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TSE387
GIS20965
SNAPSIL™ TSE387 – Neutral-Cure, Flowable Silicone Adhesive Sealant for Industrial and Electrical Applications
SNAPSIL™ TSE387 is a one-component, ready-to-use, flowable silicone adhesive sealant that cures at room temperature upon exposure to atmospheric moisture, forming a flexible, elastic silicone rubber with excellent adhesion and electrical insulation properties. Unlike acetoxy-cure silicones, TSE387 utilises an oxime-based neutral cure system, making it non-corrosive to copper and other sensitive metals, ideal for electrical assemblies, industrial enclosures, and environments where long-term material compatibility is critical.
With a flowable consistency (60 Pa·s) and extended tack-free time of 90 minutes, TSE387 is well-suited for applications requiring self-levelling coverage, thin-section potting, or filling of intricate geometries. It bonds primerlessly to metals, glass, ceramics, and many plastics, simplifying processing while delivering reliable protection against moisture, dust, ozone, and environmental stress.
Key Features
- Neutral oxime cure chemistry – non-corrosive to copper, brass, and other sensitive metals
- Flowable consistency – self-levels to coat complex shapes and penetrate tight spaces
- Wide service temperature range: –55°C to 200°C (–67°F to 392°F)
- Excellent electrical insulation:
- Dielectric strength: 20 kV/mm
- Volume resistivity: 1.0 × 10¹⁵ Ω·cm
- Primerless adhesion to a broad range of substrates
- Excellent weatherability, ozone resistance, and UV stability
- Available in translucent, black, and white for visual or aesthetic requirements
Typical Applications
- Thin-section potting and encapsulation of electrical components
- Sealing of industrial control housings, sensor modules, and power units
- Protective coating for PCBs and electronic assemblies requiring copper compatibility
- General-purpose bonding of metal, glass, ceramic, and engineered plastics
Technical Notes
- Tensile strength: 2.3 MPa (335 psi)
- Elongation: 350% – provides flexibility under thermal cycling
- Cured hardness: 25 Shore A
- Adhesive strength (aluminium lap shear): 1.3 MPa
- Tack-free time: 90 minutes at 23°C / 50% RH
- Full cure (3 mm): ~7 days at room temperature
- Maximum recommended thickness: 6 mm (¼ in.)
Certifications & Compliance
- Meets electronics industry standards for non-corrosive sealants
- UL Recognised under Component Recognition Program (File No. E-36952)
Packaging Options
- Available in caulking cartridges and bulk containers, with Translucent, Black, and White options (subject to availability)
Processing Recommendations
- Apply to clean, dry surfaces, no primer required for most substrates
- Ideal for pour, dip, or automated dispensing due to its flowable nature
- Ensure ambient humidity (>25% RH) for optimal cure
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SNAPSIL™ TSE387 – Neutral-Cure, Flowable Silicone Adhesive Sealant for Industrial and Electrical Applications
SNAPSIL™ TSE387 is a one-component, ready-to-use, flowable silicone adhesive sealant that cures at room temperature upon exposure to atmospheric moisture, forming a flexible, elastic silicone rubber with excellent adhesion and electrical insulation properties. Unlike acetoxy-cure silicones, TSE387 utilises an oxime-based neutral cure system, making it non-corrosive to copper and other sensitive metals, ideal for electrical assemblies, industrial enclosures, and environments where long-term material compatibility is critical.
With a flowable consistency (60 Pa·s) and extended tack-free time of 90 minutes, TSE387 is well-suited for applications requiring self-levelling coverage, thin-section potting, or filling of intricate geometries. It bonds primerlessly to metals, glass, ceramics, and many plastics, simplifying processing while delivering reliable protection against moisture, dust, ozone, and environmental stress.