CoolTherm® EP-3500 Thermally Conductive Epoxy Encapsulant Contact Us to Buy
LORD CoolTherm® EP-3500 encapsulant is a two-component epoxy system designed for encapsulation of motor stators, transformer coils, and devices requiring a rigid, high thermal conductivity material with a low coefficient of thermal expansion. CoolTherm EP-3500 encapsulant provides high-temperature stability combined with excellent electrical insulation.
Shelf life of each component is six months when stored at 25°C in original, unopened container. CoolTherm EP-3500 resin must be periodically rotated within its container to maintain maximum shelf life. Settling will occur if not mixed.
Features and Benefits
Superior Heat Dissipation – typically provides 30-50°C lower motor end winding temperatures during high-power operation.
Low Viscosity – provides low viscosity for a highly-filled material; self-levels to fill voids in motor stators/rotors, transformer coils and other electrical devices.
Durable– cured material resists cracking during multiple thermal cycles from sub-zero temperatures to 200°C.
Uncured Typical Properties*
|Mixed Appearance||Dark Gray Paste|
Mixed Viscosity, cP @ 60°C
Shear rate 10/s
|Mixed Specific Gravity, @ 25°C||2.98|
|Gel Time, min @ 110°C||73|
|Working Life, hr @ 60°C||>3|
Staged cure: 2 hr each @ 120°C, 150°C, 180°C & 210°C;
or by using a slow heating ramp to 210°C
Cured Typical Properties*
|Thermal Conductivity, W/m·K||3.3|
|Coefficient of Linear Thermal Expansion, ppm/°C||10.4|
|Glass Transition Temperature (Tg), °C||206|
|Hardness, Shore D||90|
|Young's Modulus, GPa||20|
|Volume Resistivity, ohm-cm @ 25°C||1 x 1014|
|Dielectric Strength, kV/mm (V/mil)||15.4 (390)|
* Data is typical and not to be used for specification purposes.
Cure schedule of 2 hours each at 120°C, 150°C, 180°C and 210°C.