makes it more suitable for sensitive electronic assemblies than acidic silicone systems.

Flowable Consistency

TSE3975 has a typical viscosity of approximately 33 Pa·s at 23°C.

Its flowable consistency allows the material to enter small gaps and spread around electronic components, making it useful for sealing, thin potting and coating applications.

Excellent Electrical Insulation

The cured silicone provides strong dielectric properties.

Typical volume resistivity is approximately 2.0 × 10¹⁵ Ω·cm, while dielectric strength is approximately 23 kV/mm.

These characteristics make TSE3975 suitable for insulation and protection of electrical and electronic components.

Flexible Silicone Rubber

After curing for seven days at 23°C and 50% relative humidity, the material has a typical Shore A hardness of approximately 25.

Typical elongation at break is approximately 220%, allowing the cured silicone to absorb vibration, thermal movement and mechanical stress.

Applications of Momentive TSE3975-C Silicone Sealant 300ml

PCB and Electronic Components

TSE3975-C is suitable for bonding, sealing and protecting printed circuit boards and electronic components.

Its non-corrosive cure system makes it particularly useful around copper-containing components.

Hybrid IC Potting

Momentive specifically lists hybrid IC and printed circuit board potting and coating among the recommended applications.

Waterproof and Airtight Sealing

The cured silicone provides excellent water resistance and weather resistance, making the product suitable for waterproofing and airtight sealing of electrical equipment.

Protective Coating

The flowable consistency makes TSE3975-C suitable for selected coating applications where the material needs to spread over components or irregular surfaces.

Metal and Plastic Bonding

Momentive TSE3975-C Silicone Sealant 300ml provides good adhesion to many metals and plastics.

Typical compatible materials include copper, steel, stainless steel, aluminum, acrylic, epoxy resin, polycarbonate, PBT, PPS, ABS and selected engineering plastics.

Glass and Ceramic Bonding

The product also provides good adhesion to glass and ceramic substrates, making it suitable for mixed-material industrial assemblies.

Material Compatibility

Typical materials showing good adhesion in Momentive testing include:

Copper
Steel
Stainless Steel
Aluminum
Brass
Acrylic Resin
Epoxy Resin
Polycarbonate
PBT
PPS
ABS
Glass
Ceramic
Silicone Rubber

Polypropylene, polyethylene and fluororesin may require special surface treatment or primer and should be tested before production use.

Technical Information

Brand: Momentive

Model: TSE3975-C

Series: TSE3975

Product Type: Silicone Adhesive Sealant

Capacity: 300ml

Color: Clear / Translucent

Form: Flowable Silicone

Curing System: One-Part Alcohol-Type Moisture Cure

Viscosity at 23°C: Approx. 33 Pa·s

Tack-Free Time at 23°C: Approx. 10 Minutes

Density at 23°C: Approx. 1.05 g/cm³

Hardness: Approx. Shore A 25

Tensile Strength: Approx. 1.2 MPa

Elongation at Break: Approx. 220%

Tensile Shear Adhesion Strength: Approx. 1.2 MPa

Volume Resistivity: Approx. 2.0 × 10¹⁵ Ω·cm

Dielectric Strength: Approx. 23 kV/mm

Dielectric Constant at 60Hz: Approx. 2.9

Dissipation Factor at 60Hz: Approx. 0.005

Thermal Conductivity: Approx. 0.21 W/m·K

Low Molecular Siloxanes D3-D10: Approx. 0.028%

Why Choose Momentive TSE3975-C Silicone Sealant 300ml

Momentive TSE3975-C Silicone Sealant 300ml is particularly suited to electronic applications that require a combination of low volatility, fast surface curing, non-corrosive chemistry and electrical insulation.

Its flowable consistency also provides an advantage for narrow gaps, coating and thin-section encapsulation where a non-flowing paste may be difficult to apply.

For PCB assemblies, hybrid ICs, electrical equipment and industrial components requiring flexible sealing and protection, TSE3975-C provides a specialized electronic-grade silicone solution.

Related Links

FUJI Product Page:
https://www.hk-fuji.com/product/momentive-tse3975-c-silicone-sealant-300ml/

Official Momentive Product Data:
https://www.momentive.com/content/dam/momentive/ja-jp/tds—