CoolTherm® ES-21 Epoxy Encapsulant
Product Information
CoolTherm® ES-21 encapsulant is a fast cure, one-component epoxy formulated for electronic grade encapsulating applications. Encapsulant is filled with a non-abrasive filler to provide long wear life of automatic dispensing equipment, and contains a fluorescent dye for detection of encapsulant under UV light.
Shelf Life
Shelf life is six months when stored at 5°C in original, unopened container. Do not store containers outdoors or in non-ventilated exterior structures. Store product away from heat sources such as ovens or hot plates. Elevated storage temperatures will shorten product’s shelf life.
Features and Benefits
Fast Cure – cures quickly at 125°C.
Low Shrinkage – offers minimal shrinkage when low cure temperatures are used.
UV Fluorescence - coated surface fluoresces when exposed to UV light source, permitting in-line inspection.
Uncured Typical Properties*
| Appearance | Black Liquid |
| Viscosity, cP @ 25°C | 35,000 |
| Specific Gravity | 1.59 |
| Gel Time, minutes @ 125°C | 12 |
Cured Typical Properties*
| Thermal Conductivity, W/m∙K | 0.5 |
| Coefficient of Linear Thermal Expansion, ppm/°C |
below Tg = 57 above Tg = 144 |
| Glass Transition Temperature (Tg), °C | 115 |
| Hardness, Shore D | 88 |
| Tensile Strength, MPa (psi) | 48.95 (7100) |
| Elongation at Break, % | 2.8 |
| Moisture Absorption, % | 0.08 |
| Volume Resistivity, ohm-cm @ 25°C | >1 x 1015 |
| Dielectric Constant, @ 25°C | 4.35 |
| Dissipation Factor, @ 25°C | 0.0033 |
*Data is typical and not to be used for specification purposes.
Cure schedule of one hour at 150˚C.
Literature
| Download | Type | Name | |
|---|---|---|---|
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Technical Data Sheet | CoolTherm ES-21 Epoxy Encapsulant | |
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User Instructions | Electronic Materials Handling Instructions (5°C Storage Temperature) |