Henkel Loctite® Stycast® 4640 Two-Component Silicone Rubber Syntactic Foam

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Henkel Loctite® Stycast® 4640 Two-Component Silicone Rubber Syntactic Foam
Categories:	Polymer; Thermoset; Silicone; Silicone, RTV, Encapsulation Grade
Material Notes:	Loctite Stycast 4640 provides the following product characteristics: Two component Lightweight Thermally conductive High temperature resistance Readily pourable Room temperature cure capability Cure: Room temperature cure or Heat cure Application: Potting or Encapsulant Loctite Stycast 4640 RTV condensation cure silicone rubber syntactic foam is engineered to yield a flexible, low density material with a low dielectric constant and dissipation factor. It is designed for airborne potting, sealing and caulking applications requiring low weight and excellent dielectric properties. Loctite Stycast 4640 can be used with Loctite CAT 50 AMB. Information provided by Henkel.
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Physical Properties	Metric	English	Comments

Density	0.750 g/cc	0.0271 lb/in³	Mixed
	0.750 g/cc	0.0271 lb/in³	Part A, Loctite Stycast 4640
Water Absorption	<= 0.10 % @Time 86400 sec	<= 0.10 % @Time 24.0 hour	Boil
Brookfield Viscosity	85 cP	85 cP	Part B, Loctite CAT 50 AMB
	45000 cP	45000 cP	Mixed
	45000 cP	45000 cP	Part A, Loctite Stycast 4640

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	70	70
Tensile Strength	1.40 MPa	203 psi
Elongation at Break	135 %	135 %

Electrical Properties	Metric	English	Comments
Volume Resistivity	>= 1.00e+14 ohm-cm	>= 1.00e+14 ohm-cm
Dielectric Constant	2.0 @Frequency 1e+6 Hz	2.0 @Frequency 1e+6 Hz
Dielectric Strength	9.84 kV/mm	250 kV/in
Dissipation Factor	0.0040 @Frequency 1e+6 Hz	0.0040 @Frequency 1e+6 Hz

Thermal Properties	Metric	English	Comments
Maximum Service Temperature, Air	260 °C	500 °F
Minimum Service Temperature, Air	-65.0 °C	-85.0 °F

Processing Properties	Metric	English	Comments
Cure Time	120 - 240 min @Temperature 65.0 °C	2.00 - 4.00 hour @Temperature 149 °F	Option 2. Post cure recommended for high temperature use.
	960 - 1440 min @Temperature 25.0 °C	16.0 - 24.0 hour @Temperature 77.0 °F	Option 1, Post cure recommended for high temperature use.
Working Life	60.0 min @Temperature 25.0 °C	60.0 min @Temperature 77.0 °F	100 g
Shelf Life	3.00 Month @Temperature 4.00 °C	3.00 Month @Temperature 39.2 °F	Part A, Loctite Stycast 4640

Descriptive Properties
Appearance	Clear Liquid		Part B, Loctite CAT 50 AMB
	White Liquid		Part A, Loctite Stycast 4640
Mix Ratio, by Weight	100 : 0.1 to 0.4		Material : Catalyst

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PHENK7939 / 255424

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