Henkel Loctite® Stycast® US 5538 Two-Component Flexible, Unfilled Urethane Potting Compound

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Henkel Loctite® Stycast® US 5538 Two-Component Flexible, Unfilled Urethane Potting Compound
Categories:	Polymer; Thermoset; Polyurethane, TS
Material Notes:	Loctite Stycast US 5538 provides the following product characteristics: Room temperature cure Application: Potting and Encapsulating Loctite Stycast US 5538 is a flexible, unfilled, potting compound. This system provides low viscosity for good flow and good adhesion to many substrates. It is a low odor system designed to be friendly in the work environment. This material can be used to encapsulate load coils, transformers, etc. Sand can be added as an extender that increases thermal conductivity and decreases shrinkage and cost. Information provided by Henkel.
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Physical Properties	Original Value	Comments

Specific Gravity	0.970 g/cc	Part B
	1.24 g/cc	Part A
Density	1.06 g/cc	Mixed
Moisture Absorption	0.200 % @Time 86400 sec
Viscosity	55 cP	Part A
	450 cP	Mixed
	850 cP

Mechanical Properties	Original Value	Comments
Hardness, Shore A	65

Electrical Properties	Original Value	Comments
Volume Resistivity	1.60e+15 ohm-cm
Surface Resistance	3.10e+13 ohm
Dielectric Constant	3.2 @Frequency 100 Hz
Dielectric Strength	955 V/mil
Dissipation Factor	0.050 @Frequency 100 Hz

Thermal Properties	Original Value	Comments
Thermal Conductivity	0.180 W/m-K
Glass Transition Temp, Tg	-12.0 °C

Processing Properties	Original Value	Comments
Cure Time	1.00 - 3.00 hour @Temperature 60.0 - 85.0 °C	Alternate
	24.0 - 48.0 hour @Temperature 25.0 °C	Recommended
Working Life	20.0 - 40.0 min	105 g mass
Gel Time	45.0 - 75.0 min	105 gm mass

Descriptive Properties
Appearance	Black
Mix Ratio, by Volume	1 : 3.01	Part A : Part B
Mix Ratio, by Weight	30 : 70	Component A : Component B
Weight Loss (%)	0.005	Weight Loss after 168 hrs @ 125ºC

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PHENK7970 / 255454

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