Henkel Loctite® Stycast® U 2500 HTR Two-Component Polyurethane Encapsulant

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Henkel Loctite® Stycast® U 2500 HTR Two-Component Polyurethane Encapsulant
Categories:	Polymer; Thermoplastic; Polyurethane, TP
Material Notes:	Loctite Stycast U 2500 HTR provides the following product characteristics: Low viscosity Low modulus High temperature resistance Excellent wetting properties Cure: Room Temperature or Heat Cure Application: Potting, Encapsulant Typical Assembly Applications: Transformers, PCB's and other insulating applications Loctite Stycast U 2500 HTR flexible polyurethane encapsulant is formulated to have low viscosity and excellent wetting properties allowing complete impregnation of either small slightly wound coils or large castings. It can also be used to replace silicones. Loctite Stycast U 2500 HTR has a higher service temperature than standard polyurethane materials. Information provided by Henkel.
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Physical Properties	Original Value	Comments

Density	1.23 g/cc	Part B
	1.42 g/cc	Part A
Moisture Absorption	0.600 % @Temperature 24.0 °C, Time 86400 sec
	0.600 % @Temperature 100 °C, Time 3600 sec
Viscosity	5.0 cP	Part B
	8000 cP	Mixed
	12500 cP	Part A

Mechanical Properties	Original Value	Comments
Hardness, Shore A	75
Tensile Strength	4.00 MPa
Elongation at Break	66 %
Modulus of Elasticity	0.0100 GPa
Adhesive Bond Strength	6.00 MPa	Lap Shear Strength, Al to Al

Electrical Properties	Original Value	Comments
Volume Resistivity	1.70e+12 ohm-cm	500 Volts
Surface Resistance	1.90e+13 ohm
Dielectric Constant	6.0 @Frequency 1e+6 Hz
	7.0 @Frequency 50 Hz
	7.1 @Frequency 1000 Hz
Dissipation Factor	0.030 @Frequency 1000 Hz
	0.050 @Frequency 50 Hz
	0.050 @Frequency 1e+6 Hz

Thermal Properties	Original Value	Comments
CTE, linear	134 µm/m-°C @Temperature >=-50.0 °C	Above Tg
Maximum Service Temperature, Air	150 °C
Minimum Service Temperature, Air	-40.0 °C
Glass Transition Temp, Tg	-50.0 °C

Processing Properties	Original Value	Comments
Cure Time	4.00 hour @Temperature 60.0 °C	Option 2, Post Cure: 2 hours @ 100 to 120°C
	24.0 hour @Temperature 25.0 °C	Option 1, Post Cure: 2 hours @ 100 to 120°C
Pot Life	240 min
Shelf Life	6.00 Month

Descriptive Properties
Appearance	Amber	Component B, Hardener
	Black	Component A, Resin
Mix Ratio, by Weight	100 : 7.6	Component A : Component B

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PHENK7962 / 255446

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