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	Original Value	Comments

Density	1.23 g/cc	UA5544
	1.40 g/cc	Mixed
	1.46 g/cc	UB5544
Water Absorption	0.15 % @Time 86400 sec	Cured
Viscosity	75 cP	UA5544
	2000 cP	Mixed
	11000 cP	UB5544

Mechanical Properties	Original Value	Comments
Hardness, Shore A	79 - 89
Tensile Strength	1320 psi

Electrical Properties	Original Value	Comments
Volume Resistivity	3.60e+10 ohm-cm
Dielectric Constant	3.85 @Frequency 100000 Hz
Dielectric Strength	>= 400 V/mil
Dissipation Factor	0.020 @Frequency 100000 Hz

Thermal Properties	Original Value	Comments
CTE, linear	114 µm/m-°C @Temperature -40.0 - 25.0 °C
	155 µm/m-°C @Temperature 25.0 - 125 °C
Thermal Conductivity	0.335 W/m-K
Flammability, UL94	V-2 @Thickness 6.35 mm
	V-0 @Thickness 9.52 mm

Processing Properties	Original Value	Comments
Cure Time	0.500 hour @Temperature 60.0 - 85.0 °C	Alternate
	2.00 - 4.00 hour @Temperature 23.0 °C	Normal
Working Life	2.00 - 3.00 min
Gel Time	4.00 - 6.00 min
Shelf Life	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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