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	Original Value	Comments

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

Mechanical Properties	Original Value	Comments
Hardness, Shore A	90	ASTM D 2240
Tensile Strength	2260 psi	ASTM D 638
Elongation at Break	50 %	ASTM D 638

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

Thermal Properties	Original Value	Comments
Thermal Conductivity	0.700 W/m-K
Maximum Service Temperature, Air	130 °C
Minimum Service Temperature, Air	-55.0 °C
Flammability, UL94	V-0

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

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

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PLORD9343 / 232699

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