CoolTherm® UR-288 Flame Retardant Urethane Encapsulant Where to Buy
Product Information
LORD CoolTherm® UR-288 encapsulant is a two-component urethane system designed for encapsulating and casting applications. CoolTherm UR-288 encapsulant cures at room temperature to produce a flame retardant, semi-flexible material. This material meets UL 94 HB rating at 3.0 mm thickness when the 100:20 mix ratio is utilized.
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-288 resin container must be periodically inverted to prevent settling.
After opening, protect each component from excessive moisture by using dry nitrogen as an inert cover.
If stored or shipped at cooler temperatures, CoolTherm UR-288 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 on components 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 and flame retardancy.
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 Specific Gravity | 1.37 |
| Gel Time, min @ 25°C | 85 |
| Working Life, min @ 25°C | 30 |
| Cure Time |
24 hr @ 25°C; or 6 hr @ 60°C |
Cured Typical Properties*
| Volume Resistivity, ohm-cm @ 25°C |
100:20 Mix Ratio = >1 x 1015 100:12.5 Mix Ratio = >1 x 1015 |
| Thermal Conductivity, W/mK |
100:20 Mix Ratio = 0.4 100:12.5 Mix Ratio = 0.4 |
| Hardness |
100:20 Mix Ratio = 90 (Shore A); 35 (Shore D) 100:12.5 Mix Ratio = 50 (Shore A); 10 (Shore D) |
| Tensile Strength, psi |
100:20 Mix Ratio = 1204 100:12.5 Mix Ratio = 203 |
| Elongation at Break, % |
100:20 Mix Ratio = 45 100:12.5 Mix Ratio = 68 |
| Dielectric Constant, @ 25°C |
100:20 Mix Ratio = 3.3 100:12.5 Mix Ratio = 3.9 |
| Dissipation Factor, @ 25°C |
100:20 Mix Ratio = 0.013 100:12.5 Mix Ratio = 0.05 |
*Data is typical and not to be used for specification purposes.
Literature
| Download | Type | Name | |
|---|---|---|---|
| Safety Data Sheet | COOLTHERM UR-288 RESIN | |
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| Safety Data Sheet | CoolTherm UR-288 Hardener | |
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Product Catalog | Potting & Encapsulation Materials | |
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Technical Data Sheet | CoolTherm UR-288 Flame Retardant Urethane Encapsulant |
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