DOWSIL™ RTV 3145 Silicone Rubber Adhesive/Sealant is a high-performance, one-part, room-temperature vulcanizing (RTV) silicone designed for applications that require a durable, flexible, and heat-resistant bond or seal. It's part of Dow’s industrial-grade silicones and is widely used in electronics, aerospace, automotive, and other demanding environments.
Key Features
One-part RTV silicone : cures at room temperature with atmospheric moisture
High strength & elongation : remains flexible and resists stress
Non-corrosive : neutral cure; safe for sensitive metals like copper
High-temperature resistance : continuous exposure up to 204°C (400°F); intermittent up to 260°C (500°F)
Excellent dielectric properties : ideal for electrical/electronic sealing
Low volatility : suitable for enclosed or sensitive environments
UL recognized : Flammability rated UL 94-V0
Typical Technical Properties
Property Value
Appearance Translucent paste
Cure System Neutral, moisture cure
Tack-free time (25°C, 50% RH) ~45–60 minutes
Full cure (3 mm @ 25°C) 24–72 hours
Durometer Hardness (Shore A) ~45
Tensile Strength ~4.5 MPa (650 psi)
Elongation at Break ~150%
Dielectric Strength ~20 kV/mm
Thermal Conductivity ~0.2 W/m=K
Operating Temperature Range - 55°C to +204°C
Applications
Sealing electronic modules and power supplies
Bonding and gasketing components in aerospace and automotive systems
Heat-resistant sealing in appliances or industrial machinery
Encapsulating sensitive components requiring electrical insulation
Shock and vibration damping in mechanical assemblies
Packaging Formats
* Cartridges (90 mL or 310 mL)
* Syringes (custom for electronics)
* Bulk packaging: 1 kg, 5 kg, or drums for industrial use
Handling & Safety
* Ensure adequate ventilation during use
* Avoid contact with uncured material on skin/eyes
* Clean surfaces thoroughly before application
* Store in a cool, dry place below 30°C
* Follow guidance in the official Safety Data Sheet (SDS)
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