Henkel Loctite® Stycast® US5544 Flexible Polyurethane Compound

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Henkel Loctite® Stycast® US5544 Flexible Polyurethane Compound
Categories:	Polymer; Thermoplastic; Polyurethane, TP
Material Notes:	US5544 is a fast gelling, flexible, flame-retardant, mineral-filled, polyurethane compound. US5544 is a fast setting, potting compound that has low viscosity therefore flows well and adheres well to many substrates. It has very low odor and does not contain TDE or mercury compounds. Formerly sold as Hysol® US5544. Information provided by Henkel.
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Physical Properties	Metric	English	Comments

Density	1.23 g/cc	0.0444 lb/in³	UA5544
	1.40 g/cc	0.0506 lb/in³	Mixed
	1.46 g/cc	0.0527 lb/in³	UB5544
Water Absorption	0.15 % @Time 86400 sec	0.15 % @Time 24.0 hour	Cured
Viscosity	75 cP	75 cP	UA5544
	2000 cP	2000 cP	Mixed
	11000 cP	11000 cP	UB5544

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	79 - 89	79 - 89
Tensile Strength	9.10 MPa	1320 psi

Electrical Properties	Metric	English	Comments
Volume Resistivity	3.60e+10 ohm-cm	3.60e+10 ohm-cm
Dielectric Constant	3.85 @Frequency 100000 Hz	3.85 @Frequency 100000 Hz
Dielectric Strength	>= 15.7 kV/mm	>= 400 kV/in
Dissipation Factor	0.020 @Frequency 100000 Hz	0.020 @Frequency 100000 Hz

Thermal Properties	Metric	English	Comments
CTE, linear	114 µm/m-°C @Temperature -40.0 - 25.0 °C	63.3 µin/in-°F @Temperature -40.0 - 77.0 °F
	155 µm/m-°C @Temperature 25.0 - 125 °C	86.1 µin/in-°F @Temperature 77.0 - 257 °F
Thermal Conductivity	0.335 W/m-K	2.32 BTU-in/hr-ft²-°F
Flammability, UL94	V-2 @Thickness 6.35 mm	V-2 @Thickness 0.250 in
	V-0 @Thickness 9.52 mm	V-0 @Thickness 0.375 in

Processing Properties	Metric	English	Comments
Cure Time	30.0 min @Temperature 60.0 - 85.0 °C	0.500 hour @Temperature 140 - 185 °F	Alternate
	120 - 240 min @Temperature 23.0 °C	2.00 - 4.00 hour @Temperature 73.4 °F	Normal
Working Life	2.00 - 3.00 min	2.00 - 3.00 min
Gel Time	4.00 - 6.00 min	4.00 - 6.00 min
Shelf Life	12.0 Month	12.0 Month	From date of manufacture

Descriptive Properties
Appearance	Clear Brown		UA5544
	Opaque White		Mixed
	Opaque White		UB5544
Mix Ratio, by Volume	1 : 4.81		UA5544 : UB5544
Mix Ratio, by Weight	15 : 85		UA5544 : UB5544
Weight Loss (%)	0.19		168 hrs. @ 130ºC

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PHENK7903 / 255394

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