Lord Adhesives CoolTherm™ UR-388 Flame Retardant Urethane Encapsulant System

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Lord Adhesives CoolTherm™ UR-388 Flame Retardant Urethane Encapsulant System
Categories:	Polymer; Thermoset; Polyurethane, TS; Thermoset Polyurethane, Adhesive
Material Notes:	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. Features: exhibits low shrinkage and stress on components as it cures. maintains low viscosity for complete and void-free encapsulation. suitable for curing at room temperature; may be mildly heat cured (60°C) to expedite cure. exhibits low exothermic heat rise during room temperature cure. Provides excellent thermal shock resistance. provides excellent flame retardancy; UL 94 V-0 certified. exhibits low gassing properties in high vacuum environments. can be used on parts and devices that experience operating temperatures from -55°C to +130°C. All information provided by Lord.
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Physical Properties	Metric	English	Comments

Specific Gravity	1.24 g/cc	1.24 g/cc	UR-388 Hardener
	1.47 g/cc	1.47 g/cc	Mixed
	1.53 g/cc	1.53 g/cc	UR-388 Resin
Viscosity	70 cP @Temperature 25.0 °C	70 cP @Temperature 77.0 °F	UR-388 Hardener
	6000 cP @Temperature 25.0 °C	6000 cP @Temperature 77.0 °F	Mixed
	15000 cP @Temperature 25.0 °C	15000 cP @Temperature 77.0 °F	UR-388 Resin
Outgassing - Total Mass Loss	0.32 %	0.32 %	ASTM E 595-77
Collected Volatile Condensable Material	0.020 %	0.020 %	ASTM E 595-77

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	90	90	ASTM D 2240
Tensile Strength	15.6 MPa	2260 psi	ASTM D 638
Elongation at Break	50 %	50 %	ASTM D 638

Electrical Properties	Metric	English	Comments
Volume Resistivity	7.00e+15 ohm-cm @Temperature 25.0 °C	7.00e+15 ohm-cm @Temperature 77.0 °F	ASTM D 257
Dielectric Constant	1.51 @Frequency 60.0 Hz, Temperature 25.0 °C	1.51 @Frequency 60.0 Hz, Temperature 77.0 °F	ASTM D 150
Dissipation Factor	0.013 @Frequency 60 Hz, Temperature 25.0 °C	0.013 @Frequency 60 Hz, Temperature 77.0 °F	ASTM D 150

Thermal Properties	Metric	English	Comments
Thermal Conductivity	0.700 W/m-K	4.86 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air	130 °C	266 °F
Minimum Service Temperature, Air	-55.0 °C	-67.0 °F
Flammability, UL94	V-0	V-0

Processing Properties	Metric	English	Comments
Working Life	30.0 min @Temperature 25.0 °C	30.0 min @Temperature 77.0 °F
Gel Time	77.0 min @Temperature 25.0 °C	77.0 min @Temperature 77.0 °F	mixed
Shelf Life	6.00 Month @Temperature 25.0 °C	6.00 Month @Temperature 77.0 °F	from date of manufacture in original, unopened container

Descriptive Properties
Appearance	Amber Liquid		UR-388 Hardener
	Black Liquid		UR-388 Resin
	Black Liquid		Mixed

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

PLORD9343 / 232699

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