CoolTherm® UR-388 Flame Retardant Urethane Encapsulant Where to Buy
Product Information
LORD CoolTherm® UR-388 encapsulant is a two-component urethane system designed for encapsulating and casting applications. CoolTherm UR-388 encapsulant cures at room temperature to produce a flame retardant, semi-flexible material.
Shelf Life
Shelf life of each component is six months from date of manufacture when stored at 25°C in original, unopened container. CoolTherm UR-388 resin container must be periodically inverted to prevent settling.
After opening, protect each component from exposure to moisture by using dry nitrogen as an inert cover.
If stored or shipped at cooler temperatures, CoolTherm UR-388 hardener may crystallize. If crystals appear, gently warm hardener at 30-50°C to melt crystals before mixing with resin. Limit heating period to less than three hours as excessive heating will cause dimerization.
Features and Benefits
Low Stress – exhibits low shrinkage and stress oncomponents as it cures.
Low Viscosity – maintains low viscosity for complete and void-free encapsulation.
Room Temperature Cure – suitable for curing at room temperature; may be mildly heat cured (60°C) to expedite cure.
Low Exotherm – exhibits low exothermic heat rise during room temperature cure.
Environmentally Resistant – provides excellent thermal shock resistance.
UL Rated – provides excellent flame retardancy; UL 94 V-0 certified.
Low Outgassing – exhibits low gassing properties in high vacuum environments.
Broad Temperature Range – can be used on parts and devices that experience operating temperatures from -55°C to +130°C.
Uncured Typical Properties*
| Mixed Appearance | Black Liquid |
| Mixed Viscosity, cps @ 25°C | 6000 |
| Mixed Specific Gravity | 1.47 |
| Working Life, min @ 25°C | 30 |
| Gel Time, min @ 25°C | 77 |
| Cure Time |
24 hr @ 25°C; or 6 hr @ 60°C |
Cured Typical Properties*
| Volume Resistivity, ohm-cm @ 25°C | 7 x 1015 |
| Thermal Conductivity, W/m·K | 0.7 |
| Hardness, Shore A | 90 |
| Tensile Strength, MPa (psi) | 15.58 (2260) |
| Elongation at Break, % | 50 |
| Dielectric Constant, @ 25°C | 6.2 |
| Dissipation Factor, @ 25°C | 0.013 |
| Outgassing, % |
Total Mass Loss (TML) = 0.32 Collected Volatile Condensable Materials (CVCM) = 0.02 |
*Data is typical and not to be used for specification purposes.
Literature
| Download | Type | Name | |
|---|---|---|---|
| Safety Data Sheet | CoolTherm UR-388 Resin | |
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| Safety Data Sheet | CoolTherm UR-388 Hardener | |
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Technical Data Sheet | CoolTherm UR-388 Flame Retardant Urethane Encapsulant | |
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Selector Guide | Electronic Materials for LED Applications |